PREAMBLE (NOT PART OF THE STANDARD)

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them.

END OF PREAMBLE (NOT PART OF THE STANDARD)

Errata

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2012 INTERNATIONAL FUEL GAS CODE®

A Member of the International Code Family®

Become a Building Safety Professional Member and Learn More about the Code Council

GO TO WWW.ICCSAFE.ORG for All Your Technical and Professional Needs Including:

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2012 International Fuel Gas Code®

First Printing: April 2011

ISBN: 978-1-60983-049-6 (soft-cover edition)
ISBN: 978-1-60983-048-9 (loose-leaf edition)

COPYRIGHT© 2011
by
INTERNATIONAL CODE COUNCIL, INC.

ALL RIGHTS RESERVED. This 2012 International Fuel Gas Code® is a copyrighted work owned by the International Code Council, Inc. Without advance written permission from the copyright owner, no part of this book may be reproduced, distributed, or transmitted in any form or by any means, including, without limitation, electronic, optical or mechanical means (by way of example, and not limitation, photocopying, or recording by or in an information storage retrieval system). For information on permission to copy material exceeding fair use, please contact: Publications, 4051 West Flossmoor Road, Country Club Hills, IL 60478. Phone 1-888-ICC-SAFE (422-7233).

Trademarks: “International Code Council,” the “International Code Council” logo and the “International Fuel Gas Code” are trademarks of the International Code Council, Inc.

Material designated IFGS
by
AMERICAN GAS ASSOCIATION
400 N. Capitol Street, N.W. • Washington, DC 20001
(202) 824-7000

Copyright © American Gas Association, 2011. All rights reserved.

PRINTED IN THE U.S.A.

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PREFACE

Introduction

Internationally, code officials recognize the need for a modern, up-to-date fuel gas code addressing the design and installation of fuel gas systems and gas-fired appliances through requirements emphasizing performance. The International Fuel Gas Code®, in this 2012 edition, is designed to meet these needs through model code regulations that safeguard the public health and safety in all communities, large and small.

This comprehensive fuel gas code establishes minimum regulations for fuel gas systems and gas-fired appliances using prescriptive and performance-related provisions. It is founded on broad-based principles that make possible the use of new materials and new fuel gas system and appliance designs. This 2012 edition is fully compatible with all of the International Codes® (l-Codes®) published by the International Code Council (ICC)®, including the International Building Code®, International Energy Conservation Code®, International Existing Building Code®, International Fire Code®, International Green Construction Code® (to be available March 2012), International Mechanical Code®, ICC Performance Code®, International Plumbing Code®, International Private Sewage Disposal Code®, International Property Maintenance Code®, International Residential Code®, International Swimming Pool and Spa Code® (to be available March 2012), International Wildland-Urban Interface Code® and International Zoning Code®.

The International Fuel Gas Code provisions provide many benefits, among which is the model code development process that offers an international forum for fuel gas technology professionals to discuss performance and prescriptive code requirements. This forum provides an excellent arena to debate proposed revisions. This model code also encourages international consistency in the application of provisions.

Development

The first edition of the International Fuel Gas Code (1997) was the culmination of an effort initiated in 1996 by a development committee appointed by ICC and consisting of representatives of the three statutory members of the International Code Council at that time, including: Building Officials and Code Administrators International, Inc. (BOCA), International Conference of Building Officials (ICBO) and Southern Building Code Congress International (SBCCI) and the gas industry. The intent was to draft a comprehensive set of regulations for fuel gas systems and gas-fired appliances consistent with and inclusive of the scope of the existing mechanical, plumbing and gas codes. Technical content of the latest model codes promulgated by BOCA, ICBO, SBCCI and ICC and the National Fuel Gas Code (ANSI Z223.1) was utilized as the basis for the development. This 2012 edition presents the code as originally issued, with changes reflected in subsequent editions through 2009, and with code changes approved through the ICC Code Development Process through 2010 and standard revisions correlated with ANSI Z223.1-2012. A new edition such as this is promulgated every three years.

This code is founded on principles intended to establish provisions consistent with the scope of a fuel gas code that adequately protects public health, safety and welfare; provisions that do not unnecessarily increase construction costs; provisions that do not restrict the use of new materials, products or methods of construction; and provisions that do not give preferential treatment to particular types or classes of materials, products or methods of construction.

Format

The International Fuel Gas Code is segregated by section numbers into two categories - “code” and “standard” - all coordinated and incorporated into a single document. The sections that are “code” are designated by the acronym “IFGC” next to the main section number (e.g., Section 101). The sections that are “standard” are designated by the acronym “IFGS” next to the main section number (e.g., Section 304). A subsection may be individually redesignated as an “IFGS” section where it is located under an “IFGC” main section.

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Adoption

The International Fuel Gas Code is available for adoption and use by jurisdictions internationally. Its use within a governmental jurisdiction is intended to be accomplished through adoption by reference in accordance with proceedings establishing the jurisdiction’s laws. At the time of adoption, jurisdictions should insert the appropriate information in provisions requiring specific local information, such as the name of the adopting jurisdiction. These locations are shown in bracketed words in small capital letters in the code and in the sample ordinance. The sample adoption ordinance on page ix addresses several key elements of a code adoption ordinance, including the information required for insertion into the code text.

Maintenance

The International Fuel Gas Code is kept up to date through the review of proposed changes submitted by code enforcing officials, industry representatives, design professionals and other interested parties. Proposed changes are carefully considered through an open code development process in which all interested and affected parties may participate. The code development process of the International Fuel Gas Code is slightly different than the process for the other International Codes.

Proposed changes to text designated “IFGC” are subject to the ICC Code Development Process. For more information regarding the code development process, contact the Codes and Standards Development Department of the International Code Council.

Proposed changes to text designated as “IFGS” are subject to the standards development process which maintains the National Fuel Gas Code (ANSI Z223.1). For more information regarding the standards development process, contact the American Gas Association (AGA) at 400 N. Capitol Street, N.W., Washington, DC 20001.

While the development procedure of the International Fuel Gas Code ensures the highest degree of care, the ICC, its members, the AGA and those participating in the development of this code do not accept any liability resulting from compliance or noncompliance with the provisions because the ICC, its founding members and the AGA do not have the power or authority to police or enforce compliance with the contents of this code. Only the governmental body that enacts the code into law has such authority.

Code Development Committee Responsibilities (Letter Designations in Front of Section Numbers)

In each code development cycle, proposed changes to the code are considered at the Code Development Hearings by the International Fuel Gas Code Development Committee, whose action constitutes a recommendation to the voting membership for final action on the proposed change. Proposed changes to a code section that has a number beginning with a letter in brackets are considered by a different code development committee. For example, proposed changes to code sections that have [B] in front of them (e.g., [B] 302.1) are considered by the appropriate International Building Code Development Committee (IBC-Structural) at the code development hearings.

The content of sections in this code that begin with a letter designation is maintained by another code development committee in accordance with the following:

[A] = Administrative Code Development Committee;

[B] = International Building Code Development Committee (IBC—Fire Safety, General, Means of Egress or Structural);

[M] = International Mechanical Code Development Committee; and

[F] = International Fire Code Development Committee.

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Note that, for the development of the 2015 edition of the l-Codes, there will be two groups of code development committees and they will meet in separate years. The groupings are as follows:

Group A Codes (Heard in 2012, Code Change Proposals Deadline: January 3,2012) Group B Codes (Heard in 2013, Code Change Proposals Deadline: January 3, 2013)
International Building Code Administrative Provisions (Chapter 1 all codes except IRC and ICCPC, administrative updates to currently referenced standards, and designated definitions)
International Fuel Gas Code International Energy Conservation Code
International Mechanical Code International Existing Building Code
International Plumbing Code International Fire Code
International Private Sewage Disposal Code International Green Construction Code
  ICC Performance Code
  International Property Maintenance Code
  International Residential Code
  International Swimming Pool and Spa Code
  International Wildland-Urban Interface Code
  International Zoning Code

Code change proposals submitted for code sections that have a letter designation in front of them will be heard by the respective committee responsible for such code sections. Because different committees will meet in different years, it is possible that some proposals for this code will be heard by a committee in a different year than the year in which the primary committee for this code meets.

For example, every section of Chapter 1 of this code is designated as the responsibility of the Administrative Code Development Committee, and that committee is part of the Group B code hearings. This committee will conduct its code development hearing in 2013 to consider all code change proposals for Chapter 1 of this code and proposals for Chapter 1 of all l-Codes. Therefore, any proposals received for Chapter 1 of this code will be deferred for consideration in 2013 by the Administrative Code Development Committee.

Another example is Section 707 of this code which is designated as the responsibility of the International Fire Code Development Committee. This committee will conduct its code development hearing in 2013 to consider code change proposals in its purview, which includes any proposals to Section 707.

In some cases, another committee in Group A will be responsible for a section of this code. For example, Section 306.1 has a [M] in front of the numbered section, indicating that this section of the code is the responsibility of the International Mechanical Code Development Committee. The International Mechanical Code is in Group A; therefore, any code change proposals to this section will be due before the Group A deadline of January 3, 2012, and these code change proposals will be assigned to the International Mechanical Code Development Committee for consideration.

It is very important that anyone submitting code change proposals understand which code development committee is responsible for the section of the code that is the subject of the code change proposal. For further information on the code development committee responsibilities, please visit the ICC web site at www.iccsafe.org/scoping.

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Marginal Markings

Solid vertical lines in the margins within the body of the code indicate a technical change from the requirements of the 2009 edition. Deletion indicators in the form of an arrow (Image) are provided in the margin where an entire section, paragraph, exception or table has been deleted or an item in a list of items or in a table has been deleted.

Italicized Terms

Selected terms set forth in Chapter 2, Definitions, are italicized where they appear in code text. Such terms are not italicized where the definition set forth in Chapter 2 does not impart the intended meaning in the use of the term. The terms selected have definitions which the user should read carefully to facilitate better understanding of the code.

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Effective Use of the International Fuel Gas Code

The IFGC is a model code that regulates the design and installation of fuel gas distribution piping and systems, appliances, appliance venting systems, combustion air provisions, gaseous hydrogen systems and motor vehicle gaseous-fuel-dispensing stations. The definition of fuel gas includes natural, liquefied petroleum and manufactured gases and mixtures of these gases.

The purpose of the code is to establish the minimum acceptable level of safety and to protect life and property from the potential dangers associated with the storage, distribution and usage of fuel gases and the byproducts of combustion of such fuels. The code also protects the personnel that install, maintain, service and replace the systems and appliances addressed by this code.

With the exception of Section 401.1.1, the IFGC does not address utility-owned piping and equipment (i.e., anything upstream of the point of delivery). See the definition of “Point of delivery” and Section 501.8 for other code coverage exemptions.

The IFGC is primarily a specification-oriented (prescriptive) code with some performance-oriented text. For example, Section 503.3.1 is a performance statement, but Chapter 5 contains prescriptive requirements that will cause Section 503.3.1 to be satisfied.

The IFGC applies to all occupancies including one- and two-family dwellings and townhouses. The IRC is referenced for coverage of one- and two-family dwellings and townhouses; however, in effect, the IFGC provisions are still applicable because the fuel gas chapter in the IRC (Chapter 24) is composed entirely of text extracted from the IFGC. Therefore, whether using the IFGC or the IRC, the fuel gas provisions will be identical. The IFGC does not apply to piping systems that operate at pressures in excess of 125 psig for natural gas and 20 psig for LP-gas (note exception in Section 402.6).

The general Section 105.2 and the specific Sections 304.8, 402.3, 503.5.5 and 503.6.9 allow combustion air provisions, pipe sizing and chimney and vent sizing to be performed by approved engineering methods as alternatives to the prescriptive methods in the code.

Arrangement and Format of the 2009 IFGC

The format of the IFGC allows each chapter to be devoted to a particular subject, with the exception of Chapter 3, which contains general subject matters that are not extensive enough to warrant their own independent chapter.

Chapter 1 Scope and Administration. Chapter 1 establishes the limits of applicability of the code and describes how the code is to be applied and enforced. A fuel gas code, like any other code, is intended to be adopted as a legally enforceable document, and it cannot be effective without adequate provisions for its administration and enforcement. The provisions of Chapter 1 establish the authority and duties of the code official appointed by the jurisdiction having authority and also establish the rights and privileges of the design professional, contractor and property owner.

Chapter 2 Definitions. Chapter 2 is the repository of the definitions of terms used in the body of the code. Codes are technical documents and every word, term and punctuation mark can impact the meaning of the code text and the intended results. The code often uses terms that have a unique meaning in the code and the code meaning can differ substantially from the ordinarily understood meaning of the term as used outside of the code.

The terms defined in Chapter 2 are deemed to be of prime importance in establishing the meaning and intent of the code text that uses the terms. The user of the code should be familiar with and consult this chapter because the definitions are essential to the correct interpretation of the code and because the user may not be aware that a term is defined.

Chapter 3 General Regulations. Chapter 3 contains broadly applicable requirements related to appliance location and installation, appliance and systems access, protection of structural elements and clearances to combustibles, among others. This chapter also covers combustion air provisions for gas-fired appliances.

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Chapter 4 Gas Piping Installations. Chapter 4 covers the allowable materials for gas piping systems and the sizing and installation of such systems. It also covers pressure regulators, appliance connections and overpressure protection devices. Gas piping systems are sized to supply the maximum demand while maintaining the supply pressure necessary for safe operation of the appliances served.

Chapter 5 Chimneys and Vents. Chapter 5 regulates the design, construction, installation, maintenance, repair and approval of chimneys, vents, venting systems and their connections to gas-fired appliances. Properly designed chimneys, vents and venting systems are necessary to conduct to the outdoors the flue gases produced by the combustion of fuels in appliances. The provisions of this chapter are intended to minimize the hazards associated with high temperatures and potentially toxic and corrosive combustion gases. This chapter addresses all of the factory-built and site-built chimneys, vents and venting systems used to vent all types and categories of appliances. It also addresses direct-vent appliances, integral vent appliances, side-wall mechanically vented appliances and exhaust hoods that convey the combustion byproducts from cooking and other process appliances.

Chapter 6 Specific Appliances. Chapter 6 addresses specific appliances that the code intends to regulate. Each main section applies to a unique type of gas-fired appliance and specifies the product standards to which the appliance must be listed. The general requirements found in the previous Chapters 1 through 5 also apply and the sections in Chapter 6 add the special requirements that are specific to each type of appliance.

Chapter 7 Gaseous Hydrogen Systems. Chapter 7 is specific to gaseous hydrogen generation, storage, distribution and utilization systems, appliances and equipment. Note that hydrogen is not within the definition of “Fuel gas,” but it is, nonetheless, commonly used as a fuel for fuel-cell power generation and fuel-cell powered motor vehicles. The scope of Chapter 7 is not limited to any particular use of hydrogen (see Sections 633 and 635). Hydrogen systems have unique potential hazards because of the specific gravity of the gas, its chemical effect on materials and the fact that it is not odorized.

Chapter 8 Referenced Standards. Chapter 8 lists all of the product and installation standards and codes that are referenced throughout Chapters 1 through 7. As stated in Section 102.8, these standards and codes become an enforceable part of the code (to the prescribed extent of the reference) as if printed in the body of the code. Chapter 8 provides the full title and edition year of the standards and codes in addition to the address of the promulgators and the section numbers in which the standards and codes are referenced.

Appendix A Sizing and Capacities of Gas Piping. This appendix is informative and not part of the code. It provides design guidance, useful facts and data and multiple examples of how to apply the sizing tables and sizing methodologies of Chapter 4.

Appendix B Sizing of Venting Systems Serving Appliances Equipped with Draft Hoods, Category I Appliances and Appliances Listed for Use with Type B Vents. This appendix is informative and not part of the code. It contains multiple examples of how to apply the vent and chimney tables and methodologies of Chapter 5.

Appendix C Exit Terminals of Mechanical Draft and Direct-vent Venting Systems. This appendix is informative and not part of the code. It consists of a figure and notes that visually depict code requirements from Chapter 5 for vent terminals with respect to the openings found in building exterior walls.

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation. This appendix is informative and not part of the code. It provides recommended procedures for testing and inspecting an appliance installation to determine if the installation is operating safely and if the appliance is in a safe condition.

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LEGISLATION

The International Codes are designed and promulgated to be adopted by reference by legislative action. Jurisdictions wishing to adopt the 2012 International Fuel Gas Code as an enforceable regulation governing fuel gas systems and gas-fired appliances should ensure that certain factual information is included in the adopting legislation at the time adoption is being considered by the appropriate governmental body. The following sample adoption legislation addresses several key elements, including the information required for insertion into the code text.

SAMPLE LEGISLATION FOR ADOPTION OF THE
INTERNATIONAL FUEL GAS CODE
ORDINANCE NO.__________

A[N] [ORDINANCE/STATUTE/REGULATION] of the [JURISDICTION] adopting the 2012 edition of the International Fuel Gas Code, regulating and governing fuel gas systems and gas-fired appliances in the [JURISDICTION]; providing for the issuance of permits and collection of fees therefor; repealing [ORDINANCE/STATUTE/REGULATION] No. _____ of the [JURISDICTION] and all other ordinances or parts of laws in conflict therewith.

The [GOVERNING BODY] of the [JURISDICTION] does ordain as follows:

Section 1. That a certain document, three (3) copies of which are on file in the office of the [TITLE OF JURISDICTION’S KEEPER OF RECORDS] of [NAME OF JURISDICTION], being marked and designated as the International Fuel Gas Code, 2012 edition, including Appendix Chapters [FILL IN THE APPENDIX CHAPTERS BEING ADOPTED] (see International Fuel Gas Code Section 101.3, 2012 edition), as published by the International Code Council, be and is hereby adopted as the Fuel Gas Code of the [JURISDICTION], in the State of [STATE NAME] for regulating and governing fuel gas systems and gas-fired appliances as herein provided; providing for the issuance of permits and collection of fees therefor; and each and all of the regulations, provisions, penalties, conditions and terms of said Fuel Gas Code on file in the office of the [JURISDICTION] are hereby referred to, adopted, and made a part hereof, as if fully set out in this legislation, with the additions, insertions, deletions and changes, if any, prescribed in Section 2 of this ordinance.

Section 2. The following sections are hereby revised:

Section 101.1. Insert: [NAME OF JURISDICTION]

Section 106.6.2. Insert: [APPROPRIATE SCHEDULE]

Section 106.6.3. Insert: [PERCENTAGES IN TWO LOCATIONS]

Section 108.4. Insert: [SPECIFY OFFENSE] [AMOUNT] [NUMBER OF DAYS]

Section 108.5. Insert: [AMOUNTS IN TWO LOCATIONS]

Section 3. That [ORDINANCE/STATUTE/REGULATION] No. _____ of [JURISDICTION] entitled [FILL IN HERE THE COMPLETE TITLE OF THE LEGISLATION OR LAWS IN EFFECT AT THE PRESENT TIME SO THAT THEY WILL BE REPEALED BY DEFINITE MENTION] and all other ordinances or parts of laws in conflict herewith are hereby repealed.

Section 4. That if any section, subsection, sentence, clause or phrase of this legislation is, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this ordinance. The [GOVERNING BODY] hereby declares that it would have passed this law, and each section, subsection, clause or phrase thereof, irrespective of the fact that any one or more sections, subsections, sentences, clauses and phrases be declared unconstitutional.

Section 5. That nothing in this legislation or in the Fuel Gas Code hereby adopted shall be construed to affect any suit or proceeding impending in any court, or any rights acquired, or liability incurred, or any cause or causes of action acquired or existing, under any act or ordinance hereby repealed as cited in Section 3 of this law; nor shall any just or legal right or remedy of any character be lost, impaired or affected by this legislation.

Section 6. That the [JURISDICTION’S KEEPER OF RECORDS] is hereby ordered and directed to cause this legislation to be published. (An additional provision may be required to direct the number of times the legislation is to be published and to specify that it is to be in a newspaper in general circulation. Posting may also be required.)

Section 7. That this law and the rules, regulations, provisions, requirements, orders and matters established and adopted hereby shall take effect and be in full force and effect [TIME PERIOD] from and after the date of its final passage and adoption.

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TABLE OF CONTENTS

CHAPTER 1 SCOPE AND ADMINISTRATION 1
PART 1—SCOPE AND APPLICATION  
Section
101 General (IFGC) 1
102 Applicability (IFGC) 2
PART 2—ADMINISTRATION AND ENFORCEMENT 2
103 Department of Inspection (IFGC) 2
104 Duties and Powers of the Code Official (IFGC) 3
105 Approval (IFGC) 3
106 Permits (IFGC) 4
107 Inspections and Testing (IFGC) 5
108 Violations (IFGC) 7
109 Means of Appeal (IFGC) 7
110 Temporary Equipment, Systems and Uses (IFGC) 8
CHAPTER 2 DEFINITIONS 9
Section
201 General (IFGC) 9
202 General Definitions (IFGC) 9
CHAPTER 3 GENERAL REGULATIONS 17
Section
301 General (IFGC) 17
302 Structural Safety (IFGC) 18
303 Appliance Location (IFGC) 18
304 Combustion, Ventilation and Dilution Air (IFGS) 19
305 Installation (IFGC) 22
306 Access and Service Space (IFGC) 23
307 Condensate Disposal (IFGC) 25
308 Clearance Reduction (IFGS) 25
309 Electrical (IFGC) 26
310 Electrical Bonding (IFGS) 28
CHAPTER 4 GAS PIPING INSTALLATIONS 29
Section
401 General (IFGC) 29
402 Pipe Sizing (IFGS) 29
403 Piping Materials (IFGS) 67
404 Piping System Installation (IFGC) 69
405 Piping Bends and Changes in Direction (IFGS) 71
406 Inspection, Testing and Purging (IFGS) 71
407 Piping Support (IFGC) 74
408 Drips and Sloped Piping (IFGC) 74
409 Shutoff Valves (IFGC) 74
410 Flow Controls (IFGC) 75
411 Appliance and Manufactured Home Connections (IFGC) 76
412 Liquefied Petroleum Gas Motor Vehicle Fuel-dispensing Facilities (IFGC) 77
413 Compressed Natural Gas Motor Vehicle Fuel-dispensing Facilities (IFGC) 77
414 Supplemental and Standby Gas Supply (IFGC) 79
415 Piping Support Intervals (IFGS) 79
416 Overpressure Protection Devices (IFGS) 79
CHAPTER 5 CHIMNEYS AND VENTS 83
Section
501 General (IFGC) 83
502 Vents (IFGC) 84
503 Venting of Appliances (IFGC) 85
504 Sizing of Category I Appliance Venting Systems (IFGS) 94
505 Direct-vent, Integral Vent, Mechanical Vent and Ventilation/Exhaust Hood Venting (IFGC) 98
506 Factory-built Chimneys (IFGC) 98
CHAPTER 6 SPECIFIC APPLIANCES 119
Section
601 General (IFGC) 119
602 Decorative Appliances for Installation in Fireplaces (IFGC) 119
603 Log Lighters (IFGC) 119
604 Vented Gas Fireplaces (Decorative Appliances) (IFGC) 119
605 Vented Gas Fireplace Heaters (IFGC) 119
606 Incinerators and Crematories (IFGC) 119
607 Commercial-industrial Incinerators (IFGC) 119
608 Vented Wall Furnaces (IFGC) 119 xi
609 Floor Furnaces (IFGC) 120
610 Duct Furnaces (IFGC) 120
611 Nonrecirculating Direct-fired Industrial Air Heaters (IFGC) 120
612 Recirculating Direct-fired Industrial Air Heaters (IFGC) 121
613 Clothes Dryers (IFGC) 121
614 Clothes Dryer Exhaust (IFGC) 121
615 Sauna Heaters (IFGC) 123
616 Engine and Gas Turbine-powered Equipment (IFGC) 123
617 Pool and Spa Heaters (IFGC) 124
618 Forced-air Warm-air Furnaces (IFGC) 124
619 Conversion Burners (IFGC) 125
620 Unit Heaters (IFGC) 125
621 Unvented Room Heaters (IFGC) 125
622 Vented Room Heaters (IFGC) 125
623 Cooking Appliances (IFGC) 125
624 Water Heaters (IFGC) 126
625 Refrigerators (IFGC) 126
626 Gas-fired Toilets (IFGC) 126
627 Air-conditioning Appliances (IFGC) 126
628 Illuminating Appliances (IFGC) 127
629 Small Ceramic Kilns (IFGC) 127
630 Infrared Radiant Heaters (IFGC) 128
631 Boilers (IFGC) 128
632 Equipment Installed in Existing Unlisted Boilers (IFGC) 128
633 Stationary Fuel-cell Power Systems (IFGC) 128
634 Chimney Damper Opening Area (IFGS) 128
635 Gaseous Hydrogen Systems (IFGC) 128
636 Outdoor Decorative Appliances (IFGC) 128
CHAPTER 7 GASEOUS HYDROGEN SYSTEMS 129
Section
701 General (IFGC) 129
702 General Definitions (IFGC) 129
703 General Requirements (IFGC) 129
704 Piping, Use and Handling (IFGC) 130
705 Testing of Hydrogen Piping Systems (IFGC) 131
706 Location of Gaseous Hydrogen Systems (IFGC) 132
707 Operation and Maintenance of Gaseous Hydrogen Systems (IFGC) 133
708 Design of Liquefied Hydrogen Systems Associated with Hydrogen Vaporization Operations (IFGC) 133
CHAPTER 8 REFERENCED STANDARDS 135
APPENDIX A SIZING AND CAPACITIES OF GAS PIPING (IFGS) 139
APPENDIX B SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS (IFGS) 151
APPENDIX C EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS (IFGS) 161
APPENDIX D RECOMMENDED PROCEDURE FOR SAFETY INSPECTION OF AN EXISTING APPLIANCE INSTALLATION (IFGS) 163
INDEX 165 xii

CHAPTER 1
SCOPE AND ADMINISTRATION

PART 1—SCOPE AND APPLICATION

SECTION 101 (IFGC) GENERAL

[A] 101.1 Title. These regulations shall be known as the Fuel Gas Code of [NAME OF JURISDICTION], hereinafter referred to as “this code.”

[A] 101.2 Scope. This code shall apply to the installation of fuel-gas piping systems, fuel gas appliances, gaseous hydrogen systems and related accessories in accordance with Sections 101.2.1 through 101.2.5.

Exception: Detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress and their accessory structures shall comply with the International Residential Code.

[A] 101.2.1 Gaseous hydrogen systems. Gaseous hydrogen systems shall be regulated by Chapter 7.

[A] 101.2.2 Piping systems. These regulations cover piping systems for natural gas with an operating pressure of 125 pounds per square inch gauge (psig) (862 kPa gauge) or less, and for LP-gas with an operating pressure of 20 psig (140 kPa gauge) or less, except as provided in Section 402.6. Coverage shall extend from the point of delivery to the outlet of the appliance shutoff valves. Piping system requirements shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance.

[A] 101.2.3 Gas appliances. Requirements for gas appliances and related accessories shall include installation, combustion and ventilation air and venting and connections to piping systems.

[A] 101.2.4 Systems, appliances and equipment outside the scope. This code shall not apply to the following:

  1. Portable LP-gas appliances and equipment of all types that is not connected to a fixed fuel piping system.
  2. Installation of farm appliances and equipment such as brooders, dehydrators, dryers and irrigation equipment.
  3. Raw material (feedstock) applications except for piping to special atmosphere generators.
  4. Oxygen-fuel gas cutting and welding systems.
  5. Industrial gas applications using gases such as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen and nitrogen.
  6. Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms and natural gas processing plants.
  7. Integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by, or used in, chemical reactions.
  8. LP-gas installations at utility gas plants.
  9. Liquefied natural gas (LNG) installations.
  10. Fuel gas piping in power and atomic energy plants.
  11. Proprietary items of equipment, apparatus or instruments such as gas-generating sets, compressors and calorimeters.
  12. LP-gas equipment for vaporization, gas mixing and gas manufacturing.
  13. Temporary LP-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.
  14. Installation of LP-gas systems for railroad switch heating.
  15. Installation of hydrogen gas, LP-gas and compressed natural gas (CNG) systems on vehicles.
  16. Except as provided in Section 401.1.1, gas piping, meters, gas pressure regulators and other appurtenances used by the serving gas supplier in the distribution of gas, other than undiluted LP-gas.
  17. Building design and construction, except as specified herein.
  18. Piping systems for mixtures of gas and air within the flammable range with an operating pressure greater than 10 psig (69 kPa gauge).
  19. Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.

[A] 101.2.5 Other fuels. The requirements for the design, installation, maintenance, alteration and inspection of mechanical systems operating with fuels other than fuel gas shall be regulated by the International Mechanical Code.

[A] 101.3 Appendices. Provisions in the appendices shall not apply unless specifically adopted.

[A] 101.4 Intent. The purpose of this code is to provide minimum standards to safeguard life or limb, health, property and public welfare by regulating and controlling the design, construction, installation, quality of materials, location, operation and maintenance or use of fuel gas systems.

[A] 101.5 Severability. If a section, subsection, sentence, clause or phrase of this code is, for any reason, held to be unconstitutional, such decision shall not affect the validity of the remaining portions of this code.

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SECTION 102 (IFGC)
APPLICABILITY

[A] 102.1 General. Where there is a conflict between a general requirement and a specific requirement, the specific requirement shall govern. Where, in a specific case, different sections of this code specify different materials, methods of construction or other requirements, the most restrictive shall govern.

[A] 102.2 Existing installations. Except as otherwise provided for in this chapter, a provision in this code shall not require the removal, alteration or abandonment of, nor prevent the continued utilization and maintenance of, existing installations lawfully in existence at the time of the adoption of this code.

[A] 102.2.1 Existing buildings. Additions, alterations, renovations or repairs related to building or structural issues shall be regulated by the International Building Code.

[A] 102.3 Maintenance. Installations, both existing and new, and parts thereof shall be maintained in proper operating condition in accordance with the original design and in a safe condition. Devices or safeguards which are required by this code shall be maintained in compliance with the code edition under which they were installed. The owner or the owner’s designated agent shall be responsible for maintenance of installations. To determine compliance with this provision, the code official shall have the authority to require an installation to be reinspected.

[A] 102.4 Additions, alterations or repairs. Additions, alterations, renovations or repairs to installations shall conform to that required for new installations without requiring the existing installation to comply with all of the requirements of this code. Additions, alterations or repairs shall not cause an existing installation to become unsafe, hazardous or overloaded.

Minor additions, alterations, renovations and repairs to existing installations shall meet the provisions for new construction, unless such work is done in the same manner and arrangement as was in the existing system, is not hazardous and is approved.

[A] 102.5 Change in occupancy. It shall be unlawful to make a change in the occupancy of a structure which will subject the structure to the special provisions of this code applicable to the new occupancy without approval. The code official shall certify that such structure meets the intent of the provisions of law governing building construction for the proposed new occupancy and that such change of occupancy does not result in any hazard to the public health, safety or welfare.

[A] 102.6 Historic buildings. The provisions of this code relating to the construction, alteration, repair, enlargement, restoration, relocation or moving of buildings or structures shall not be mandatory for existing buildings or structures identified and classified by the state or local jurisdiction as historic buildings when such buildings or structures are judged by the code official to be safe and in the public interest of health, safety and welfare regarding any proposed construction, alteration, repair, enlargement, restoration, relocation or moving of buildings.

[A] 102.7 Moved buildings. Except as determined by Section 102.2, installations that are a part of buildings or structures moved into or within the jurisdiction shall comply with the provisions of this code for new installations.

[A] 102.8 Referenced codes and standards. The codes and standards referenced in this code shall be those that are listed in Chapter 8 and such codes and standards shall be considered as part of the requirements of this code to the prescribed extent of each such reference and as further regulated in Sections 102.8.1 and 102.8.2.

Exception: Where enforcement of a code provision would violate the conditions of the listing of the equipment or appliance, the conditions of the listing and the manufacturer’s installation instructions shall apply.

[A] 102.8.1 Conflicts. Where conflicts occur between the provisions of this code and the referenced standards, the provisions of this code shall apply.

[A] 102.8.2 Provisions in referenced codes and standards. Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of this code, the provisions of this code, as applicable, shall take precedence over the provisions in the referenced code or standard.

[A] 102.9 Requirements not covered by code. Requirements necessary for the strength, stability or proper operation of an existing or proposed installation, or for the public safety, health and general welfare, not specifically covered by this code, shall be determined by the code official.

[A] 102.10 Other laws. The provisions of this code shall not be deemed to nullify any provisions of local, state or federal law.

[A] 102.11 Application of references. Reference to chapter section numbers, or to provisions not specifically identified by number, shall be construed to refer to such chapter, section or provision of this code.

PART 2—ADMINISTRATION AND ENFORCEMENT

SECTION 103 (IFGC)
DEPARTMENT OF INSPECTION

[A] 103.1 General. The Department of Inspection is hereby created and the executive official in charge thereof shall be known as the code official.

[A] 103.2 Appointment. The code official shall be appointed by the chief appointing authority of the jurisdiction.

[A] 103.3 Deputies. In accordance with the prescribed procedures of this jurisdiction and with the concurrence of the appointing authority, the code official shall have the authority to appoint a deputy code official, other related technical officers, inspectors and other employees. Such employees shall have powers as delegated by the code official.

[A] 103.4 Liability. The code official, member of the board of appeals or employee charged with the enforcement of this code, while acting for the jurisdiction in good faith and without malice in the discharge of the duties required by this code or other pertinent law or ordinance, shall not thereby be rendered

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liable personally, and is hereby relieved from all personal liability for any damage accruing to persons or property as a result of an act or by reason of an act or omission in the discharge of official duties.

Any suit instituted against any officer or employee because of an act performed by that officer or employee in the lawful discharge of duties and under the provisions of this code shall be defended by the legal representative of the jurisdiction until the final termination of the proceedings. The code official or any subordinate shall not be liable for costs in an action, suit or proceeding that is instituted in pursuance of the provisions of this code.

SECTION 104 (IFGC)
DUTIES AND POWERS OF THE CODE OFFICIAL

[A] 104.1 General. The code official is hereby authorized and directed to enforce the provisions of this code. The code official shall have the authority to render interpretations of this code and to adopt policies and procedures in order to clarify the application of its provisions. Such interpretations, policies and procedures shall be in compliance with the intent and purpose of this code. Such policies and procedures shall not have the effect of waiving requirements specifically provided in this code.

[A] 104.2 Applications and permits. The code official shall receive applications, review construction documents and issue permits for installations and alterations of fuel gas systems, inspect the premises for which such permits have been issued and enforce compliance with the provisions of this code.

[A] 104.3 Inspections. The code official shall make all of the required inspections, or shall accept reports of inspection by approved agencies or individuals. All reports of such inspections shall be in writing and shall be certified by a responsible officer of such approved agency or by the responsible individual. The code official is authorized to engage such expert opinion as deemed necessary to report upon unusual technical issues that arise, subject to the approval of the appointing authority.

[A] 104.4 Right of entry. Whenever it is necessary to make an inspection to enforce the provisions of this code, or whenever the code official has reasonable cause to believe that there exists in a building or upon any premises any conditions or violations of this code that make the building or premises unsafe, dangerous or hazardous, the code official shall have the authority to enter the building or premises at all reasonable times to inspect or to perform the duties imposed upon the code official by this code. If such building or premises is occupied, the code official shall present credentials to the occupant and request entry. If such building or premises is unoccupied, the code official shall first make a reasonable effort to locate the owner or other person having charge or control of the building or premises and request entry. If entry is refused, the code official has recourse to every remedy provided by law to secure entry.

When the code official has first obtained a proper inspection warrant or other remedy provided by law to secure entry, an owner or occupant or person having charge, care or control of the building or premises shall not fail or neglect, after proper request is made as herein provided, to promptly permit entry therein by the code official for the purpose of inspection and examination pursuant to this code.

[A] 104.5 Identification. The code official shall carry proper identification when inspecting structures or premises in the performance of duties under this code.

[A] 104.6 Notices and orders. The code official shall issue all necessary notices or orders to ensure compliance with this code.

[A] 104.7 Department records. The code official shall keep official records of applications received, permits and certificates issued, fees collected, reports of inspections and notices and orders issued. Such records shall be retained in the official records for the period required for the retention of public records.

SECTION 105 (IFGC)
APPROVAL

[A] 105.1 Modifications. Whenever there are practical difficulties involved in carrying out the provisions of this code, the code official shall have the authority to grant modifications for individual cases, upon application of the owner or owner’s representative, provided that the code official shall first find that special individual reason makes the strict letter of this code impractical and that such modification is in compliance with the intent and purpose of this code and does not lessen health, life and fire safety requirements. The details of action granting modifications shall be recorded and entered in the files of the Department of Inspection.

[A] 105.2 Alternative materials, methods, appliances and equipment. The provisions of this code are not intended to prevent the installation of any material or to prohibit any method of construction not specifically prescribed by this code, provided that any such alternative has been approved. An alternative material or method of construction shall be approved where the code official finds that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, at least the equivalent of that prescribed in this code in quality, strength, effectiveness, fire resistance, durability and safety.

[A] 105.2.1 Research reports. Supporting data, where necessary to assist in the approval of materials or assemblies not specifically provided for in this code, shall consist of valid research reports from approved sources.

[A] 105.3 Required testing. Whenever there is insufficient evidence of compliance with the provisions of this code, evidence that a material or method does not conform to the requirements of this code, or in order to substantiate claims for alternative materials or methods, the code official shall have the authority to require tests as evidence of compliance to be made at no expense to the jurisdiction.

[A] 105.3.1 Test methods. Test methods shall be as specified in this code or by other recognized test standards. In

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the absence of recognized and accepted test methods, the code official shall approve the testing procedures.

[A] 105.3.2 Testing agency. All tests shall be performed by an approved agency.

[A] 105.3.3 Test reports. Reports of tests shall be retained by the code official for the period required for retention of public records.

[A] 105.4 Used material, appliances and equipment. The use of used materials which meet the requirements of this code for new materials is permitted. Used appliances, equipment and devices shall not be reused unless such elements have been reconditioned, tested and placed in good and proper working condition, and approved by the code official.

[A] 105.5 Approved materials and equipment. Materials, equipment and devices approved by the code official shall be constructed and installed in accordance with such approval.

SECTION 106 (IFGC)
PERMITS

[A] 106.1 Where required. An owner, authorized agent or contractor who desires to erect, install, enlarge, alter, repair, remove, convert or replace an installation regulated by this code, or to cause such work to be done, shall first make application to the code official and obtain the required permit for the work.

Exception: Where appliance and equipment replacements and repairs are required to be performed in an emergency situation, the permit application shall be submitted within the next working business day of the Department of Inspection.

[A] 106.2 Permits not required. Permits shall not be required for the following:

  1. Any portable heating appliance.
  2. Replacement of any minor component of an appliance or equipment that does not alter approval of such appliance or equipment or make such appliance or equipment unsafe.

Exemption from the permit requirements of this code shall not be deemed to grant authorization for work to be done in violation of the provisions of this code or of other laws or ordinances of this jurisdiction.

[A] 106.3 Application for permit. Each application for a permit, with the required fee, shall be filed with the code official on a form furnished for that purpose and shall contain a general description of the proposed work and its location. The application shall be signed by the owner or an authorized agent. The permit application shall indicate the proposed occupancy of all parts of the building and of that portion of the site or lot, if any, not covered by the building or structure and shall contain such other information required by the code official.

[A] 106.3.1 Construction documents. Construction documents, engineering calculations, diagrams and other data shall be submitted in two or more sets with each application for a permit. The code official shall require construction documents, computations and specifications to be prepared and designed by a registered design professional when required by state law. Construction documents shall be drawn to scale and shall be of sufficient clarity to indicate the location, nature and extent of the work proposed and show in detail that the work conforms to the provisions of this code. Construction documents for buildings more than two stories in height shall indicate where penetrations will be made for installations and shall indicate the materials and methods for maintaining required structural safety, fire-resistance rating and fireblocking.

Exception: The code official shall have the authority to waive the submission of construction documents, calculations or other data if the nature of the work applied for is such that reviewing of construction documents is not necessary to determine compliance with this code.

[A] 106.3.2 Time limitation of application. An application for a permit for any proposed work shall be deemed to have been abandoned 180 days after the date of filing, unless such application has been pursued in good faith or a permit has been issued; except that the code official shall have the authority to grant one or more extensions of time for additional periods not exceeding 180 days each. The extension shall be requested in writing and justifiable cause demonstrated.

[A] 106.4 Preliminary inspection. Before a permit is issued, the code official is authorized to inspect and evaluate the systems, equipment, buildings, devices, premises and spaces or areas to be used.

[A] 106.5 Permit issuance. The application, construction documents and other data filed by an applicant for a permit shall be reviewed by the code official. If the code official finds that the proposed work conforms to the requirements of this code and all laws and ordinances applicable thereto, and that the fees specified in Section 106.6 have been paid, a permit shall be issued to the applicant.

[A] 106.5.1 Approved construction documents. When the code official issues the permit where construction documents are required, the construction documents shall be endorsed in writing and stamped “APPROVED.” Such approved construction documents shall not be changed, modified or altered without authorization from the code official. Work shall be done in accordance with the approved construction documents.

The code official shall have the authority to issue a permit for the construction of part of an installation before the construction documents for the entire installation have been submitted or approved, provided adequate information and detailed statements have been filed complying with all pertinent requirements of this code. The holder of such permit shall proceed at his or her own risk without assurance that the permit for the entire installation will be granted.

[A] 106.5.2 Validity. The issuance of a permit or approval of construction documents shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of this code or of other ordinances of the jurisdiction. A permit presuming to give authority to violate or cancel the provisions of this code shall be invalid.

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The issuance of a permit based upon construction documents and other data shall not prevent the code official from thereafter requiring the correction of errors in said construction documents and other data or from preventing building operations from being carried on thereunder when in violation of this code or of other ordinances of this jurisdiction.

[A] 106.5.3 Expiration. Every permit issued by the code official under the provisions of this code shall expire by limitation and become null and void if the work authorized by such permit is not commenced within 180 days from the date of such permit, or is suspended or abandoned at any time after the work is commenced for a period of 180 days. Before such work recommences, a new permit shall be first obtained and the fee, therefor, shall be one-half the amount required for a new permit for such work, provided no changes have been or will be made in the original construction documents for such work, and further that such suspension or abandonment has not exceeded one year.

[A] 106.5.4 Extensions. A permittee holding an unexpired permit shall have the right to apply for an extension of the time within which he or she will commence work under that permit when work is unable to be commenced within the time required by this section for good and satisfactory reasons. The code official shall extend the time for action by the permittee for a period not exceeding 180 days if there is reasonable cause. A permit shall not be extended more than once. The fee for an extension shall be one-half the amount required for a new permit for such work.

[A] 106.5.5 Suspension or revocation of permit. The code official shall have the authority to suspend or revoke a permit issued under the provisions of this code wherever the permit is issued in error or on the basis of incorrect, inaccurate or incomplete information, or in violation of any ordinance or regulation or any of the provisions of this code.

[A] 106.5.6 Retention of construction documents. One set of approved construction documents shall be retained by the code official for a period of not less than 180 days from date of completion of the permitted work, or as required by state or local laws. One set of approved construction documents shall be returned to the applicant, and said set shall be kept on the site of the building or work at all times during which the work authorized thereby is in progress.

[A] 106.5.7 Previous approvals. This code shall not require changes in the construction documents, construction or designated occupancy of a structure for which a lawful permit has been heretofore issued or otherwise lawfully authorized, and the construction of which has been pursued in good faith within 180 days after the effective date of this code and has not been abandoned.

[A] 106.5.8 Posting of permit. The permit or a copy shall be kept on the site of the work until the completion of the project.

[A] 106.6 Fees. A permit shall not be issued until the fees prescribed in Section 106.6.2 have been paid, nor shall an amendment to a permit be released until the additional fee, if any, due to an increase of the installation, has been paid.

[A] 106.6.1 Work commencing before permit issuance. Any person who commences work on an installation before obtaining the necessary permits shall be subject to 100 percent of the usual permit fee in addition to the required permit fees.

[A] 106.6.2 Fee schedule. The fees for work shall be as indicated in the following schedule.

[JURISDICTION TO INSERT APPROPRIATE SCHEDULE]

[A] 106.6.3 Fee refunds. The code official shall authorize the refunding of fees as follows.

  1. The full amount of any fee paid hereunder which was erroneously paid or collected.
  2. Not more than [SPECIFY PERCENTAGE] percent of the permit fee paid when no work has been done under a permit issued in accordance with this code.
  3. Not more than [SPECIFY PERCENTAGE] percent of the plan review fee paid when an application for a permit for which a plan review fee has been paid is withdrawn or canceled before any plan review effort has been expended.

The code official shall not authorize the refunding of any fee paid, except upon written application filed by the original permittee not later than 180 days after the date of fee payment.

SECTION 107 (IFGC)
INSPECTIONS AND TESTING

[A] 107.1 General. The code official is authorized to conduct such inspections as are deemed necessary to determine compliance with the provisions of this code. Construction or work for which a permit is required shall be subject to inspection by the code official, and such construction or work shall remain accessible and exposed for inspection purposes until approved. Approval as a result of an inspection shall not be construed to be an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Inspections presuming to give authority to violate or cancel the provisions of this code or of other ordinances of the jurisdiction shall not be valid.

[A] 107.2 Required inspections and testing. The code official, upon notification from the permit holder or the permit holder’s agent, shall make the following inspections and other such inspections as necessary, and shall either release that portion of the construction or notify the permit holder or the permit holder’s agent of violations that are required to be corrected. The holder of the permit shall be responsible for scheduling such inspections.

  1. Underground inspection shall be made after trenches or ditches are excavated and bedded, piping is installed and before backfill is put in place. When excavated soil contains rocks, broken concrete, frozen chunks and other rubble that would damage or break the piping or cause corrosive action, clean backfill shall be on the job site. 5
  2. Rough-in inspection shall be made after the roof, framing, fireblocking and bracing are in place and components to be concealed are complete, and prior to the installation of wall or ceiling membranes.
  3. Final inspection shall be made upon completion of the installation.

The requirements of this section shall not be considered to prohibit the operation of any heating appliance installed to replace existing heating appliance serving an occupied portion of a structure in the event a request for inspection of such heating appliance has been filed with the department not more than 48 hours after replacement work is completed, and before any portion of such appliance is concealed by any permanent portion of the structure.

[A] 107.2.1 Other inspections. In addition to the inspections specified above, the code official is authorized to make or require other inspections of any construction work to ascertain compliance with the provisions of this code and other laws that are enforced.

[A] 107.2.2 Inspection requests. It shall be the duty of the holder of the permit or his or her duly authorized agent to notify the code official when work is ready for inspection. It shall be the duty of the permit holder to provide access to and means for inspections of such work that are required by this code.

[A] 107.2.3 Approval required. Work shall not be done beyond the point indicated in each successive inspection without first obtaining the approval of the code official. The code official, upon notification, shall make the requested inspections and shall either indicate the portion of the construction that is satisfactory as completed, or notify the permit holder or his or her agent wherein the same fails to comply with this code. Any portions that do not comply shall be corrected and such portion shall not be covered or concealed until authorized by the code official.

[A] 107.2.4 Approved inspection agencies. The code official is authorized to accept reports of approved agencies, provided that such agencies satisfy the requirements as to qualifications and reliability.

[A] 107.2.5 Evaluation and follow-up inspection services. Prior to the approval of a prefabricated construction assembly having concealed work and the issuance of a permit, the code official shall require the submittal of an evaluation report on each prefabricated construction assembly, indicating the complete details of the installation, including a description of the system and its components, the basis upon which the system is being evaluated, test results and similar information and other data as necessary for the code official to determine conformance to this code.

[A] 107.2.5.1 Evaluation service. The code official shall designate the evaluation service of an approved agency as the evaluation agency, and review such agency’s evaluation report for adequacy and conformance to this code.

[A] 107.2.5.2 Follow-up inspection. Except where ready access is provided to installations, appliances, service equipment and accessories for complete inspection at the site without disassembly or dismantling, the code official shall conduct the in-plant inspections as frequently as necessary to ensure conformance to the approved evaluation report or shall designate an independent, approved inspection agency to conduct such inspections. The inspection agency shall furnish the code official with the follow-up inspection manual and a report of inspections upon request, and the installation shall have an identifying label permanently affixed to the system indicating that factory inspections have been performed.

[A] 107.2.5.3 Test and inspection records. Required test and inspection records shall be available to the code official at all times during the fabrication of the installation and the erection of the building; or such records as the code official designates shall be filed.

[A] 107.3 Testing. Installations shall be tested as required in this code and in accordance with Sections 107.3.1 through 107.3.3. Tests shall be made by the permit holder and observed by the code official.

[A] 107.3.1 New, altered, extended or repaired installations. New installations and parts of existing installations, which have been altered, extended, renovated or repaired, shall be tested as prescribed herein to disclose leaks and defects.

[A] 107.3.2 Apparatus, instruments, material and labor for tests. Apparatus, instruments, material and labor required for testing an installation or part thereof shall be furnished by the permit holder.

[A] 107.3.3 Reinspection and testing. Where any work or installation does not pass an initial test or inspection, the necessary corrections shall be made so as to achieve compliance with this code. The work or installation shall then be resubmitted to the code official for inspection and testing.

[A] 107.4 Approval. After the prescribed tests and inspections indicate that the work complies in all respects with this code, a notice of approval shall be issued by the code official.

[A] 107.4.1 Revocation. The code official is authorized to, in writing, suspend or revoke a notice of approval issued under the provisions of this code wherever the notice is issued in error, or on the basis of incorrect information supplied or where it is determined that the building or structure, premise, or portion thereof is in violation of any ordinance or regulation or any of the provisions of this code.

[A] 107.5 Temporary connection. The code official shall have the authority to allow the temporary connection of an installation to the sources of energy for the purpose of testing the installation or for use under a temporary certificate of occupancy.

[A] 107.6 Connection of service utilities. A person shall not make connections from a utility, source of energy, fuel or power to any building or system that is regulated by this code for which a permit is required until authorized by the code official.

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SECTION 108 (IFGC)
VIOLATIONS

[A] 108.1 Unlawful acts. It shall be unlawful for a person, firm or corporation to erect, construct, alter, repair, remove, demolish or utilize an installation, or cause same to be done, in conflict with or in violation of any of the provisions of this code.

[A] 108.2 Notice of violation. The code official shall serve a notice of violation or order to the person responsible for the erection, installation, alteration, extension, repair, removal or demolition of work in violation of the provisions of this code, or in violation of a detail statement or the approved construction documents thereunder, or in violation of a permit or certificate issued under the provisions of this code. Such order shall direct the discontinuance of the illegal action or condition and the abatement of the violation.

[A] 108.3 Prosecution of violation. If the notice of violation is not complied with promptly, the code official shall request the legal counsel of the jurisdiction to institute the appropriate proceeding at law or in equity to restrain, correct or abate such violation, or to require the removal or termination of the unlawful occupancy of the structure in violation of the provisions of this code or of the order or direction made pursuant thereto.

[A] 108.4 Violation penalties. Persons who shall violate a provision of this code, fail to comply with any of the requirements thereof or erect, install, alter or repair work in violation of the approved construction documents or directive of the code official, or of a permit or certificate issued under the provisions of this code, shall be guilty of a [SPECIFY OFFENSE], punishable by a fine of not more than [AMOUNT] dollars or by imprisonment not exceeding [NUMBER OF DAYS], or both such fine and imprisonment. Each day that a violation continues after due notice has been served shall be deemed a separate offense.

[A] 108.5 Stop work orders. Upon notice from the code official that work is being done contrary to the provisions of this code or in a dangerous or unsafe manner, such work shall immediately cease. Such notice shall be in writing and shall be given to the owner of the property, the owner’s agent, or the person doing the work. The notice shall state the conditions under which work is authorized to resume. Where an emergency exists, the code official shall not be required to give a written notice prior to stopping the work. Any person who shall continue any work on the system after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be liable for a fine of not less than [AMOUNT] dollars or more than [AMOUNT] dollars.

[A] 108.6 Abatement of violation. The imposition of the penalties herein prescribed shall not preclude the legal officer of the jurisdiction from instituting appropriate action to prevent unlawful construction, restrain, correct or abate a violation, prevent illegal occupancy of a building, structure or premises, or stop an illegal act, conduct, business or utilization of the installations on or about any premises.

[A] 108.7 Unsafe installations. An installation that is unsafe, constitutes a fire or health hazard, or is otherwise dangerous to human life, as regulated by this code, is hereby declared an unsafe installation. Use of an installation regulated by this code constituting a hazard to health, safety or welfare by reason of inadequate maintenance, dilapidation, fire hazard, disaster, damage or abandonment is hereby declared an unsafe use. Such unsafe installations are hereby declared to be a public nuisance and shall be abated by repair, rehabilitation, demolition or removal.

[A] 108.7.1 Authority to condemn installations. Whenever the code official determines that any installation, or portion thereof, regulated by this code has become hazardous to life, health or property, he or she shall order in writing that such installations either be removed or restored to a safe condition. A time limit for compliance with such order shall be specified in the written notice. A person shall not use or maintain a defective installation after receiving such notice.

When such installation is to be disconnected, written notice as prescribed in Section 108.2 shall be given. In cases of immediate danger to life or property, such disconnection shall be made immediately without such notice.

[A] 108.7.2 Authority to disconnect service utilities. The code official shall have the authority to require disconnection of utility service to the building, structure or system regulated by the technical codes in case of emergency where necessary to eliminate an immediate hazard to life or property. The code official shall notify the serving utility, and wherever possible, the owner and occupant of the building, structure or service system of the decision to disconnect prior to taking such action. If not notified prior to disconnection, the owner or occupant of the building, structure or service system shall be notified in writing, as soon as practicable thereafter.

[A] 108.7.3 Connection after order to disconnect. A person shall not make energy source connections to installations regulated by this code which have been disconnected or ordered to be disconnected by the code official, or the use of which has been ordered to be discontinued by the code official until the code official authorizes the reconnection and use of such installations.

When an installation is maintained in violation of this code, and in violation of a notice issued pursuant to the provisions of this section, the code official shall institute appropriate action to prevent, restrain, correct or abate the violation.

SECTION 109 (IFGC)
MEANS OF APPEAL

[A] 109.1 Application for appeal. A person shall have the right to appeal a decision of the code official to the board of appeals. An application for appeal shall be based on a claim that the true intent of this code or the rules legally adopted thereunder have been incorrectly interpreted, the provisions of this code do not fully apply or an equally good or better form of construction is proposed. The application shall be filed on a form obtained from the code official within 20 days after the notice was served.

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[A] 109.2 Membership of board. The board of appeals shall consist of five members appointed by the chief appointing authority as follows: one for five years; one for four years; one for three years; one for two years and one for one year. Thereafter, each new member shall serve for five years or until a successor has been appointed.

[A] 109.2.1 Qualifications. The board of appeals shall consist of five individuals, one from each of the following professions or disciplines.

  1. Registered design professional who is a registered architect; or a builder or superintendent of building construction with at least 10 years’ experience, five of which shall have been in responsible charge of work.
  2. Registered design professional with structural engineering or architectural experience.
  3. Registered design professional with fuel gas and plumbing engineering experience; or a fuel gas contractor with at least 10 years’ experience, five of which shall have been in responsible charge of work.
  4. Registered design professional with electrical engineering experience; or an electrical contractor with at least 10 years’ experience, five of which shall have been in responsible charge of work.
  5. Registered design professional with fire protection engineering experience; or a fire protection contractor with at least 10 years’ experience, five of which shall have been in responsible charge of work.

[A] 109.2.2 Alternate members. The chief appointing authority shall appoint two alternate members who shall be called by the board chairman to hear appeals during the absence or disqualification of a member. Alternate members shall possess the qualifications required for board membership and shall be appointed for five years, or until a successor has been appointed.

[A] 109.2.3 Chairman. The board shall annually select one of its members to serve as chairman.

[A] 109.2.4 Disqualification of member. A member shall not hear an appeal in which that member has a personal, professional or financial interest.

[A] 109.2.5 Secretary. The chief administrative officer shall designate a qualified clerk to serve as secretary to the board. The secretary shall file a detailed record of all proceedings in the office of the chief administrative officer.

[A] 109.2.6 Compensation of members. Compensation of members shall be determined by law.

[A] 109.3 Notice of meeting. The board shall meet upon notice from the chairman, within 10 days of the filing of an appeal, or at stated periodic meetings.

[A] 109.4 Open hearing. All hearings before the board shall be open to the public. The appellant, the appellant’s representative, the code official and any person whose interests are affected shall be given an opportunity to be heard.

[A] 109.4.1 Procedure. The board shall adopt and make available to the public through the secretary procedures under which a hearing will be conducted. The procedures shall not require compliance with strict rules of evidence, but shall mandate that only relevant information be received.

[A] 109.5 Postponed hearing. When five members are not present to hear an appeal, either the appellant or the appellant’s representative shall have the right to request a postponement of the hearing.

[A] 109.6 Board decision. The board shall modify or reverse the decision of the code official by a concurring vote of three members.

[A] 109.6.1 Resolution. The decision of the board shall be by resolution. Certified copies shall be furnished to the appellant and to the code official.

[A] 109.6.2 Administration. The code official shall take immediate action in accordance with the decision of the board.

[A] 109.7 Court review. Any person, whether or not a previous party to the appeal, shall have the right to apply to the appropriate court for a writ of certiorari to correct errors of law. Application for review shall be made in the manner and time required by law following the filing of the decision in the office of the chief administrative officer.

SECTION 110 (IFGC)
TEMPORARY EQUIPMENT, SYSTEMS AND USES

[A] 110.1 General. The code official is authorized to issue a permit for temporary equipment, systems and uses. Such permits shall be limited as to time of service, but shall not be permitted for more than 180 days. The code official is authorized to grant extensions for demonstrated cause.

[A] 110.2 Conformance. Temporary equipment, systems and uses shall conform to the structural strength, fire safety, means of egress, accessibility, light, ventilation and sanitary requirements of this code as necessary to ensure the public health, safety and general welfare.

[A] 110.3 Temporary utilities. The code official is authorized to give permission to temporarily supply utilities before an installation has been fully completed and the final certificate of completion has been issued. The part covered by the temporary certificate shall comply with the requirements specified for temporary lighting, heat or power in the code.

[A] 110.4 Termination of approval. The code official is authorized to terminate such permit for a temporary structure or use and to order the temporary structure or use to be discontinued.

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CHAPTER 2
DEFINITIONS

SECTION 201 (IFGC)
GENERAL

201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code and standard, have the meanings indicated in this chapter.

201.2 Interchangeability. Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the International Building Code, International Fire Code, International Mechanical Code or International Plumbing Code, such terms shall have meanings ascribed to them as in those codes.

201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies.

SECTION 202 (IFGC)
GENERAL DEFINITIONS

[M] ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also “Ready access”).

AIR CONDITIONER, GAS-FIRED. A gas-burning, automatically operated appliance for supplying cooled and/or dehumidified air or chilled liquid.

[M] AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the requirements of a conditioned space.

[M] AIR, EXHAUST. Air being removed from any space or piece of equipment or appliance and conveyed directly to the atmosphere by means of openings or ducts.

[M] AIR-HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area.

[M] AIR, MAKEUP. Air that is provided to replace air being exhausted.

[A] ALTERATION. A change in a system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.

ANODELESS RISER. A transition assembly in which plastic piping is installed and terminated above ground outside of a building.

[M] APPLIANCE. Any apparatus or device that utilizes a fuel or raw material to produce light, heat, power, refrigeration or air conditioning.

APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic burner ignition and safety shutoff device and other automatic devices which accomplish complete turn-on and shutoff of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shutoff of the gas.

APPLIANCE, FAN-ASSISTED COMBUSTION. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.

APPLIANCE TYPE.

Low-heat appliance (residential appliance). Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of 1,000°F (538°C) or less.

Medium-heat appliance. Any appliance in which the products of combustion at the point of entrance to the flue under normal operating conditions have a temperature of more than 1,000°F (538°C), but not greater than 2,000°F (1093°C).

APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outside atmosphere.

APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products of combustion are conveyed directly from the appliance to the outside atmosphere through an approved chimney or vent system.

[A] APPROVED. Acceptable to the code official or other authority having jurisdiction.

[A] APPROVED AGENCY. An established and recognized agency that is approved by the code official and regularly engaged in conducting tests or furnishing inspection services.

ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of the earth, approximately 14.7 pounds per square inch (psi) (101 kPa absolute) at sea level.

AUTOMATIC IGNITION. Ignition of gas at the burner(s) when the gas controlling device is turned on, including reignition if the flames on the burner(s) have been extinguished by means other than by the closing of the gas controlling device.

BAFFLE. An object placed in an appliance to change the direction of or retard the flow of air, air-gas mixtures or flue gases.

BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double-acting barometric draft

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regulator is one whose balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft.

BOILER, LOW-PRESSURE. A self-contained appliance for supplying steam or hot water.

Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.

Hot water supply boiler. A boiler, completely filled with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.

Steam heating boiler. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig (100 kPa gauge).

BONDING JUMPER. A conductor installed to electrically connect metallic gas piping to the grounding electrode system.

BRAZING. A metal-joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F (538°C), but lower than that of the base metal being joined. The filler material is distributed between the closely fitted surfaces of the joint by capillary action.

BROILER. A general term including salamanders, barbecues and other appliances cooking primarily by radiated heat, excepting toasters.

BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F (0.56°C) (1 Btu = 1055 J).

BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.

Induced-draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner.

Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with this added pressure being applied at the burner.

[M] CHIMNEY. A primarily vertical structure containing one or more flues, for the purpose of carrying gaseous products of combustion and air from an appliance to the outside atmosphere.

Factory-built chimney. A listed and labeled chimney composed of factory-made components, assembled in the field in accordance with manufacturer’s instructions and the conditions of the listing.

Masonry chimney. A field-constructed chimney composed of solid masonry units, bricks, stones or concrete.

Metal chimney. A field-constructed chimney of metal.

[M] CLEARANCE. The minimum distance through air measured between the heat-producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly.

CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air. Dryer classifications are as follows:

Type 1. Factory-built package, multiple production. Primarily used in family living environment. Usually the smallest unit physically and in function output.

Type 2. Factory-built package, multiple production. Used in business with direct intercourse of the function with the public. Not designed for use in individual family living environment.

[A] CODE. These regulations, subsequent amendments thereto or any emergency rule or regulation that the administrative authority having jurisdiction has lawfully adopted.

[A] CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.

[M] COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component materials that are not defined as noncombustible.

COMBUSTIBLE MATERIAL. Any material not defined as noncombustible.

[M] COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light.

COMBUSTION AIR. Air necessary for complete combustion of a fuel, including theoretical air and excess air.

[M] COMBUSTION CHAMBER. The portion of an appliance within which combustion occurs.

COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including inert gases, but excluding excess air.

CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finish surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed.

CONCEALED PIPING. Piping that is located in a concealed location (see “Concealed location”).

CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure.

CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings, semirigid metallic tubing and fittings or a listed and labeled device that connects an appliance to the gas piping system.

CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent.

[A] CONSTRUCTION DOCUMENTS. All of the written, graphic and pictorial documents prepared or assembled for describing the design, location and physical characteristics of the elements of the project necessary for obtaining a mechanical permit.

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CONTROL. A manual or automatic device designed to regulate the gas, air, water or electrical supply to, or operation of, a mechanical system.

CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally utilizing another fuel.

COUNTER APPLIANCES. Appliances such as coffee brewers and coffee urns and any appurtenant water-heating appliance, food and dish warmers, hot plates, griddles, waffle bakers and other appliances designed for installation on or in a counter.

CUBIC FOOT. The amount of gas that occupies 1 cubic foot (0.02832 m3) when at a temperature of 60°F (16°C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa).

DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases.

DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.

DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance designed for installation within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames.

DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour, or Btu/h (1 Btu/h = 0.2931 W).

[B] DESIGN FLOOD ELEVATION. The elevation of the “design flood,” including wave height, relative to the datum specified on the community’s legally designated flood hazard map.

DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases.

DIRECT-VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outside atmosphere and all flue gases are discharged directly to the outside atmosphere.

DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion through the gas passages of the appliance to the atmosphere.

Mechanical or induced draft. The pressure difference created by the action of a fan, blower or ejector that is located between the appliance and the chimney or vent termination.

Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere.

DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appliance, that is designed to (1) provide for ready escape of the flue gases from the appliance in the event of no draft, back-draft or stoppage beyond the draft hood, (2) prevent a back-draft from entering the appliance, and (3) neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance.

DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value.

DRIP. The container placed at a low point in a system of piping to collect condensate and from which the condensate is removable.

DRY GAS. A gas having a moisture and hydrocarbon dew-point below any normal temperature to which the gas piping is exposed.

DUCT FURNACE. A warm-air furnace normally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm-air heating appliance that depends for air circulation on a blower not furnished as part of the furnace.

[M] DUCT SYSTEM. A continuous passageway for the transmission of air that, in addition to ducts, includes duct fittings, dampers, plenums, fans and accessory air-handling equipment.

[A] DWELLING UNIT. A single unit providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.

EQUIPMENT. Apparatus and devices other than appliances.

EXCESS FLOW VALVE (EFV). A valve designed to activate when the fuel gas passing through it exceeds a prescribed flow rate.

EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line.

FIREPLACE. A fire chamber and hearth constructed of noncombustible material for use with solid fuels and provided with a chimney.

Factory-built fireplace. A fireplace composed of listed factory-built components assembled in accordance with the terms of listing to form the completed fireplace.

Masonry fireplace. A hearth and fire chamber of solid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney.

FIRING VALVE. A valve of the plug and barrel type designed for use with gas, and equipped with a lever handle for manual operation and a dial to indicate the percentage of opening.

FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of ignition of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners.

FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system.

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[B] FLOOD HAZARD AREA. The greater of the following two areas:

  1. The area within a floodplain subject to a 1 percent or greater chance of flooding in any given year.
  2. This area designated as a flood hazard area on a community’s flood hazard map, or otherwise legally designated.

FLOOR FURNACE. A completely self-contained furnace suspended from the floor of the space being heated, taking air for combustion from outside such space and with means for observing flames and lighting the appliance from such space.

Fan type. A floor furnace equipped with a fan which provides the primary means for circulating air.

Gravity type. A floor furnace depending primarily upon circulation of air by gravity. This classification shall also include floor furnaces equipped with booster-type fans which do not materially restrict free circulation of air by gravity flow when such fans are not in operation.

FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood.

FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system.

FLUE GASES. Products of combustion plus excess air in appliance flues or heat exchangers.

FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding structure from the effects of combustion products and for conveying combustion products without leakage to the atmosphere.

FUEL GAS. A. natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases.

[M] FURNACE. A completely self-contained heating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location.

FURNACE, CENTRAL. A self-contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location.

Downflow furnace. A furnace designed with airflow discharge vertically downward at or near the bottom of the furnace.

Forced air furnace with cooling unit. A single-package unit, consisting of a gas-fired forced-air furnace of one of the types listed below combined with an electrically or fuel gas-powered summer air-conditioning system, contained in a common casing.

Forced-air type. A central furnace equipped with a fan or blower which provides the primary means for circulation of air.

Gravity furnace with booster fan. A furnace equipped with a booster fan that does not materially restrict free circulation of air by gravity flow when the fan is not in operation.

Gravity type. A central furnace depending primarily on circulation of air by gravity.

Horizontal forced-air type. A furnace with airflow through the appliance essentially in a horizontal path.

Multiple-position furnace. A furnace designed so that it can be installed with the airflow discharge in the upflow, horizontal or downflow direction.

Upflow furnace. A furnace designed with airflow discharge vertically upward at or near the top of the furnace. This classification includes “highboy” furnaces with the blower mounted below the heating element and “lowboy” furnaces with the blower mounted beside the heating element.

FURNACE, ENCLOSED. A specific heating, or heating and ventilating, furnace incorporating an integral total enclosure and using only outside air for combustion.

FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and which forms part of an air distribution system.

GAS CON VENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and disconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the closed position.

GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas.

[F] GASEOUS HYDROGEN SYSTEM. See Section 702.1.

[M] HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the building code as a high-hazard group classification.

HOUSE PIPING. See “Piping system.”

[F] HYDROGEN CUT-OFF ROOM. See Section 702.1.

HYDROGEN GENERATING APPLIANCE. See Section 702.1.

IGNITION PILOT. A pilot that operates during the lighting cycle and discontinues during main burner operation.

[M] IGNITION SOURCE. A flame, spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors and electrical switching devices.

INCINERATOR. An appliance used to reduce combustible refuse material to ashes and which is manufactured, sold and installed as a complete unit.

INDUSTRIAL AIR HEATERS, DIRECT-FIRED NON-RECIRCULATING. A heater in which all the products of combustion generated by the burners are released into the air

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stream being heated. The purpose of the heater is to offset building heat loss by heating only outdoor air.

INDUSTRIAL AIR HEATERS, DIRECT-FIRED RECIRCULATING. A heater in which all the products of combustion generated by the burners are released into the air stream being heated. The purpose of the heater is to offset building heat loss by heating outdoor air, and, if applicable, indoor air.

INFRARED RADIANT HEATER. A heater that directs a substantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type.

JOINT, FLANGED. A joint made by bolting together a pair of flanged ends.

JOINT, FLARED. A metal-to-metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare.

JOINT, MECHANICAL. A general form of gas-tight joints obtained by the joining of metal parts through a positive-holding mechanical construction, such as press joint, flanged joint, threaded joint, flared joint or compression joint.

JOINT, PLASTIC ADHESIV E. A joint made in thermoset plastic piping by the use of an adhesive substance which forms a continuous bond between the mating surfaces without dissolving either one of them.

JOINT, PLASTIC HEAT FUSION. A joint made in thermoplastic piping by heating the parts sufficiently to permit fusion of the materials when the parts are pressed together.

JOINT, WELDED. A gas-tight joint obtained by the joining of metal parts in molten state.

[A] LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, inspection agency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.

LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak.

LIMIT CONTROL. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance.

LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). Liquefied petroleum gas composed predominately of propane, propylene, butanes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures.

[A] LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.

LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes.

LOG LIGHTER. A manually operated solid fuel ignition appliance for installation in a vented solid fuel-burning fireplace.

LUBRICATED PLUG-TYPE VALVE. A valve of the plug and barrel type provided with means for maintaining a lubricant between the bearing surfaces.

MAIN BURNER. A device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone, and on which combustion takes place to accomplish the function for which the appliance is designed.

METER. The instrument installed to measure the volume of gas delivered through it.

MODULATING. Modulating or throttling is the action of a control from its maximum to minimum position in either predetermined steps or increments of movement as caused by its actuating medium.

[M] NONCOMBUSTIBLE MATERIALS. Materials that, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria:

  1. The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54°F (30°C) above the furnace temperature at the beginning of the test.
  2. There shall not be flaming from the specimen after the first 30 seconds.
  3. If the weight loss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flaming of the specimen.

[A] OCCUPANCY. The purpose for which a building, or portion thereof, is utilized or occupied.

OFFSET (VENT). A combination of approved bends that makes two changes in direction bringing one section of the vent out of line but into a line parallel with the other section.

ORIFICE. The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner.

OUTLET. The point at which a gas-fired appliance connects to the gas piping system.

OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the gas supply to

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the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level.

PILOT. A small flame that is utilized to ignite the gas at the main burner or burners.

PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both.

Pipe. A rigid conduit of iron, steel, copper, brass or plastic.

Tubing. Semirigid conduit of copper, aluminum, plastic or steel.

PIPING SYSTEM. All fuel piping, valves and fittings from the outlet of the point of delivery to the outlets of the appliance shutoff valves.

PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature.

POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a valve is provided at the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. For undiluted liquefied petroleum gas systems, the point of delivery shall be considered to be the outlet of the service pressure regulator, exclusive of line gas regulators, in the system.

PORTABLE FUEL CELL APPLIANCE. A fuel cell generator of electricity, which is not fixed in place. A portable fuel cell appliance utilizes a cord and plug connection to a grid-isolated load and has an integral fuel supply.

PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burners.

PRESSURE TEST. An operation performed to verify the gas-tight integrity of gas piping following its installation or modification.

PURGE. To free a gas conduit of air or gas, or a mixture of gas and air.

QUICK-DISCONNECT DEVICE. A hand-operated device that provides a means for connecting and disconnecting an appliance or an appliance connector to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device is disconnected.

[M] READY ACCESS (TO). That which enables a device. appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction (see “Access”).

[A] REGISTERED DESIGN PROFESSIONAL. An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed.

REGULATOR. A device for controlling and maintaining a uniform supply pressure, either pounds-to-inches water column (MP regulator) or inches-to-inches water column (appliance regulator).

REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the appliance. Types of appliance regulators are as follows:

Adjustable.

  1. Spring type, limited adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjustable over a range of not more than 15 percent of the outlet pressure at the midpoint of the adjustment range.
  2. Spring type, standard adjustment. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is adjustable. The adjustment means shall be concealed.

Multistage. A regulator for use with a single gas whose adjustment means is capable of being positioned manually or automatically to two or more predetermined outlet pressure settings. Each of these settings shall be adjustable or nonadjustable. The regulator may modulate outlet pressures automatically between its maximum and minimum predetermined outlet pressure settings.

Nonadjustable.

  1. Spring type, nonadjustable. A regulator in which the regulating force acting upon the diaphragm is derived principally from a spring, the loading of which is not field adjustable.
  2. Weight type. A regulator in which the regulating force acting upon the diaphragm is derived from a weight or combination of weights.

REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device.

REGULATOR, MEDIUM-PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure.

REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device.

REGULATOR, SERVICE PRESSURE. For natural gas systems, a device installed by the serving gas supplier to reduce and limit the service line pressure to delivery pressure. For undiluted liquefied petroleum gas systems, the regulator located upstream from all line gas pressure regulators, where installed, and downstream from any first stage or a high pressure regulator in the system.

RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, back draft or stoppage beyond the draft hood, and to permit air into the draft hood in the event of a strong chimney updraft.

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RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum in the hot water supply system.

RELIEF VALVE. PRESSURE. An automatic valve that opens and closes a relief vent, depending on whether the pressure is above or below a predetermined value.

RELIEF VALVE, TEMPERATURE.

Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position.

Reseating or self-closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value.

RELIEF VALVE, VACUUM. A valve that automatically opens and closes a vent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value.

RISER, GAS. A vertical pipe supplying fuel gas.

ROOM HEATER, UNVENTED. See “Unvented room heater.”

ROOM HEATER, VENTED. A free-standing heating unit used for direct heating of the space in and adjacent to that in which the unit is located (see also “Vented room heater”).

SAFETY SHUTOFF DEVICE. See “Flame safeguard.”

[B] SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof.

[B] SLEEPING UNIT. A room or space in which people sleep, which can also include permanent provisions for living, eating and either sanitation or kitchen facilities, but not both. Such rooms and spaces that are also part of a dwelling unit are not sleeping units.

SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition.

STATIONARY FUEL CELL POWER PLANT. A self-contained package or factory-matched packages which constitute an automatically operated assembly of integrated systems for generating electrical energy and recoverable thermal energy that is permanently connected and fixed in place.

THERMOSTAT.

Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures.

Integral gas valve type. An automatic device, actuated by temperature changes, designed to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device.

  1. Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change.
  2. Snap-acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vice versa.

[P] THIRD-PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer’s quality control system.

[P] THIRD-PARTY CERTIFIED. Certification obtained by the manufacturer indicating that the function and performance characteristics of a product or material have been determined by testing and ongoing surveillance by an approved third-party certification agency. Assertion of certification is in the form of identification in accordance with the requirements of the third-party certification agency.

[P] THIRD-PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a product, material or system conforms to specified requirements.

TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure-tight connection between two materials which cannot be joined directly one to another.

UNIT HEATER.

High-static pressure type. A self-contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch (15 mm H2O) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct.

Low-static pressure type. A self-contained, automatically controlled, vented appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s specifications.

UNLISTED BOILER. A boiler not listed by a nationally recognized testing agency.

UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliances provide radiant heat or convection heat by gravity or fan circulation directly from the heater and do not utilize ducts.

VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance.

Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement.

Automatic. An automatic or semiautomatic device consisting essentially of a valve and operator that control the gas supply to the burner(s) during operation of an appliance.

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The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other approved means.

Automatic gas shutoff. A valve used in conjunction with an automatic gas shutoff device to shut off the gas supply to a water-heating system. It shall be constructed integrally with the gas shutoff device or shall be a separate assembly.

Individual main burner. A valve that controls the gas supply to an individual main burner.

Main burner control. A valve that controls the gas supply to the main burner manifold.

Manual main gas-control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff.

Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe conditions occur. The device remains closed until manually reopened.

Service shutoff. A valve, installed by the serving gas supplier between the service meter or source of supply and the customer piping system, to shut off the entire piping system.

VENT. A pipe or other conduit composed of factory-made components, containing a passageway for conveying combustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance.

Special gas vent. A vent listed and labeled for use with listed Category II, III and IV appliances.

Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents.

Type BW vent. A vent listed and labeled for use with wall furnaces.

Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents.

VENT CONNECTOR. See “Connector.”

VENT GASES. Products of combustion from appliances plus excess air plus dilution air in the vent connector, gas vent or chimney above the draft hood or draft regulator.

VENT PIPING.

Breather. Piping run from a pressure-regulating device to the outdoors, designed to provide a reference to atmospheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent.

Relief. Piping run from a pressure-regulating or pressure-limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system.

VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are classified into the following four categories:

Category I. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.

Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.

Category III. An appliance that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.

Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.

VENTED ROOM HEATER. A vented self-contained, freestanding, nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections.

VENTED WALL FURNACE. A self-contained vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated through openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined.

VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outside atmosphere for the purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway.

Forced-draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under positive static vent pressure.

Induced draft venting system. A portion of a venting system using a fan or other mechanical means to cause the removal of flue or vent gases under nonpositive static vent pressure.

Mechanical draft venting system. A venting system designed to remove flue or vent gases by mechanical means, that consists of an induced draft portion under non-positive static pressure or a forced draft portion under positive static pressure.

Natural draft venting system. A venting system designed to remove flue or vent gases under nonpositive static vent pressure entirely by natural draft.

WALL HEATER, UNVENTED-TYPE. A room heater of the type designed for insertion in or attachment to a wall or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated.

WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.

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CHAPTER 3
GENERAL REGULATIONS

SECTION 301 (IFGC)
GENERAL

301.1 Scope. This chapter shall govern the approval and installation of all equipment and appliances that comprise parts of the installations regulated by this code in accordance with Section 101.2.

301.1.1 Other fuels. The requirements for combustion and dilution air for gas-fired appliances shall be governed by Section 304. The requirements for combustion and dilution air for appliances operating with fuels other than fuel gas shall be regulated by the International Mechanical Code.

301.2 Energy utilization. Heating, ventilating and air-conditioning systems of all structures shall be designed and installed for efficient utilization of energy in accordance with the International Energy Conservation Code.

301.3 Listed and labeled. Appliances regulated by this code shall be listed and labeled for the application in which they are used unless otherwise approved in accordance with Section 105. The approval of unlisted appliances in accordance with Section 105 shall be based upon approved engineering evaluation.

301.4 Labeling. Labeling shall be in accordance with the procedures set forth in Sections 301.4.1 through 301.4.2.3.

301.4.1 Testing. An approved agency shall test a representative sample of the appliances being labeled to the relevant standard or standards. The approved agency shall maintain a record of all of the tests performed. The record shall provide sufficient detail to verify compliance with the test standard.

301.4.2 Inspection and identification. The approved agency shall periodically perform an inspection, which shall be in-plant if necessary, of the appliances to be labeled. The inspection shall verify that the labeled appliances are representative of the appliances tested.

301.4.2.1 Independent. The agency to be approved shall be objective and competent. To confirm its objectivity, the agency shall disclose all possible conflicts of interest.

301.4.2.2 Equipment. An approved agency shall have adequate equipment to perform all required tests. The equipment shall be periodically calibrated.

301.4.2.3 Personnel. An approved agency shall employ experienced personnel educated in conducting, supervising and evaluating tests.

301.5 Label information. A permanent factory-applied nameplate(s) shall be affixed to appliances on which shall appear in legible lettering, the manufacturer’s name or trademark, the model number, serial number and, for listed appliances, the seal or mark of the testing agency. A label shall also include the hourly rating in British thermal units per hour (Btu/h) (W); the type of fuel approved for use with the appliance; and the minimum clearance requirements.

301.6 Plumbing connections. Potable water supply and building drainage system connections to appliances regulated by this code shall be in accordance with the International Plumbing Code.

301.7 Fuel types. Appliances shall be designed for use with the type of fuel gas that will be supplied to them.

301.7.1 Appliance fuel conversion. Appliances shall not be converted to utilize a different fuel gas except where complete instructions for such conversion are provided in the installation instructions, by the serving gas supplier or by the appliance manufacturer.

301.8 Vibration isolation. Where means for isolation of vibration of an appliance is installed, an approved means for support and restraint of that appliance shall be provided.

301.9 Repair. Defective material or parts shall be replaced or repaired in such a manner so as to preserve the original approval or listing.

301.10 Wind resistance. Appliances and supports that are exposed to wind shall be designed and installed to resist the wind pressures determined in accordance with the International Building Code.

[B] 301.11 Flood hazard. For structures located in flood hazard areas, the appliance, equipment and system installations regulated by this code shall be located at or above the elevation required by Section 1612 of the International Building Code for utilities and attendant equipment.

Exception: The appliance, equipment and system installations regulated by this code are permitted to be located below the elevation required by Section 1612 of the International Building Code for utilities and attendant equipment provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding to such elevation.

301.12 Seismic resistance. When earthquake loads are applicable in accordance with the International Building Code, the supports shall be designed and installed for the seismic forces in accordance with that code.

301.13 Ducts. All ducts required for the installation of systems regulated by this code shall be designed and installed in accordance with the International Mechanical Code.

301.14 Rodentproofing. Buildings or structures and the walls enclosing habitable or occupiable rooms and spaces in which persons live, sleep or work, or in which feed, food or foodstuffs are stored, prepared, processed, served or sold, shall be constructed to protect against rodents in accordance with the International Building Code.

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301.15 Prohibited location. The appliances, equipment and systems regulated by this code shall not be located in an elevator shaft.

SECTION 302 (IFGC)
STRUCTURAL SAFETY

[B] 302.1 Structural safety. The building shall not be weakened by the installation of any gas piping. In the process of installing or repairing any gas piping, the finished floors, walls, ceilings, tile work or any other part of the building or premises which is required to be changed or replaced shall be left in a safe structural condition in accordance with the requirements of the International Building Code.

[B] 302.2 Penetrations of floor/ceiling assemblies and fire-resistance-rated assemblies. Penetrations of floor/ceiling assemblies and assemblies required to have a fire-resistance rating shall be protected in accordance with the International Building Code.

[B] 302.3 Cutting, notching and boring in wood members. The cutting, notching and boring of wood members shall comply with Sections 302.3.1 through 302.3.4.

[B] 302.3.1 Engineered wood products. Cuts, notches and holes bored in trusses, structural composite lumber, structural glued-laminated members and I-joists are prohibited except where permitted by the manufacturer’s recommendations or where the effects of such alterations are specifically considered in the design of the member by a registered design professional.

[B] 302.3.2 Joist notching and boring. Notching at the ends of joists shall not exceed one-fourth the joist depth. Holes bored in joists shall not be within 2 inches (51 mm) of the top and bottom of the joist and their diameter shall not exceed one-third the depth of the member. Notches in the top or bottom of the joist shall not exceed one-sixth the depth and shall not be located in the middle one-third of the span.

[B] 302.3.3 Stud cutting and notching. In exterior walls and bearing partitions, any wood stud is permitted to be cut or notched to a depth not exceeding 25 percent of its width. Cutting or notching of studs to a depth not greater than 40 percent of the width of the stud is permitted in nonload-bearing partitions supporting no loads other than the weight of the partition.

[B] 302.3.4 Bored holes. A hole not greater in diameter than 40 percent of the stud depth is permitted to be bored in any wood stud. Bored holes not greater than 60 percent of the depth of the stud are permitted in nonload-bearing partitions or in any wall where each bored stud is doubled, provided not more than two such successive doubled studs are so bored. In no case shall the edge of the bored hole be nearer than 5/8 inch (15.9 mm) to the edge of the stud. Bored holes shall not be located at the same section of a stud as a cut or notch.

[B] 302.4 Alterations to trusses. Truss members and components shall not be cut, drilled, notched, spliced or otherwise altered in any way without the written concurrence and approval of a registered design professional. Alterations resulting in the addition of loads to any member, such as HVAC equipment and water heaters, shall not be permitted without verification that the truss is capable of supporting such additional loading.

[B] 302.5 Cutting, notching and boring holes in structural steel framing. The cutting, notching and boring of holes in structural steel framing members shall be as prescribed by the registered design professional.

[B] 302.6 Cutting, notching and boring holes in cold-formed steel framing. Flanges and lips of load-bearing, cold-formed steel framing members shall not be cut or notched. Holes in webs of load-bearing, cold-formed steel framing members shall be permitted along the centerline of the web of the framing member and shall not exceed the dimensional limitations, penetration spacing or minimum hole edge distance as prescribed by the registered design professional. Cutting, notching and boring holes of steel floor/roof decking shall be as prescribed by the registered design professional.

[B] 302.7 Cutting, notching and boring holes in nonstructural cold-formed steel wall framing. Flanges and lips of nonstructural cold-formed steel wall studs shall be permitted along the centerline of the web of the framing member, shall not exceed l½ inches (38 mm) in width or 4 inches (102 mm) in length, and the holes shall not be spaced less than 24 inches (610 mm) center to center from another hole or less than 10 inches (254 mm) from the bearing end.

SECTION 303 (IFGC)
APPLIANCE LOCATION

303.1 General. Appliances shall be located as required by this section, specific requirements elsewhere in this code and the conditions of the equipment and appliance listing.

303.2 Hazardous locations. Appliances shall not be located in a hazardous location unless listed and approved for the specific installation.

303.3 Prohibited locations. Appliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one of the following:

  1. The appliance is a direct-vent appliance installed in accordance with the conditions of the listing and the manufacturer’s instructions.
  2. Vented room heaters, wall furnaces, vented decorative appliances, vented gas fireplaces, vented gas fireplace heaters and decorative appliances for installation in vented solid fuel-burning fireplaces are installed in rooms that meet the required volume criteria of Section 304.5.
  3. A single wall-mounted unvented room heater is installed in a bathroom and such unvented room heater is equipped as specified in Section 621.6 and has an input rating not greater than 6,000 Btu/h (1.76 kW). The bathroom shall meet the required volume criteria of Section 304.5. 18
  4. A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section 621.6 and has an input rating not greater than 10,000 Btu/h (2.93 kW). The bedroom shall meet the required volume criteria of Section 304.5.
  5. The appliance is installed in a room or space that opens only into a bedroom or bathroom, and such room or space is used for no other purpose and is provided with a solid weather-stripped door equipped with an approved self-closing device. All combustion air shall be taken directly from the outdoors in accordance with Section 304.6.

303.4 Protection from vehicle impact damage. Appliances shall not be installed in a location subject to vehicle impact damage except where protected by an approved means.

303.5 Indoor locations. Furnaces and boilers installed in closets and alcoves shall be listed for such installation.

303.6 Outdoor locations. Appliances installed in outdoor locations shall be either listed for outdoor installation or provided with protection from outdoor environmental factors that influence the operability, durability and safety of the appliances.

303.7 Pit locations. Appliances installed in pits or excavations shall not come in direct contact with the surrounding soil. The sides of the pit or excavation shall be held back a minimum of 12 inches (305 mm) from the appliance. Where the depth exceeds 12 inches (305 mm) below adjoining grade, the walls of the pit or excavation shall be lined with concrete or masonry, such concrete or masonry shall extend a minimum of 4 inches (102 mm) above adjoining grade and shall have sufficient lateral load-bearing capacity to resist collapse. The appliance shall be protected from flooding in an approved manner.

SECTION 304 (IFGS)
COMBUSTION, VENTILATION AND DILUTION AIR

304.1 General. Air for combustion, ventilation and dilution of flue gases for appliances installed in buildings shall be provided by application of one of the methods prescribed in Sections 304.5 through 304.9. Where the requirements of Section 304.5 are not met, outdoor air shall be introduced in accordance with one of the methods prescribed in Sections 304.6 through 304.9. Direct-vent appliances, gas appliances of other than natural draft design and vented gas appliances other than Category 1 shall be provided with combustion, ventilation and dilution air in accordance with the appliance manufacturer’s instructions.

Exception: Type 1 clothes dryers that are provided with makeup air in accordance with Section 614.5.

304.2 Appliance location. Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation and dilution air.

304.3 Draft hood/regulator location. Where used, a draft hood or a barometric draft regulator shall be installed in the same room or enclosure as the appliance served so as to prevent any difference in pressure between the hood or regulator and the combustion air supply.

304.4 Makeup air provisions. Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.

304.5 Indoor combustion air. The required volume of indoor air shall be determined in accordance with Section 304.5.1 or 304.5.2, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), Section 304.5.2 shall be used. The total required volume shall be the sum of the required volume calculated for all appliances located within the space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with Section 304.5.3, are considered to be part of the required volume.

304.5.1 Standard method. The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW) of the appliance input rating.

304.5.2 Known air-infiltration-rate method. Where the air infiltration rate of a structure is known, the minimum required volume shall be determined as follows:

For appliances other than fan-assisted, calculate volume using Equation 3-1.

Image

For fan-assisted appliances, calculate volume using Equation 3-2.

Image

where:

Iother = All appliances other than fan assisted (input in Btu/h).

Ifan = Fan-assisted appliance (input in Btu/h).

ACH = Air change per hour (percent of volume of space exchanged per hour, expressed as a decimal).

For purposes of this calculation, an infiltration rate greater than 0.60 ACH shall not be used in Equations 3-1 and 3-2.

304.5.3 Indoor opening size and location. Openings used to connect indoor spaces shall be sized and located in accordance with Sections 304.5.3.1 and 304.5.3.2 (see Figure 304.5.3).

304.5.3.1 Combining spaces on the same story. Each opening shall have a minimum free area of 1 square inch per 1,000 Btu/h (2,200 mm2/kW) of the total input rating of all appliances in the space, but not less than 100 square inches (0.06 m2). One opening shall commence within 12 inches (305 mm) of the top and one opening shall commence within 12 inches (305 mm) of

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the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

304.5.3.2 Combining spaces in different stories. The volumes of spaces in different stories shall be considered as communicating spaces where such spaces are connected by one or more openings in doors or floors having a total minimum free area of 2 square inches per 1,000 Btu/h (4402 mm2/kW) of total input rating of all appliances.

304.6 Outdoor combustion air. Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with Section 304.6.1 or 304.6.2. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

304.6.1 Two-permanent-openings method. Two permanent openings, one commencing within 12 inches (305 mm) of the top and one commencing within 12 inches (305 mm) of the bottom of the enclosure, shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors.

Where directly communicating with the outdoors, or where communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu/h (550 mm2/kW) of total input rating of all appliances in the enclosure [see Figures 304.6.1(1) and 304.6.1(2)].

Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of not less than 1 square inch per 2,000 Btu/h (1,100 mm2/kW) of total input rating of all appliances in the enclosure [see Figure 304.6.1(3)].

FIGURE 304.5.3 ALL AIR FROM INSIDE THE BUILDING (see Section 304.5.3)

FIGURE 304.5.3
ALL AIR FROM INSIDE THE BUILDING (see Section 304.5.3)

FIGURE 304.6.1(1) ALL AIR FROM OUTDOORS—INLET AIR FROM VENTILATED CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC (see Section 304.6.1)

FIGURE 304.6.1(1)
ALL AIR FROM OUTDOORS—INLET AIR FROM VENTILATED CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC (see Section 304.6.1)

FIGURE 304.6.1(2) ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC (see Section 304.6.1)

FIGURE 304.6.1(2)
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC (see Section 304.6.1)

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304.6.2 One-permanent-opening method. One permanent opening, commencing within 12 inches (305 mm) of the top of the enclosure, shall be provided. The appliance shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (152 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or through a vertical or horizontal duct to the outdoors, or spaces that freely communicate with the outdoors (see Figure 304.6.2) and shall have a minimum free area of 1 square inch per 3,000 Btu/h (734 mm2/kW) of the total input rating of all appliances located in the enclosure and not less than the sum of the areas of all vent connectors in the space.

304.7 Combination indoor and outdoor combustion air. The use of a combination of indoor and outdoor combustion air shall be in accordance with Sections 304.7.1 through 304.7.3.

304.7.1 Indoor openings. Where used, openings connecting the interior spaces shall comply with Section 304.5.3.

304.7.2 Outdoor opening location. Outdoor opening(s) shall be located in accordance with Section 304.6.

304.7.3 Outdoor opening(s) size. The outdoor opening(s) size shall be calculated in accordance with the following:

  1. The ratio of interior spaces shall be the available volume of all communicating spaces divided by the required volume.
  2. The outdoor size reduction factor shall be one minus the ratio of interior spaces.
  3. The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with Section 304.6, multiplied by the reduction factor. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

FIGURE 304.6.1(3) ALL AIR FROM OUTDOORS (see Section 304.6.1)

FIGURE 304.6.1(3)
ALL AIR FROM OUTDOORS (see Section 304.6.1)

304.8 Engineered installations. Engineered combustion air installations shall provide an adequate supply of combustion, ventilation and dilution air and shall be approved.

304.9 Mechanical combustion air supply. Where all combustion air is provided by a mechanical air supply system, the combustion air shall be supplied from the outdoors at a rate not less than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 m3/min per kW) of total input rating of all appliances located within the space.

304.9.1 Makeup air. Where exhaust fans are installed, makeup air shall be provided to replace the exhausted air.

304.9.2 Appliance interlock. Each of the appliances served shall be interlocked with the mechanical air supply system to prevent main burner operation when the mechanical air supply system is not in operation.

304.9.3 Combined combustion air and ventilation air system. Where combustion air is provided by the building’s mechanical ventilation system, the system shall provide the specified combustion air rate in addition to the required ventilation air.

304.10 Louvers and grilles. The required size of openings for combustion, ventilation and dilution air shall be based on the net free area of each opening. Where the free area through a design of louver, grille or screen is known, it shall be used in calculating the size opening required to provide the free area specified. Where the design and free area of louvers and grilles are not known, it shall be assumed that wood louvers will have 25-percent free area and metal louvers and grilles will have 75-percent free area. Screens shall have a mesh size not smaller than ¼ inch (6.4 mm). Nonmotorized louvers and grilles shall be fixed in the open position. Motorized louvers

FIGURE 304.6.2 SINGLE COMBUSTION AIR OPENING, ALL AIR FROM THE OUTDOORS (see Section 304.6.2)

FIGURE 304.6.2
SINGLE COMBUSTION AIR OPENING, ALL AIR FROM THE OUTDOORS (see Section 304.6.2)

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shall be interlocked with the appliance so that they are proven to be in the full open position prior to main burner ignition and during main burner operation. Means shall be provided to prevent the main burner from igniting if the louvers fail to open during burner start-up and to shut down the main burner if the louvers close during operation.

304.11 Combustion air ducts. Combustion air ducts shall comply with all of the following:

  1. Ducts shall be constructed of galvanized steel complying with Chapter 6 of the International Mechanical Code or of a material having equivalent corrosion resistance, strength and rigidity.

    Exception: Within dwellings units, unobstructed stud and joist spaces shall not be prohibited from conveying combustion air, provided that not more than one required fireblock is removed.

  2. Ducts shall terminate in an unobstructed space allowing free movement of combustion air to the appliances.
  3. Ducts shall serve a single enclosure.
  4. Ducts shall not serve both upper and lower combustion air openings where both such openings are used. The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air.
  5. Ducts shall not be screened where terminating in an attic space.
  6. Horizontal upper combustion air ducts shall not slope downward toward the source of combustion air.
  7. The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air.

    Exception: Direct-vent gas-fired appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the manufacturer’s instructions.

  8. Combustion air intake openings located on the exterior of a building shall have the lowest side of such openings located not less than 12 inches (305 mm) vertically from the adjoining finished ground level.

304.12 Protection from fumes and gases. Where corrosive or flammable process fumes or gases, other than products of combustion, are present, means for the disposal of such fumes or gases shall be provided. Such fumes or gases include carbon monoxide, hydrogen sulfide, ammonia, chlorine and halogenated hydrocarbons.

In barbershops, beauty shops and other facilities where chemicals that generate corrosive or flammable products, such as aerosol sprays, are routinely used, nondirect vent-type appliances shall be located in a mechanical room separated or partitioned off from other areas with provisions for combustion air and dilution air from the outdoors. Direct-vent appliances shall be installed in accordance with the appliance manufacturer’s installation instructions.

SECTION 305 (IFGC)
INSTALLATION

305.1 General. Equipment and appliances shall be installed as required by the terms of their approval, in accordance with the conditions of listing, the manufacturer’s instructions and this code. Manufacturers’ installation instructions shall be available on the job site at the time of inspection. Where a code provision is less restrictive than the conditions of the listing of the equipment or appliance or the manufacturer’s installation instructions, the conditions of the listing and the manufacturer’s installation instructions shall apply.

Unlisted appliances approved in accordance with Section 301.3 shall be limited to uses recommended by the manufacturer and shall be installed in accordance with the manufacturer’s instructions, the provisions of this code and the requirements determined by the code official.

305.2 Hazardous area. Equipment and appliances having an ignition source shall not be installed in Group H occupancies or control areas where open use, handling or dispensing of combustible, flammable or explosive materials occurs.

305.3 Elevation of ignition source. Equipment and appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457 mm) above the floor in hazardous locations and public garages, private garages, repair garages, motor fuel-dispensing facilities and parking garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate directly with a private garage through openings shall be considered to be part of the private garage.

Exception: Elevation of the ignition source is not required for appliances that are listed as flammable vapor ignition resistant.

305.3.1 (IFGS) Installation in residential garages. In residential garages where appliances are installed in a separate, enclosed space having access only from outside of the garage, such appliances shall be permitted to be installed at floor level, provided that the required combustion air is taken from the exterior of the garage.

305.3.2 Parking garages. Connection of a parking garage with any room in which there is a fuel-fired appliance shall be by means of a vestibule providing a two-doorway separation, except that a single door is permitted where the sources of ignition in the appliance are elevated in accordance with Section 305.3.

Exception: This section shall not apply to appliance installations complying with Section 305.4.

305.4 Public garages. Appliances located in public garages, motor fuel-dispensing facilities, repair garages or other areas frequented by motor vehicles shall be installed a minimum of 8 feet (2438 mm) above the floor. Where motor vehicles are capable of passing under an appliance, the appliance shall be installed at the clearances required by the appliance manufacturer and not less than 1 foot (305 mm) higher than the tallest vehicle garage door opening.

Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle

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impact and installed in accordance with Section 305.3 and NFPA 30A.

305.5 Private garages. Appliances located in private garages shall be installed with a minimum clearance of 6 feet (1829 mm) above the floor.

Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section 305.3.

305.6 Construction and protection. Boiler rooms and furnace rooms shall be protected as required by the International Building Code.

305.7 Clearances from grade. Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than 3-inches (76 mm) above adjoining grade or shall be suspended not less than 6 inches (152 mm) above adjoining grade. Such supports shall be installed in accordance with the manufacturer’s installation instructions.

305.8 Clearances to combustible construction. Heat-producing equipment and appliances shall be installed to maintain the required clearances to combustible construction as specified in the listing and manufacturer’s instructions. Such clearances shall be reduced only in accordance with Section 308. Clearances to combustibles shall include such considerations as door swing, drawer pull, overhead projections or shelving and window swing. Devices, such as door stops or limits and closers, shall not be used to provide the required clearances.

305.9 (IFGS) Parking structures. Appliances installed in enclosed, basement and underground parking structures shall be installed in accordance with NFPA 88A.

305.10 (IFGS) Repair garages. Appliances installed in repair garages shall be installed in a detached building or room, separated from repair areas by walls or partitions, floors or floor-ceiling assemblies that are constructed so as to prohibit the transmission of vapors and having a fire-resistance rating of not less than 1 hour, and that have no openings in the wall separating the repair area within 8 feet (2438 mm) of the floor. Wall penetrations shall be firestopped. Air for combustion purposes shall be obtained from the outdoors. The appliance room shall not be used for the storage of combustible materials.

Exceptions:

  1. Overhead heaters where installed not less than 8 feet (2438 mm) above the floor shall be permitted.
  2. Heating appliances for vehicle repair areas where there is no dispensing or transferring of Class I or II flammable or combustible liquids or liquefied petroleum gas shall be installed in accordance with NFPA 30A.

305.11 (IFGS) Installation in aircraft hangars. Heaters in aircraft hangars shall be installed in accordance with NFPA 409.

305.12 (IFGS) Avoid strain on gas piping. Appliances shall be supported and connected to the piping so as not to exert undue strain on the connections.

SECTION 306 (IFGC)
ACCESS AND SERVICE SPACE

[M] 306.1 Access for maintenance and replacement. Appliances shall be accessible for inspection, service, repair and replacement without disabling the function of a fire-resistance-rated assembly or removing permanent construction, other appliances, or any other piping or ducts not connected to the appliance being inspected, serviced, repaired or replaced. A level working space at least 30 inches deep and 30 inches wide (762 mm by 762 mm) shall be provided in front of the control side to service an appliance.

[M] 306.2 Appliances in rooms. Rooms containing appliances shall be provided with a door and an unobstructed passageway measuring not less than 36 inches (914 mm) wide and 80 inches (2032 mm) high.

Exception: Within a dwelling unit, appliances installed in a compartment, alcove, basement or similar space shall be provided with access by an opening or door and an unobstructed passageway measuring not less than 24 inches (610 mm) wide and large enough to allow removal of the largest appliance in the space, provided that a level service space of not less than 30 inches (762 mm) deep and the height of the appliance, but not less than 30 inches (762 mm), is present at the front or service side of the appliance with the door open.

[M] 306.3 Appliances in attics. Attics containing appliances shall be provided with an opening and unobstructed passageway large enough to allow removal of the largest appliance. The passageway shall not be less than 30 inches (762 mm) high and 22 inches (559 mm) wide and not more than 20 feet (6096 mm) in length measured along the centerline of the passageway from the opening to the appliance. The passageway shall have continuous solid flooring not less than 24 inches (610 mm) wide. A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. The clear access opening dimensions shall be a minimum of 20 inches by 30 inches (508 mm by 762 mm), and large enough to allow removal of the largest appliance.

Exceptions:

  1. The passageway and level service space are not required where the appliance is capable of being serviced and removed through the required opening.
  2. Where the passageway is not less than 6 feet (1829 mm) high for its entire length, the passageway shall be not greater than 50 feet (15 250 mm) in length.

[M] 306.3.1 Electrical requirements. A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or near the appliance location in accordance with NFPA 70.

[M] 306.4 Appliances under floors. Under-floor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest appliance. The passageway shall not be less than 30 inches (762 mm) high and 22 inches (559 mm) wide, nor more than 20 feet (6096 mm) in length measured along the centerline of the passageway from the opening to the appliance.

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A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. If the depth of the passageway or the service space exceeds 12 inches (305 mm) below the adjoining grade, the walls of the passageway shall be lined with concrete or masonry extending 4 inches (102 mm) above the adjoining grade and having sufficient lateral-bearing capacity to resist collapse. The clear access opening dimensions shall be a minimum of 22 inches by 30 inches (559 mm by 762 mm), and large enough to allow removal of the largest appliance.

Exceptions:

  1. The passageway is not required where the level service space is present when the access is open and the appliance is capable of being serviced and removed through the required opening.
  2. Where the passageway is not less than 6 feet high (1829 mm) for its entire length, the passageway shall not be limited in length.

[M] 306.4.1 Electrical requirements. A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be provided at or near the appliance location in accordance with NFPA 70.

[M] 306.5 Equipment and appliances on roofs or elevated structures. Where equipment requiring access or appliances are located on an elevated structure or the roof of a building such that personnel will have to climb higher than 16 feet (4877 mm) above grade to access such equipment or appliances, an interior or exterior means of access shall be provided. Such access shall not require climbing over obstructions greater than 30 inches (762 mm) in height or walking on roofs having a slope greater than 4 units vertical in 12 units horizontal (33-percent slope). Such access shall not require the use of portable ladders.

Permanent ladders installed to provide the required access shall comply with the following minimum design criteria:

  1. The side railing shall extend above the parapet or roof edge not less than 30 inches (762 mm).
  2. Ladders shall have rung spacing not to exceed 14 inches (356 mm) on center. The upper-most rung shall be a maximum of 24 inches (610 mm) below the upper edge of the roof hatch, roof or parapet, as applicable.
  3. Ladders shall have a toe spacing not less than 6 inches (152 mm) deep.
  4. There shall be a minimum of 18 inches (457 mm) between rails.
  5. Rungs shall have a minimum 0.75-inch. (19 mm) diameter and be capable of withstanding a 300-pound (136.1 kg) load.
  6. Ladders over 30 feet (9144 mm) in height shall be provided with offset sections and landings capable of withstanding 100 pounds per square foot (488.2 kg/m2). Landing dimensions shall be not less than 18 inches (457 mm) and not less than the width of the ladder served. A guard rail shall be provided on all open sides of the landing.
  7. Climbing clearance. The distance from the centerline of the rungs to the nearest permanent object on the climbing side of the ladder shall be a minimum of 30 inches (762 mm) measured perpendicular to the rungs. This distance shall be maintained from the point of ladder access to the bottom of the roof hatch. A minimum clear width of 15 inches (381 mm) shall be provided on both sides of the ladder measured from the midpoint of and parallel with the rungs except where cages or wells are installed.
  8. Landing required. The ladder shall be provided with a clear and unobstructed bottom landing area having a minimum dimension of 30 inches (762 mm) by 30 inches (762 mm) centered in front of the ladder.
  9. Ladders shall be protected against corrosion by approved means.
  10. Access to ladders shall be provided at all times.

Catwalks installed to provide the required access shall be not less than 24 inches (610 mm) wide and shall have railings as required for service platforms.

Exception: This section shall not apply to Group R-3 occupancies.

[M] 306.5.1 Sloped roofs. Where appliances, equipment, fans or other components that require service are installed on a roof having a slope of 3 units vertical in 12 units horizontal (25-percent slope) or greater and having an edge more than 30 inches (762 mm) above grade at such edge, a level platform shall be provided on each side of the appliance or equipment to which access is required for service, repair or maintenance. The platform shall be not less than 30 inches (762 mm) in any dimension and shall be provided with guards. The guards shall extend not less than 42 inches (1067 mm) above the platform, shall be constructed so as to prevent the passage of a 21-inch-diameter (533 mm) sphere and shall comply with the loading requirements for guards specified in the International Building Code. Access shall not require walking on roofs having a slope greater than 4 units vertical in 12 units horizontal (33-percent slope). Where access involves obstructions greater than 30 inches (762 mm) in height, such obstructions shall be provided with ladders installed in accordance with Section 306.5 or stairs installed in accordance with the requirements specified in the International Building Code in the path of travel to and from appliances, fans or equipment requiring service.

[M] 306.5.2 Electrical requirements. A receptacle outlet shall be provided at or near the appliance location in accordance with NFPA 70.

[M] 306.6 Guards. Guards shall be provided where appliances or other components that require service and roof hatch openings are located within 10 feet (3048 mm) of a roof edge or open side of a walking surface and such edge or open side is located more than 30 inches (762 mm) above the floor, roof or grade below. The guard shall extend not less than 30 inches (762 mm) beyond each end of such appliances, components and roof hatch openings and the top of the guard

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shall be located not less than 42 inches (1067 mm) above the elevated surface adjacent to the guard. The guard shall be constructed so as to prevent the passage of a 21-inch-diameter (533 mm) sphere and shall comply with the loading requirements for guards specified in the International Building Code.

SECTION 307 (IFGC)
CONDENSATE DISPOSAL

307.1 Evaporators and cooling coils. Condensate drainage systems shall be provided for equipment and appliances containing evaporators and cooling coils in accordance with the International Mechanical Code.

307.2 Fuel-burning appliances. Liquid combustion byproducts of condensing appliances shall be collected and discharged to an approved plumbing fixture or disposal area in accordance with the manufacturer’s installation instructions. Condensate piping shall be of approved corrosion-resistant material and shall not be smaller than the drain connection on the appliance. Such piping shall maintain a minimum slope in the direction of discharge of not less than one-eighth unit vertical in 12 units horizontal (1-percent slope).

[M] 307.3 Drain pipe materials and sizes. Components of the condensate disposal system shall be cast iron, galvanized steel, copper, cross-linked polyethylene, polybutylene, polyethylene, ABS, CPVC or PVC pipe or tubing. All components shall be selected for the pressure and temperature rating of the installation. Joints and connections shall be made in accordance with the applicable provisions of Chapter 7 of the International Plumbing Code relative to the material type. Condensate waste and drain line size shall be not less than ¾-inch (19 mm) internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with an approved method.

307.4 Traps. Condensate drains shall be trapped as required by the equipment or appliance manufacturer.

307.5 Auxiliary drain pan. Category IV condensing appliances shall be provided with an auxiliary drain pan where damage to any building component will occur as a result of stoppage in the condensate drainage system. Such pan shall be installed in accordance with the applicable provisions of Section 307 of the International Mechanical Code.

Exception: An auxiliary drain pan shall not be required for appliances that automatically shut down operation in the event of a stoppage in the condensate drainage system.

SECTION 308 (IFGS)
CLEARANCE REDUCTION

308.1 Scope. This section shall govern the reduction in required clearances to combustible materials, including gypsum board, and combustible assemblies for chimneys, vents, appliances, devices and equipment. Clearance requirements for air-conditioning equipment and central heating boilers and furnaces shall comply with Sections 308.3 and 308.4.

308.2 Reduction table. The allowable clearance reduction shall be based on one of the methods specified in Table 308.2 or shall utilize an assembly listed for such application. Where required clearances are not listed in Table 308.2, the reduced clearances shall be determined by linear interpolation between the distances listed in the table. Reduced clearances shall not be derived by extrapolation below the range of the table. The reduction of the required clearances to combustibles for listed and labeled appliances and equipment shall be in accordance with the requirements of this section except that such clearances shall not be reduced where reduction is specifically prohibited by the terms of the appliance or equipment listing [see Figures 308.2(1) through 308.2(3)].

308.3 Clearances for indoor air-conditioning appliances. Clearance requirements for indoor air-conditioning appliances shall comply with Sections 308.3.1 through 308.3.4.

308.3.1 Appliance clearances. Air-conditioning appliances shall be installed with clearances in accordance with the manufacturer’s instructions.

308.3.2 Clearance reduction. Air-conditioning appliances shall be permitted to be installed with reduced clearances to combustible material, provided that the combustible material or appliance is protected as described in Table 308.2 and such reduction is allowed by the manufacturer’s instructions.

308.3.3 Plenum clearances. Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.

308.3.4 Clearance from supply ducts. Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.

308.4 Central-heating boilers and furnaces. Clearance requirements for central-heating boilers and furnaces shall comply with Sections 308.4.1 through 308.4.5. The clearance to these appliances shall not interfere with combustion air; draft hood clearance and relief; and accessibility for servicing.

308.4.1 Appliance clearances. Central-heating furnaces and low-pressure boilers shall be installed with clearances in accordance with the manufacturer’s instructions.

308.4.2 Clearance reduction. Central-heating furnaces and low-pressure boilers shall be permitted to be installed with reduced clearances to combustible material provided that the combustible material or appliance is protected as described in Table 308.2 and such reduction is allowed by the manufacturer’s instructions.

308.4.3 Clearance for servicing appliances. Front clearance shall be sufficient for servicing the burner and the furnace or boiler.

308.4.4 Plenum clearances. Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material

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attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.

308.4.5 Clearance from supply ducts. Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.

TABLE 308.2
a through k
REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION
TYPE OF PROTECTION APPLIED TO AND COVERING ALL SURFACES OF COMBUSTIBLE MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE REQUIRED CLEARANCE WITH NO PROTECTION [see Figures 308.2(1), 308.2(2), and 308.2(3)] WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM APPLIANCE, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (inches)
36 18 12 9 6
Allowable clearances with specified protection (inches)
Use Column 1 for clearances above appliance or horizontal connector. Use Column 2 for clearances from appliance, vertical connector and single-wall metal pipe.
Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2 Above Col. 1 Sides and rear Col. 2
1. 3½-inch-thick masonry wall without ventilated airspace 24 12 9 6 5
2. ½-inch insulation board over 1-inch glass fiber or mineral wool batts 24 18 12 9 9 6 6 5 4 3
3. 0.024-inch (nominal 24 gage) sheet metal over 1-inch glass fiber or mineral wool batts reinforced with wire on rear face with ventilated airspace 18 12 9 6 6 4 5 3 3 3
4. 3½-inch-thick masonry wall with ventilated airspace 12 6 6 6 6
5. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 2
6. ½-inch-thick insulation board with ventilated airspace 18 12 9 6 6 4 5 3 3 3
7. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace over 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 3
8. 1-inch glass fiber or mineral wool batts sandwiched between two sheets 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace 18 12 9 6 6 4 5 3 3 3
For SI: 1 inch = 25.4 mm, °C = [(°F − 32)/l .8], 1 pound per cubic foot = 16.02 kg/m3, 1 Btu per inch per square foot per hour per °F = 0.144 W/m2 · K.
  1. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing.
  2. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any intervening protection applied to the combustible material.
  3. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector.
  4. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures 308.2(2) and 308.2(3)].
  5. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace.
  6. Where a wall protector is mounted on a single flat wall away from corners, it shall have a minimum 1-inch air gap. To provide air circulation, the bottom and top edges, or only the side and top edges, or all edges shall be left open.
  7. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1500°F.
  8. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less.
  9. There shall be at least 1 inch between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced below that allowed in this table.
  10. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable.
  11. Listed single-wall connectors shall be installed in accordance with the manufacturer’s installation instructions.

SECTION 309 (IFGC)
ELECTRICAL

309.1 Grounding. Gas piping shall not be used as a grounding electrode.

309.2 Connections. Electrical connections between appliances and the building wiring, including the grounding of the appliances, shall conform to NFPA 70.

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FIGURE 308.2(1) EXTENT OF PROTECTION NECESSARY TO REDUCE CLEARANCES FROM APPLIANCE FOR VENT CONNECTIONS

FIGURE 308.2(1)
EXTENT OF PROTECTION NECESSARY TO REDUCE CLEARANCES FROM APPLIANCE FOR VENT CONNECTIONS

FIGURE 308.2(2) WALL PROTECTOR CLEARANCE REDUCTION SYSTEM

FIGURE 308.2(2)
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM

FIGURE 308.2(3) MASONRY CLEARANCE REDUCTION SYSTEM

FIGURE 308.2(3)
MASONRY CLEARANCE REDUCTION SYSTEM

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SECTION 310 (IFGS)
ELECTRICAL BONDING

310.1 Pipe and tubing other than CSST. Each above-ground portion of a gas piping system other than corrugated stainless steel tubing (CSST) that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping other than CSST shall be considered to be bonded where it is connected to appliances that are connected to the equipment grounding conductor of the circuit supplying that appliance.

310.1.1 CSST. Corrugated stainless steel tubing (CSST) gas piping systems shall be bonded to the electrical service grounding electrode system. The bonding jumper shall connect to a metallic pipe or fitting between the point of delivery and the first downstream CSST fitting. The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent. Gas piping systems that contain one or more segments of CSST shall be bonded in accordance with this section.

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CHAPTER 4
GAS PIPING INSTALLATIONS

SECTION 401 (IFGC)
GENERAL

401.1 Scope. This chapter shall govern the design, installation, modification and maintenance of piping systems. The applicability of this code to piping systems extends from the point of delivery to the connections with the appliances and includes the design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance of such piping systems.

401.1.1 Utility piping systems located within buildings. Utility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisions of the International Building Code.

401.2 Liquefied petroleum gas storage. The storage system for liquefied petroleum gas shall be designed and installed in accordance with the International Fire Code and NFPA 58.

401.3 Modifications to existing systems. In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.

401.4 Additional appliances. Where an additional appliance is to be served, the existing piping shall be checked to determine if it has adequate capacity for all appliances served. If inadequate, the existing system shall be enlarged as required or separate piping of adequate capacity shall be provided.

401.5 Identification. For other than steel pipe, exposed piping shall be identified by a yellow label marked “Gas” in black letters. The marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on pipe located in the same room as the appliance served.

401.6 Interconnections. Where two or more meters are installed on the same premises but supply separate consumers, the piping systems shall not be interconnected on the outlet side of the meters.

401.7 Piping meter identification. Piping from multiple meter installations shall be marked with an approved permanent identification by the installer so that the piping system supplied by each meter is readily identifiable.

401.8 Minimum sizes. All pipe utilized for the installation, extension and alteration of any piping system shall be sized to supply the full number of outlets for the intended purpose and shall be sized in accordance with Section 402.

401.9 Identification. Each length of pipe and tubing and each pipe fitting, utilized in a fuel gas system, shall bear the identification of the manufacturer.

401.10 Third-party testing and certification. All piping, tubing and fittings shall comply with the applicable referenced standards, specifications and performance criteria of this code and shall be identified in accordance with Section 401.9. Piping, tubing and fittings shall either be tested by an approved third-party testing agency or certified by an approved third-party certification agency.

SECTION 402 (IFGS)
PIPE SIZING

402.1 General considerations. Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.

402.2 Maximum gas demand. The volumetric flow rate of gas to be provided, in cubic feet per hour, shall be calculated using the manufacturer’s input ratings of the appliances served adjusted for altitude. Where an input rating is not indicated, the gas supplier, appliance manufacturer or a qualified agency shall be contacted, or the rating from Table 402.2 shall be used for estimating the volumetric flow rate of gas to be supplied.

The total connected hourly load shall be used as the basis for pipe sizing, assuming that all appliances could be operating at full capacity simultaneously. Where a diversity of load can be established, pipe sizing shall be permitted to be based on such loads.

402.3 Sizing. Gas piping shall be sized in accordance with one of the following:

  1. Pipe sizing tables or sizing equations in accordance with Section 402.4.
  2. The sizing tables included in a listed piping system’s manufacturer’s installation instructions.
  3. Other approved engineering methods.

402.4 Sizing tables and equations. Where Tables 402.4(1) through 402.4(35) are used to size piping or tubing, the pipe length shall be determined in accordance with Section 402.4.1, 402.4.2 or 402.4.3.

Where Equations 4-1 and 4-2 are used to size piping or tubing, the pipe or tubing shall have smooth inside walls and the pipe length shall be determined in accordance with Section 402.4.1, 402.4.2 or 402.4.3.

  1. Low-pressure gas equation [Less than 1 ½ pounds per square inch (psi) (10.3 kPa)]:

    Image

    29
  2. High-pressure gas equation [l ½ psi (10.3 kPa) and above]:

    Image

where:

D = Inside diameter of pipe, inches (mm).

Q = Input rate appliance(s), cubic feet per hour at 60°F (16°C) and 30-inch mercury column.

P1 = Upstream pressure, psia (P1 + 14.7).

P2 = Downstream pressure, psia (P2 + 14.7).

L = Equivalent length of pipe, feet.

ΔH = Pressure drop, inch water column (27.7 inch water column = 1 psi).

TABLE 402.4
C AND Y VALUES FOR NATURAL GAS AND UNDILUTED PROPANE AT STANDARD CONDITIONS
GAS EQUATION FACTORS
Cr Y
Natural gas 0.6094 0.9992
Undiluted propane 1.2462 0.9910
For SI: 1 cubic foot = 0.028 m3,
            1 foot = 305 mm, 1-inch water column = 0.2488 kPa,
            1 pound per square inch = 6.895 kPa,
            1 British thermal unit per hour = 0.293 W.

402.4.1 Longest length method. The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section.

402.4.2 Branch length method. Pipe shall be sized as follows:

  1. Pipe size of each section of the longest pipe run from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section.
  2. The pipe size of each section of branch piping not previously sized shall be determined using the length of piping from the point of delivery to the most remote outlet in each branch and the load of the section.

402.4.3 Hybrid pressure. The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.

TABLE 402.2
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES
APPLIANCE INPUT BTU/H (Approx.)
Space Heating Units  
   Hydronic boiler  
      Single family 100,000
      Multifamily, per unit 60,000
   Warm-air furnace  
      Single family 100,000
      Multifamily, per unit 60,000
Space and Water Heating Units  
   Hydronic boiler  
      Single family 120,000
      Multifamily, per unit 75,000
Water Heating Appliances  
   Water heater, automatic instantaneous  
      Capacity at 2 gal./minute 142,800
      Capacity at 4 gal./minute 285,000
      Capacity at 6 gal./minute 428,400
   Water heater, automatic storage, 30- to 40-gal, tank 35,000
   Water heater, automatic storage, 50-gal, tank 50,000
   Water heater, domestic, circulating or side-arm 35,000
Cooking Appliances  
   Built-in oven or broiler unit, domestic 25,000
   Built-in top unit, domestic 40,000
   Range, free-standing, domestic 65,000
Other Appliances  
   Barbecue 40,000
   Clothes dryer, Type 1 (domestic) 35,000
   Gas fireplace, direct-vent 40,000
   Gas light 2,500
   Gas log 80,000
   Refrigerator 3,000
For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L,
             1 gallon per minute = 3.785 L/m.

402.5 Allowable pressure drop. The design pressure loss in any piping system under maximum probable flow conditions, from the point of delivery to the inlet connection of the appliance, shall be such that the supply pressure at the appliance is greater than or equal to the minimum pressure required by the appliance.

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TABLE 402.4(1)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4 5 6 8 10 12
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 11.938
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 131 273 514 1,060 1,580 3,050 4,860 8,580 17,500 31,700 51,300 105,000 191,000 303,000
20 90 188 353 726 1,090 2,090 3,340 5,900 12,000 21,800 35,300 72,400 132,000 208,000
30 72 151 284 583 873 1,680 2,680 4,740 9,660 17,500 28,300 58,200 106,000 167,000
40 62 129 243 499 747 1,440 2,290 4,050 8,270 15,000 24,200 49,800 90,400 143,000
50 55 114 215 442 662 1,280 2,030 3,590 7,330 13,300 21,500 44,100 80,100 127,000
60 50 104 195 400 600 1,160 1,840 3,260 6,640 12,000 19,500 40,000 72,600 115,000
70 46 95 179 368 552 1,060 1,690 3,000 6,110 11,100 17,900 36,800 66,800 106,000
80 42 89 167 343 514 989 1,580 2,790 5,680 10,300 16,700 34,200 62,100 98,400
90 40 83 157 322 482 928 1,480 2,610 5,330 9,650 15,600 32,100 58,300 92,300
100 38 79 148 304 455 877 1,400 2,470 5,040 9,110 14,800 30,300 55,100 87,200
125 33 70 131 269 403 777 1,240 2,190 4,460 8,080 13,100 26,900 48,800 77,300
150 30 63 119 244 366 704 1,120 1,980 4,050 7,320 11,900 24,300 44,200 70,000
175 28 58 109 224 336 648 1,030 1,820 3,720 6,730 10,900 22,400 40,700 64,400
200 26 54 102 209 313 602 960 1,700 3,460 6,260 10,100 20,800 37,900 59,900
250 23 48 90 185 277 534 851 1,500 3,070 5,550 8,990 18,500 33,500 53,100
300 21 43 82 168 251 484 771 1,360 2,780 5,030 8,150 16,700 30,400 48,100
350 19 40 75 154 231 445 709 1,250 2,560 4,630 7,490 15,400 28,000 44,300
400 18 37 70 143 215 414 660 1,170 2,380 4,310 6,970 14,300 26,000 41,200
450 17 35 66 135 202 389 619 1,090 2,230 4,040 6,540 13,400 24,400 38,600
500 16 33 62 127 191 367 585 1,030 2,110 3,820 6,180 12,700 23,100 36,500
550 15 31 59 121 181 349 556 982 2,000 3,620 5,870 12,100 21,900 34,700
600 14 30 56 115 173 333 530 937 1,910 3,460 5,600 11,500 20,900 33,100
650 14 29 54 110 165 318 508 897 1,830 3,310 5,360 11,000 20,000 31,700
700 13 27 52 106 159 306 488 862 1,760 3,180 5,150 10,600 19,200 30,400
750 13 26 50 102 153 295 470 830 1,690 3,060 4,960 10,200 18,500 29,300
800 12 26 48 99 148 285 454 802 1,640 2,960 4,790 9,840 17,900 28,300
850 12 25 46 95 143 275 439 776 1,580 2,860 4,640 9,530 17,300 27,400
900 11 24 45 93 139 267 426 752 1,530 2,780 4,500 9,240 16,800 26,600
950 11 23 44 90 135 259 413 731 1,490 2,700 4,370 8,970 16,300 25,800
1,000 11 23 43 87 131 252 402 711 1,450 2,620 4,250 8,720 15,800 25,100
1,100 10 21 40 83 124 240 382 675 1,380 2,490 4,030 8,290 15,100 23,800
1,200 NA 20 39 79 119 229 364 644 1,310 2,380 3,850 7,910 14,400 22,700
1,300 NA 20 37 76 114 219 349 617 1,260 2,280 3,680 7,570 13,700 21,800
1,400 NA 19 35 73 109 210 335 592 1,210 2,190 3,540 7,270 13,200 20,900
1,500 NA 18 34 70 105 203 323 571 1,160 2,110 3,410 7,010 12,700 20,100
1,600 NA 18 33 68 102 196 312 551 1,120 2,030 3,290 6,770 12,300 19,500
1,700 NA 17 32 66 98 189 302 533 1,090 1,970 3,190 6,550 11,900 18,800
1,800 NA 16 31 64 95 184 293 517 1,050 1,910 3,090 6,350 11,500 18,300
1,900 NA 16 30 62 93 178 284 502 1,020 1,850 3,000 6,170 11,200 17,700
2,000 NA 16 29 60 90 173 276 488 1,000 1,800 2,920 6,000 10,900 17,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. NA means a How of less than 10 cfh.
  2. 2. All table entries have been rounded to three significant digits. 31

 

TABLE 402.4(2)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. w.c.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4 5 6 8 10 12
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026 5.047 6.065 7.981 10.020 11.938
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 172 360 678 1,390 2,090 4,020 6,400 11,300 23,100 41,800 67,600 139,000 252,000 399,000
20 118 247 466 957 l ,430 2,760 4,400 7,780 15,900 28,700 46,500 95,500 173,000 275,000
30 95 199 374 768 1,150 2,220 3,530 6,250 12,700 23,000 37,300 76,700 139,000 220,000
40 81 170 320 657 985 1,900 3,020 5,350 10,900 19,700 31,900 65,600 119,000 189,000
50 72 151 284 583 873 1,680 2,680 4,740 9,660 17,500 28,300 58,200 106,000 167,000
60 65 137 257 528 791 1,520 2,430 4,290 8,760 15,800 25,600 52,700 95,700 152,000
70 60 126 237 486 728 1,400 2,230 3,950 8,050 14,600 23,600 48,500 88,100 139,000
80 56 117 220 452 677 1,300 2,080 3,670 7,490 13,600 22,000 45,100 81,900 130,000
90 52 110 207 424 635 1,220 1,950 3,450 7,030 12,700 20,600 42,300 76,900 122,000
100 50 104 195 400 600 1,160 1,840 3,260 6,640 12,000 19,500 40,000 72,600 115,000
125 44 92 173 355 532 1,020 1,630 2,890 5,890 10,600 17,200 35,400 64,300 102,000
150 40 83 157 322 482 928 1,480 2,610 5,330 9,650 15,600 32,100 58,300 92,300
175 37 77 144 296 443 854 1,360 2,410 4,910 8,880 14,400 29,500 53,600 84,900
200 34 71 134 275 412 794 1,270 2,240 4,560 8,260 13,400 27,500 49,900 79,000
250 30 63 119 244 366 704 1,120 1,980 4,050 7,320 11,900 24,300 44,200 70,000
300 27 57 108 221 331 638 1,020 1,800 3,670 6,630 10,700 22,100 40,100 63,400
350 25 53 99 203 305 587 935 1,650 3,370 6,100 9,880 20,300 36,900 58,400
400 23 49 92 189 283 546 870 1,540 3,140 5,680 9,190 18,900 34,300 54,300
450 22 46 86 177 266 512 816 1,440 2,940 5,330 8,620 17,700 32,200 50,900
500 21 43 82 168 251 484 771 1,360 2,780 5,030 8,150 16,700 30,400 48,100
550 20 41 78 159 239 459 732 1,290 2,640 4,780 7,740 15,900 28,900 45,700
600 19 39 74 152 228 438 699 1,240 2,520 4,560 7,380 15,200 27,500 43,600
650 18 38 71 145 218 420 669 1,180 2,410 4,360 7,070 14,500 26,400 41,800
700 17 36 68 140 209 403 643 1,140 2,320 4,190 6,790 14,000 25,300 40,100
750 17 35 66 135 202 389 619 1,090 2,230 4,040 6,540 13,400 24,400 38,600
800 16 34 63 130 195 375 598 1,060 2,160 3,900 6,320 13,000 23,600 37,300
850 16 33 61 126 189 363 579 1,020 2,090 3,780 6,110 12,600 22,800 36,100
900 15 32 59 122 183 352 561 992 2,020 3,660 5,930 12,200 22,100 35,000
950 15 31 58 118 178 342 545 963 1,960 3,550 5,760 11,800 21,500 34,000
1,000 14 30 56 115 173 333 530 937 1,910 3,460 5,600 11,500 20,900 33,100
1,100 14 28 53 109 164 316 503 890 1,810 3,280 5,320 10,900 19,800 31,400
1,200 13 27 51 104 156 301 480 849 1,730 3,130 5,070 10,400 18,900 30,000
1,300 12 26 49 100 150 289 460 813 1,660 3,000 4,860 9,980 18,100 28,700
1,400 12 25 47 96 144 277 442 781 1,590 2,880 4,670 9,590 17,400 27,600
1,500 11 24 45 93 139 267 426 752 1,530 2,780 4,500 9,240 16,800 26,600
1,600 11 23 44 89 134 258 411 727 1,480 2,680 4,340 8,920 16,200 25,600
1,700 11 22 42 86 130 250 398 703 1,430 2,590 4,200 8,630 15,700 24,800
1,800 10 22 41 84 126 242 386 682 1,390 2,520 4,070 8,370 15,200 24,100
1,900 10 21 40 81 122 235 375 662 1,350 2,440 3,960 8,130 14,800 23,400
2,000 NA 20 39 79 119 229 364 644 1,310 2,380 3,850 7,910 14,400 22,700
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits. 32
TABLE 402.4(3)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 3.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 8.0 inches w.c. or greater
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 454 949 1,787 3,669 5,497 10,588 16,875 29,832 43,678
20 312 652 1,228 2,522 3,778 7,277 11,598 20,503 30,020
30 250 524 986 2,025 3,034 5,844 9,314 16,465 24,107
40 214 448 844 1,733 2,597 5,001 7,971 14,092 20,632
50 190 397 748 1,536 2,302 4,433 7,065 12,489 18,286
60 172 360 678 1,392 2,085 4,016 6,401 11,316 16,569
70 158 331 624 1,280 1,919 3,695 5,889 10,411 15,243
80 147 308 580 1,191 1,785 3,437 5,479 9,685 14,181
90 138 289 544 1,118 1,675 3,225 5,140 9,087 13,305
100 131 273 514 1,056 1,582 3,046 4,856 8,584 12,568
125 116 242 456 936 1,402 2,700 4,303 7,608 11,139
150 105 219 413 848 1,270 2,446 3,899 6,893 10,092
175 96 202 380 780 1,169 2,251 3,587 6,342 9,285
200 90 188 353 726 1,087 2,094 3,337 5,900 8,638
250 80 166 313 643 964 1,856 2,958 5,229 7,656
300 72 151 284 583 873 1,681 2,680 4,738 6,937
350 66 139 261 536 803 1,547 2,456 4,359 6,382
400 62 129 243 499 747 1,439 2,294 4,055 5,937
450 58 121 228 468 701 1,350 2,152 3,804 5,570
500 55 114 215 442 662 1,275 2,033 3,594 5,262
550 52 109 204 420 629 1,211 1,931 3,413 4,997
600 50 104 195 400 600 1,156 1,842 3,256 4,767
650 47 99 187 384 575 1,107 1,764 3,118 4,565
700 46 95 179 368 552 1,063 1,695 2,996 4,386
750 44 92 173 355 532 1,024 1,632 2,886 4,225
800 42 89 167 343 514 989 1,576 2,787 4,080
850 41 86 162 332 497 957 1,526 2,697 3,949
900 40 83 157 322 482 928 1,479 2,615 3,828
950 39 81 152 312 468 901 1,436 2,539 3,718
1,000 38 79 148 304 455 877 1,397 2,470 3,616
1,100 36 75 141 289 432 833 1,327 2,346 3,435
1,200 34 71 134 275 412 794 1,266 2,238 3,277
1,300 33 68 128 264 395 761 1,212 2,143 3,138
1,400 31 65 123 253 379 731 1,165 2,059 3,014
1,500 30 63 119 244 366 704 1,122 1,983 2,904
1,600 29 61 115 236 353 680 1,083 1,915 2,804
1,700 28 59 111 228 342 658 1,048 1,854 2,714
1,800 27 57 108 221 331 638 1,017 1,797 2,631
1,900 27 56 105 215 322 619 987 1,745 2,555
2,000 26 54 102 209 313 602 960 1,698 2,485
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits. 33
TABLE 402.4(4)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 6.0 in. w.c.
Specific Gravity 0.60
INTENDED USE: Initial supply pressure of 11.0 inches w.c. or greater
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 660 1,380 2,600 5,338 7,999 15,405 24,553 43,405 63,551
20 454 949 1,787 3,669 5,497 10,588 16,875 29,832 43,678
30 364 762 1,435 2,946 4,415 8,502 13,551 23,956 35,075
40 312 652 1,228 2,522 3,778 7,277 11,598 20,503 30,020
50 276 578 1,089 2,235 3,349 6,449 10,279 18,172 26,606
60 250 524 986 2,025 3,034 5,844 9,314 16,465 24,107
70 230 482 907 1,863 2,791 5,376 8,568 15,147 22,178
80 214 448 844 1,733 2,597 5,001 7,971 14,092 20,632
90 201 420 792 1,626 2,437 4,693 7,479 13,222 19,359
100 190 397 748 1,536 2,302 4,433 7,065 12,489 18,286
125 168 352 663 1,361 2,040 3,928 6,261 11,069 16,207
150 153 319 601 1,234 1,848 3,559 5,673 10,029 14,684
175 140 293 553 1,135 1,700 3,275 5,219 9,227 13,509
200 131 273 514 1,056 1,582 3,046 4,856 8,584 12,568
250 116 242 456 936 1,402 2,700 4,303 7,608 11,139
300 105 219 413 848 1,270 2,446 3,899 6,893 10,093
350 96 202 380 780 1,169 2,251 3,587 6,342 9,285
400 90 188 353 726 1,087 2,094 3,337 5,900 8,638
450 84 176 332 681 1,020 1,965 3,131 5,535 8,105
500 80 166 313 643 964 1,856 2,958 5,229 7,656
550 76 158 297 611 915 1,762 2,809 4,966 7,271
600 72 151 284 583 873 1,681 2,680 4,738 6,937
650 69 144 272 558 836 1,610 2,566 4,537 6,643
700 66 139 261 536 803 1,547 2,465 4,359 6,382
750 64 134 252 516 774 1,490 2,375 4,199 6,148
800 62 129 243 499 747 1,439 2,294 4,055 5,937
850 60 125 235 483 723 1,393 2,220 3,924 5,745
900 58 121 228 468 701 1,350 2,152 3,804 5,570
950 56 118 221 454 681 1,311 2,090 3,695 5,410
1,000 55 114 215 442 662 1,275 2,033 3,594 5,262
1,100 52 109 204 420 629 1,211 1,931 3,413 4,997
1,200 50 104 195 400 600 1,156 1,842 3,256 4,767
1,300 47 99 187 384 575 1,107 1,764 3,118 4,565
1,400 46 95 179 368 552 1,063 1,695 2,996 4,386
1,500 44 92 173 355 532 1,024 1,632 2,886 4,225
1,600 42 89 167 343 514 989 1,576 2,787 4,080
1,700 41 86 162 332 497 957 1,526 2,697 3,949
1,800 40 83 157 322 482 928 1,479 2,615 3,828
1,900 39 81 152 312 468 901 1,436 2,539 3,718
2,000 38 79 148 304 455 877 1,397 2,470 3,616
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits. 34
TABLE 402.4(5)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 1,510 3,040 5,560 11,400 17,100 32,900 52,500 92,800 189,000
20 1,070 2,150 3,930 8,070 12,100 23,300 37,100 65,600 134,000
30 869 1,760 3,210 6,590 9,880 19,000 30,300 53,600 109,000
40 753 1,520 2,780 5,710 8,550 16,500 26,300 46,400 94,700
50 673 1,360 2,490 5,110 7,650 14,700 23,500 41,500 84,700
60 615 1,240 2,270 4,660 6,980 13,500 21,400 37,900 77,300
70 569 1,150 2,100 4,320 6,470 12,500 19,900 35,100 71,600
80 532 1,080 1,970 4,040 6,050 11,700 18,600 32,800 67,000
90 502 1,010 1,850 3,810 5,700 11,000 17,500 30,900 63,100
100 462 934 1,710 3,510 5,260 10,100 16,100 28,500 58,200
125 414 836 1,530 3,140 4,700 9,060 14,400 25,500 52,100
150 372 751 1,370 2,820 4,220 8,130 13,000 22,900 46,700
175 344 695 1,270 2,601 3,910 7,530 12,000 21,200 43,300
200 318 642 1,170 2,410 3,610 6,960 11,100 19,600 40,000
250 279 583 1,040 2,140 3,210 6,180 9,850 17,400 35,500
300 253 528 945 1,940 2,910 5,600 8,920 15,800 32,200
350 232 486 869 1,790 2,670 5,150 8,210 14,500 29,600
400 216 452 809 1,660 2,490 4,790 7,640 13,500 27,500
450 203 424 759 1,560 2,330 4,500 7,170 12,700 25,800
500 192 401 717 1,470 2,210 4,250 6,770 12,000 24,400
550 182 381 681 1,400 2,090 4,030 6,430 11,400 23,200
600 174 363 650 1,330 2,000 3,850 6,130 10,800 22,100
650 166 348 622 1,280 1,910 3,680 5,870 10,400 21,200
700 160 334 598 1,230 1,840 3,540 5,640 9,970 20,300
750 154 322 576 1,180 1,770 3,410 5,440 9,610 19,600
800 149 311 556 1,140 1,710 3,290 5,250 9,280 18,900
850 144 301 538 1,100 1,650 3,190 5,080 8,980 18,300
900 139 292 522 1,070 1,600 3,090 4,930 8,710 17,800
950 135 283 507 1,040 1,560 3,000 4,780 8,460 17,200
1,000 132 275 493 1,010 1,520 2,920 4,650 8,220 16,800
1,100 125 262 468 960 1,440 2,770 4,420 7,810 15,900
1,200 119 250 446 917 1,370 2,640 4,220 7,450 15,200
1,300 114 239 427 878 1,320 2,530 4,040 7,140 14,600
1,400 110 230 411 843 1,260 2,430 3,880 6,860 14,000
1,500 106 221 396 812 1,220 2,340 3,740 6,600 13,500
1,600 102 214 382 784 1,180 2,260 3,610 6,380 13,000
1,700 99 207 370 759 1,140 2,190 3,490 6,170 12,600
1,800 96 200 358 736 1,100 2,120 3,390 5,980 12,200
1,900 93 195 348 715 1,070 2,060 3,290 5,810 11,900
2,000 91 189 339 695 1,040 2,010 3,200 5,650 11,500
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits. 35

 

TABLE 402.4(6)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 3.0 psi
Pressure Drop 2.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal ½ ¼ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 2,350 4,920 9,270 19,000 28,500 54,900 87,500 155,000 316,000
20 1,620 3,380 6,370 13,100 19,600 37,700 60,100 106,000 217,000
30 1,300 2,720 5,110 10,500 15,700 30,300 48,300 85,400 174,000
40 1,110 2,320 4,380 8,990 13,500 25,900 41,300 73,100 149,000
50 985 2,060 3,880 7,970 11,900 23,000 36,600 64,800 132,000
60 892 1,870 3,520 7,220 10,800 20,800 33,200 58,700 120,000
70 821 1,720 3,230 6,640 9,950 19,200 30,500 54,000 110,000
80 764 1,600 3,010 6,180 9,260 17,800 28,400 50,200 102,000
90 717 1,500 2,820 5,800 8,680 16,700 26,700 47,100 96,100
100 677 1,420 2,670 5,470 8,200 15,800 25,200 44,500 90,800
125 600 1,250 2,360 4,850 7,270 14,000 22,300 39,500 80,500
150 544 1,140 2,140 4,400 6,590 12,700 20,200 35,700 72,900
175 500 1,050 1,970 4,040 6,060 11,700 18,600 32,900 67,100
200 465 973 1,830 3,760 5,640 10,900 17,300 30,600 62,400
250 412 862 1,620 3,330 5,000 9,620 15,300 27,100 55,300
300 374 781 1,470 3,020 4,530 8,720 13,900 24,600 50,100
350 344 719 1,350 2,780 4,170 8,020 J 2,800 22,600 46,100
400 320 669 1,260 2,590 3,870 7,460 11,900 21,000 42,900
450 300 627 1,180 2,430 3,640 7,000 11,200 19,700 40,200
500 283 593 1,120 2,290 3,430 6,610 10,500 18,600 38,000
550 269 563 1,060 2,180 3,260 6,280 10,000 17,700 36,100
600 257 537 1,010 2,080 3,110 5,990 9,550 16,900 34,400
650 246 514 969 1,990 2,980 5,740 9,150 16,200 33,000
700 236 494 931 1,910 2,860 5,510 8,790 15,500 31,700
750 228 476 897 1,840 2,760 5,310 8,470 15,000 30,500
800 220 460 866 1,780 2,660 5,130 8,180 14,500 29,500
850 213 445 838 1,720 2,580 4,960 7,910 14,000 28,500
900 206 431 812 1,670 2,500 4,810 7,670 13,600 27,700
950 200 419 789 1,620 2,430 4,670 7,450 13,200 26,900
1,000 195 407 767 1,580 2,360 4,550 7,240 12,800 26,100
1,100 185 387 729 1,500 2,240 4,320 6,890 12,200 24,800
1,200 177 369 695 1,430 2,140 4,120 6,570 11,600 23,700
1,300 169 353 666 1,370 2,050 3,940 6,290 11,100 22,700
1,400 162 340 640 1,310 1,970 3,790 6,040 10,700 21,800
1,500 156 327 616 1,270 1,900 3,650 5,820 10,300 21,000
1,600 151 316 595 1,220 1,830 3,530 5,620 10,000 20,300
1,700 146 306 576 1,180 1,770 3,410 5,440 9,610 19,600
1,800 142 296 558 1,150 1,720 3,310 5,270 9,320 19,000
1,900 138 288 542 1,110 1,670 3,210 5,120 9,050 18,400
2,000 134 280 527 1,080 1,620 3,120 4,980 8,800 18,000
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits. 36

 

TABLE 402.4(7)
SCHEDULE 40 METALLIC PIPE
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 3,190 6,430 11,800 24,200 36,200 69,700 111,000 196,000 401,000
20 2,250 4,550 8,320 17,100 25,600 49,300 78,600 139,000 283,000
30 1,840 3,720 6,790 14,000 20,900 40,300 64,200 113,000 231,000
40 1,590 3,220 5,880 12,100 18,100 34,900 55,600 98,200 200,000
50 1,430 2,880 5,260 10,800 16,200 31,200 49,700 87,900 179,000
60 1,300 2,630 4,800 9,860 14,800 28,500 45,400 80,200 164,000
70 1,200 2,430 4,450 9,130 13,700 26,400 42,000 74,300 151,000
80 1,150 2,330 4,260 8,540 12,800 24,700 39,300 69,500 142,000
90 1,060 2,150 3,920 8,050 12,100 23,200 37,000 65,500 134,000
100 979 1,980 3,620 7,430 11,100 21,400 34,200 60,400 123,000
125 876 1,770 3,240 6,640 9,950 19,200 30,600 54,000 110,000
150 786 1,590 2,910 5,960 8,940 17,200 27,400 48,500 98,900
175 728 1,470 2,690 5,520 8,270 15,900 25,400 44,900 91,600
200 673 1,360 2,490 5,100 7,650 14,700 23,500 41,500 84,700
250 558 1,170 2,200 4,510 6,760 13,000 20,800 36,700 74,900
300 506 1,060 1,990 4,090 6,130 11,800 18,800 33,300 67,800
350 465 973 1,830 3,760 5,640 10,900 17,300 30,600 62,400
400 433 905 1,710 3,500 5,250 10,100 16,100 28,500 58,100
450 406 849 1,600 3,290 4,920 9,480 15,100 26,700 54,500
500 384 802 1,510 3,100 4,650 8,950 14,300 25,200 51,500
550 364 762 1,440 2,950 4,420 8,500 13,600 24,000 48,900
600 348 727 1,370 2,810 4,210 8,110 12,900 22,900 46,600
650 333 696 1,310 2,690 4,030 7,770 12,400 21,900 44,600
700 320 669 1,260 2,590 3,880 7,460 11,900 21,000 42,900
750 308 644 1,210 2,490 3,730 7,190 11,500 20,300 41,300
800 298 622 1,170 2,410 3,610 6,940 11,100 19,600 39,900
850 288 602 1,130 2,330 3,490 6,720 10,700 18,900 38,600
900 279 584 1,100 2,260 3,380 6,520 10,400 18,400 37,400
950 271 567 1,070 2,190 3,290 6,330 10,100 17,800 36,400
1,000 264 551 1,040 2,130 3,200 6,150 9,810 17,300 35,400
1,100 250 524 987 2,030 3,030 5,840 9,320 16,500 33,600
1,200 239 500 941 1,930 2,900 5,580 8,890 15,700 32,000
1,300 229 478 901 1,850 2,770 5,340 8,510 15,000 30,700
1,400 220 460 866 1,780 2,660 5,130 8,180 14,500 29,500
1,500 212 443 834 1,710 2,570 4,940 7,880 13,900 28,400
1,600 205 428 806 1,650 2,480 4,770 7,610 13,400 27,400
1,700 198 414 780 1,600 2,400 4,620 7,360 13,000 26,500
1,800 192 401 756 1,550 2,330 4,480 7,140 12,600 25,700
1,900 186 390 734 1,510 2,260 4,350 6,930 12,300 25,000
2,000 181 379 714 1,470 2,200 4,230 6,740 11,900 24,300
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
37
TABLE 402.4(8)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. W.C.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 20 42 85 148 210 448 806 1,270 2,650
20 14 29 58 102 144 308 554 873 1,820
30 11 23 47 82 116 247 445 701 1,460
40 10 20 40 70 99 211 381 600 1,250
50 NA 17 35 62 88 187 337 532 1,110
60 NA 16 32 56 79 170 306 482 1,000
70 NA 14 29 52 73 156 281 443 924
80 NA 13 27 48 68 145 262 413 859
90 NA 13 26 45 64 136 245 387 806
100 NA 12 24 43 60 129 232 366 761
125 NA 11 22 38 53 114 206 324 675
150 NA 10 20 34 48 103 186 294 612
175 NA NA 18 31 45 95 171 270 563
200 NA NA 17 29 41 89 159 251 523
250 NA NA 15 26 37 78 141 223 464
300 NA NA 13 23 33 71 128 202 420
350 NA NA 12 22 31 65 118 186 387
400 NA NA 11 20 28 61 110 173 360
450 NA NA 11 19 27 57 103 162 338
500 NA NA 10 18 25 54 97 153 319
550 NA NA NA 17 24 51 92 145 303
600 NA NA NA 16 23 49 88 139 289
650 NA NA NA 15 22 47 84 133 277
700 NA NA NA 15 21 45 81 128 266
750 NA NA NA 14 20 43 78 123 256
800 NA NA NA 14 20 42 75 119 247
850 NA NA NA 13 19 40 73 115 239
900 NA NA NA 13 18 39 71 111 232
950 NA NA NA 13 18 38 69 108 225
1,000 NA NA NA 12 17 37 67 105 219
1,100 NA NA NA 12 16 35 63 100 208
1,200 NA NA NA 11 16 34 60 95 199
1,300 NA NA NA 11 15 32 58 91 190
1,400 NA NA NA 10 14 31 56 88 183
1,500 NA NA NA NA 14 30 54 84 176
1,600 NA NA NA NA 13 29 52 82 170
1,700 NA NA NA NA 13 28 50 79 164
1,800 NA NA NA NA 13 27 49 77 159
1,900 NA NA NA NA 12 26 47 74 155
2,000 NA NA NA NA 12 25 46 72 151
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
38
TABLE 402.4(9)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. W.C.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 27 55 111 195 276 590 1,060 1,680 3,490
20 18 38 77 134 190 406 730 1,150 2,400
30 15 30 61 107 152 326 586 925 1,930
40 13 26 53 92 131 279 502 791 1,650
50 11 23 47 82 116 247 445 701 1,460
60 10 21 42 74 105 224 403 635 1,320
70 NA 19 39 68 96 206 371 585 1,220
80 NA 18 36 63 90 192 345 544 1,130
90 NA 17 34 59 84 180 324 510 1,060
100 NA 16 32 56 79 170 306 482 1,000
125 NA 14 28 50 70 151 271 427 890
150 NA 13 26 45 64 136 245 387 806
175 NA 12 24 41 59 125 226 356 742
200 NA 11 22 39 55 117 210 331 690
250 NA NA 20 34 48 103 186 294 612
300 NA NA 18 31 44 94 169 266 554
350 NA NA 16 28 40 86 155 245 510
400 NA NA 15 26 38 80 144 228 474
450 NA NA 14 25 35 75 135 214 445
500 NA NA 13 23 33 71 128 202 420
550 NA NA 13 22 32 68 122 192 399
600 NA NA 12 21 30 64 116 183 381
650 NA NA 12 20 29 62 111 175 365
700 NA NA 11 20 28 59 107 168 350
750 NA NA 11 19 27 57 103 162 338
800 NA NA 10 18 26 55 99 156 326
850 NA NA 10 18 25 53 96 151 315
900 NA NA NA 17 24 52 93 147 306
950 NA NA NA 17 24 50 90 143 297
1,000 NA NA NA 16 23 49 88 139 289
1,100 NA NA NA 15 22 46 84 132 274
1,200 NA NA NA 15 21 44 80 126 262
1,300 NA NA NA 14 20 42 76 120 251
1,400 NA NA NA 13 19 41 73 116 241
1,500 NA NA NA 13 18 39 71 111 232
1,600 NA NA NA 13 18 38 68 108 224
1,700 NA NA NA 12 17 37 66 104 217
1,800 NA NA NA 12 17 36 64 101 210
1,900 NA NA NA 11 16 35 62 98 204
2,000 NA NA NA 11 16 34 60 95 199
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
39
TABLE 402.4(10)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 1.0 in. W.C.
Specific Gravity 0.60
INTENDED USE: SIZING BETWEEN HOUSE LINE REGULATOR AND THE APPLIANCE
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 39 80 162 283 402 859 1,550 2,440 5,080
20 27 55 111 195 276 590 1,060 1,680 3,490
30 21 44 89 156 222 474 853 1,350 2,800
40 18 38 77 134 190 406 730 1,150 2,400
50 16 33 68 119 168 359 647 1,020 2,130
60 15 30 61 107 152 326 586 925 1,930
70 13 28 57 99 140 300 539 851 1,770
80 13 26 53 92 131 279 502 791 1,650
90 12 24 49 86 122 262 471 742 1,550
100 11 23 47 82 116 247 445 701 1,460
125 NA 20 41 72 103 219 394 622 1,290
150 NA 18 37 65 93 198 357 563 1,170
175 NA 17 34 60 85 183 329 518 1,080
200 NA 16 32 56 79 170 306 482 1,000
250 NA 14 28 50 70 151 271 427 890
300 NA 13 26 45 64 136 245 387 806
350 NA 12 24 41 59 125 226 356 742
400 NA 11 22 39 55 117 210 331 690
450 NA 10 21 36 51 110 197 311 647
500 NA NA 20 34 48 103 186 294 612
550 NA NA 19 32 46 98 177 279 581
600 NA NA 18 31 44 94 169 266 554
650 NA NA 17 30 42 90 162 255 531
700 NA NA 16 28 40 86 155 245 510
750 NA NA 16 27 39 83 150 236 491
800 NA NA 15 26 38 80 144 228 474
850 NA NA 15 26 36 78 140 220 459
900 NA NA 14 25 35 75 135 214 445
950 NA NA 14 24 34 73 132 207 432
1,000 NA NA 13 23 33 71 128 202 420
1,100 NA NA 13 22 32 68 122 192 399
1,200 NA NA 12 21 30 64 116 183 381
1,300 NA NA 12 20 29 62 111 175 365
1,400 NA NA 11 20 28 59 107 168 350
1,500 NA NA 11 19 27 57 103 162 338
1,600 NA NA 10 18 26 55 99 156 326
1,700 NA NA 10 18 25 53 96 151 315
1,800 NA NA NA 17 24 52 93 147 306
1,900 NA NA NA 17 24 50 90 143 297
2,000 NA NA NA 16 23 49 88 139 289
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.
40
TABLE 402.4(11)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 17.0 in. W.C.
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 190 391 796 1,390 1,970 4,220 7,590 12,000 24,900
20 130 269 547 956 1,360 2,900 5,220 8,230 17,100
30 105 216 439 768 1,090 2,330 4,190 6,610 13,800
40 90 185 376 657 932 1,990 3,590 5,650 11,800
50 79 164 333 582 826 1,770 3,180 5,010 10,400
60 72 148 302 528 749 1,600 2,880 4,540 9,460
70 66 137 278 486 689 1,470 2,650 4,180 8,700
80 62 127 258 452 641 1,370 2,460 3,890 8,090
90 58 119 243 424 601 1,280 2,310 3,650 7,590
100 55 113 229 400 568 1,210 2,180 3,440 7,170
125 48 100 203 355 503 1,080 1,940 3,050 6,360
150 44 90 184 321 456 974 1,750 2,770 5,760
175 40 83 169 296 420 896 1,610 2,540 5,300
200 38 77 157 275 390 834 1,500 2,370 4,930
250 33 69 140 244 346 739 1,330 2,100 4,370
300 30 62 126 221 313 670 1,210 1,900 3,960
350 28 57 116 203 288 616 1,110 1,750 3,640
400 26 53 108 189 268 573 1,030 1,630 3,390
450 24 50 102 177 252 538 968 1,530 3,180
500 23 47 96 168 238 508 914 1,440 3,000
550 22 45 91 159 226 482 868 1,370 2,850
600 21 43 87 152 215 460 829 1,310 2,720
650 20 41 83 145 206 441 793 1,250 2,610
700 19 39 80 140 198 423 762 1,200 2,500
750 18 38 77 135 191 408 734 1,160 2,410
800 18 37 74 130 184 394 709 1,120 2,330
850 17 35 72 126 178 381 686 1,080 2,250
900 17 34 70 122 173 370 665 1,050 2,180
950 16 33 68 118 168 359 646 1,020 2,120
1,000 16 32 66 115 163 349 628 991 2,060
1,100 15 31 63 109 155 332 597 941 1,960
1,200 14 29 60 104 148 316 569 898 1,870
1,300 14 28 57 100 142 303 545 860 1,790
1,400 13 27 55 96 136 291 524 826 1,720
1,500 13 26 53 93 131 280 505 796 1,660
1,600 12 25 51 89 127 271 487 768 1,600
1,700 12 24 49 86 123 262 472 744 1,550
1,800 11 24 48 84 119 254 457 721 1,500
1,900 11 23 47 81 115 247 444 700 1,460
2,000 11 22 45 79 112 240 432 681 1,420
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
41
TABLE 402.4(12)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 245 506 1,030 1,800 2,550 5,450 9,820 15,500 32,200
20 169 348 708 1,240 1,760 3,750 6,750 10,600 22,200
30 135 279 568 993 1,410 3,010 5,420 8,550 17,800
40 116 239 486 850 1,210 2,580 4,640 7,310 15,200
50 103 212 431 754 1,070 2,280 4,110 6,480 13,500
60 93 192 391 683 969 2,070 3,730 5,870 12,200
70 86 177 359 628 891 1,900 3,430 5,400 11,300
80 80 164 334 584 829 1,770 3,190 5,030 10,500
90 75 154 314 548 778 1,660 2,990 4,720 9,820
100 71 146 296 518 735 1,570 2,830 4,450 9,280
125 63 129 263 459 651 1,390 2,500 3,950 8,220
150 57 117 238 416 590 1,260 2,270 3,580 7,450
175 52 108 219 383 543 1,160 2,090 3,290 6,850
200 49 100 204 356 505 1,080 1,940 3,060 6,380
250 43 89 181 315 448 956 1,720 2,710 5,650
300 39 80 164 286 406 866 1,560 2,460 5,120
350 36 74 150 263 373 797 1,430 2,260 4,710
400 33 69 140 245 347 741 1,330 2,100 4,380
450 31 65 131 230 326 696 1,250 1,970 4,110
500 30 61 124 217 308 657 1,180 1,870 3,880
550 28 58 118 206 292 624 1,120 1,770 3,690
600 27 55 112 196 279 595 1,070 1,690 3,520
650 26 53 108 188 267 570 1,030 1,620 3,370
700 25 51 103 181 256 548 986 1,550 3,240
750 24 49 100 174 247 528 950 1,500 3,120
800 23 47 96 168 239 510 917 1,450 3,010
850 22 46 93 163 231 493 888 1,400 2,920
900 22 44 90 158 224 478 861 1,360 2,830
950 21 43 88 153 217 464 836 1,320 2,740
1,000 20 42 85 149 211 452 813 1,280 2,670
1,100 19 40 81 142 201 429 772 1,220 2,540
1,200 18 38 77 135 192 409 737 1,160 2,420
1,300 18 36 74 129 183 392 705 1,110 2,320
1,400 17 35 71 124 176 376 678 1,070 2,230
1,500 16 34 68 120 170 363 653 1,030 2,140
1,600 16 33 66 116 164 350 630 994 2,070
1,700 15 31 64 112 159 339 610 962 2,000
1,800 15 30 62 108 154 329 592 933 1,940
1,900 14 30 60 105 149 319 575 906 1,890
2,000 14 29 59 102 145 310 559 881 1,830
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
42
TABLE 402.4(13)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.5 psi
Specific Gravity 0.60
INTENDED USE Pipe sizing between point of delivery and the house line regulator.
Total load supplied by a single house line regulator not exceeding 150 cubic feet per hour.
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 303 625 1,270 2,220 3,150 6,740 12,100 19,100 39,800
20 208 430 874 1,530 2,170 4,630 8,330 13,100 27,400
30 167 345 702 1,230 1,740 3,720 6,690 10,600 22,000
40 143 295 601 1,050 1,490 3,180 5,730 9,030 18,800
50 127 262 532 931 1,320 2,820 5,080 8,000 16,700
60 115 237 482 843 1,200 2,560 4,600 7,250 15,100
70 106 218 444 776 1,100 2,350 4,230 6,670 13,900
80 98 203 413 722 1,020 2,190 3,940 6,210 12,900
90 92 190 387 677 961 2,050 3,690 5,820 12,100
100 87 180 366 640 907 1,940 3,490 5,500 11,500
125 77 159 324 567 804 1,720 3,090 4,880 10,200
150 70 144 294 514 729 1,560 2,800 4,420 9,200
175 64 133 270 472 670 1,430 2,580 4,060 8,460
200 60 124 252 440 624 1,330 2,400 3,780 7,870
250 53 110 223 390 553 1,180 2,130 3,350 6,980
300 48 99 202 353 501 1,070 1,930 3,040 6,320
350 44 91 186 325 461 984 1,770 2,790 5,820
400 41 85 173 302 429 916 1,650 2,600 5,410
450 39 80 162 283 402 859 1,550 2,440 5,080
500 36 75 153 268 380 811 1,460 2,300 4,800
550 35 72 146 254 361 771 1,390 2,190 4,560
600 33 68 139 243 344 735 1,320 2,090 4,350
650 32 65 133 232 330 704 1,270 2,000 4,160
700 30 63 128 223 317 676 1,220 1,920 4,000
750 29 60 123 215 305 652 1,170 1,850 3,850
800 28 58 119 208 295 629 1,130 1,790 3,720
850 27 57 115 201 285 609 1,100 1,730 3,600
900 27 55 111 195 276 590 1,060 1,680 3,490
950 26 53 108 189 268 573 1,030 1,630 3,390
1,000 25 52 105 184 261 558 1,000 1,580 3,300
1,100 24 49 100 175 248 530 954 1,500 3,130
1,200 23 47 95 167 237 505 910 1,430 2,990
1,300 22 45 91 160 227 484 871 1,370 2,860
1,400 21 43 88 153 218 465 837 1,320 2,750
1,500 20 42 85 148 210 448 806 1,270 2,650
1,600 19 40 82 143 202 432 779 1,230 2,560
1,700 19 39 79 138 196 419 753 1,190 2,470
1,800 18 38 77 134 190 406 731 1,150 2,400
1,900 18 37 74 130 184 394 709 1,120 2,330
2,000 17 36 72 126 179 383 690 1,090 2,270
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. Where this table is used to size the tubing upstream of a line pressure regulator, the pipe or tubing downstream of the line pressure regulator shall be sized using a pressure drop not greater than 1 inch w.c.
  3. All table entries have been rounded to three significant digits.
43
TABLE 402.4(14)
SEMIRIGID COPPER TUBING
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 511 1,050 2,140 3,750 5,320 11,400 20,400 32,200 67,100
20 351 724 1,470 2,580 3,650 7,800 14,000 22,200 46,100
30 282 582 1,180 2,070 2,930 6,270 11,300 17,800 37,000
40 241 498 1,010 1,770 2,510 5,360 9,660 15,200 31,700
50 214 441 898 1,570 2,230 4,750 8,560 13,500 28,100
60 194 400 813 1,420 2,020 4,310 7,750 12,200 25,500
70 178 368 748 1,310 1,860 3,960 7,130 11,200 23,400
80 166 342 696 1,220 1,730 3,690 6,640 10,500 21,800
90 156 321 653 1,140 1,620 3,460 6,230 9,820 20,400
100 147 303 617 1,080 1,530 3,270 5,880 9,270 19,300
125 130 269 547 955 1,360 2,900 5,210 8,220 17,100
150 118 243 495 866 1,230 2,620 4,720 7,450 15,500
175 109 224 456 796 1,130 2,410 4,350 6,850 14,300
200 101 208 424 741 1,050 2,250 4,040 6,370 13,300
250 90 185 376 657 932 1,990 3,580 5,650 11,800
300 81 167 340 595 844 1,800 3,250 5,120 10,700
350 75 154 313 547 777 1,660 2,990 4,710 9,810
400 69 143 291 509 722 1,540 2,780 4,380 9,120
450 65 134 273 478 678 1,450 2,610 4,110 8,560
500 62 127 258 451 640 1,370 2,460 3,880 8,090
550 58 121 245 429 608 1,300 2,340 3,690 7,680
600 56 115 234 409 580 1,240 2,230 3,520 7,330
650 53 110 224 392 556 1,190 2,140 3,370 7,020
700 51 106 215 376 534 1,140 2,050 3,240 6,740
750 49 102 207 362 514 1,100 1,980 3,120 6,490
800 48 98 200 350 497 1,060 1,910 3,010 6,270
850 46 95 194 339 481 1,030 1,850 2,910 6,070
900 45 92 188 328 466 1,000 1,790 2,820 5,880
950 43 90 182 319 452 967 1,740 2,740 5,710
1,000 42 87 177 310 440 940 J ,690 2,670 5,560
1,100 40 83 169 295 418 893 1,610 2,530 5,280
1,200 38 79 161 281 399 852 1,530 2,420 5,040
1,300 37 76 154 269 382 816 1,470 2,320 4,820
1,400 35 73 148 259 367 784 1,410 2,220 4,630
1,500 34 70 143 249 353 755 1,360 2,140 4,460
1,600 33 68 138 241 341 729 1,310 2,070 4,310
1,700 32 65 133 233 330 705 1,270 2,000 4,170
1,800 31 63 129 226 320 684 1,230 1,940 4,040
1,900 30 62 125 219 311 664 1,200 1,890 3,930
2,000 29 60 122 213 302 646 1,160 1,830 3,820
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
44
TABLE 402.4(15)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. W.C.
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 46 63 115 134 225 270 471 546 895 1,037 1,790 2,070 3,660 4,140
10 32 44 82 95 161 192 330 383 639 746 1,260 1,470 2,600 2,930
15 25 35 66 77 132 157 267 310 524 615 1,030 1,200 2,140 2,400
20 22 31 58 67 116 137 231 269 456 536 888 1,050 1,850 2,080
25 19 27 52 60 104 122 206 240 409 482 793 936 1,660 1,860
30 18 25 47 55 96 112 188 218 374 442 723 856 1,520 1,700
40 15 21 41 47 83 97 162 188 325 386 625 742 1,320 1,470
50 13 19 37 42 75 87 144 168 292 347 559 665 1,180 1,320
60 12 17 34 38 68 80 131 153 267 318 509 608 1,080 1,200
70 11 16 31 36 63 74 121 141 248 295 471 563 1,000 1,110
80 10 15 29 33 60 69 113 132 232 277 440 527 940 1,040
90 10 14 28 32 57 65 107 125 219 262 415 498 887 983
100 9 13 26 30 54 62 101 118 208 249 393 472 843 933
150 7 10 20 23 42 48 78 91 171 205 320 387 691 762
200 6 9 18 21 38 44 71 82 148 179 277 336 600 661
250 5 8 16 19 34 39 63 74 133 161 247 301 538 591
300 5 7 15 17 32 36 57 67 95 148 226 275 492 540
For SI: 1 inch = 25.4 mm. 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
45
TABLE 402.4(16)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 3.0 in. W.C.
Specific Gravity 0.60
INTENDED USE: Inital supply pressure of 8.0 inches w.c. or greater
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 120 160 277 327 529 649 1,180 1,370 2,140 4,430 5,010 8,800 10,100
10 83 112 197 231 380 462 828 958 1,530 3,200 3,560 6,270 7,160
15 67 90 161 189 313 379 673 778 1,250 2,540 2,910 5,140 5,850
20 57 78 140 164 273 329 580 672 1,090 2,200 2,530 4,460 5,070
25 51 69 125 147 245 295 518 599 978 1,960 2,270 4,000 4,540
30 46 63 115 134 225 270 471 546 895 1,790 2,070 3,660 4,140
40 39 54 100 116 196 234 407 471 778 1,550 1,800 3,180 3,590
50 35 48 89 104 176 210 363 421 698 1,380 1,610 2,850 3,210
60 32 44 82 95 161 192 330 383 639 1,260 1,470 2,600 2,930
70 29 41 76 88 150 178 306 355 593 1,170 1,360 2,420 2,720
80 27 38 71 82 141 167 285 331 555 1,090 1,280 2,260 2,540
90 26 36 67 77 133 157 268 311 524 1,030 1,200 2,140 2,400
100 24 34 63 73 126 149 254 295 498 974 1,140 2,030 2,280
150 19 27 52 60 104 122 206 240 409 793 936 1,660 1,860
200 17 23 45 52 91 106 178 207 355 686 812 1,440 1,610
250 15 21 40 46 82 95 159 184 319 613 728 1,290 1,440
300 13 19 37 42 75 87 144 168 234 559 665 1,180 1,320
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
46
TABLE 402.4(17)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 6.0 in. W.C.
Specific Gravity 0.60
INTENDED USE: Inital supply pressure of 11.0 inches w.c. or greater
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
5 173 229 389 461 737 911 1,690 1,950 3,000 6,280 7,050 12,400 14,260
10 120 160 277 327 529 649 1,180 1,370 2,140 4,430 5,010 8,800 10,100
15 96 130 227 267 436 532 960 1,110 1,760 3,610 4,100 7,210 8,260
20 83 112 197 231 380 462 828 958 1,530 3,120 3,560 6,270 7,160
25 74 99 176 207 342 414 739 855 1,370 2,790 3,190 5,620 6,400
30 67 90 161 189 313 379 673 778 1,250 2,540 2,910 5,140 5,850
40 57 78 140 164 273 329 580 672 1,090 2,200 2,530 4,460 5,070
50 51 69 125 147 245 295 518 599 978 1,960 2,270 4,000 4,540
60 46 63 115 134 225 270 471 546 895 1,790 2,070 3,660 4,140
70 42 58 106 124 209 250 435 505 830 1,660 1,920 3,390 3,840
80 39 54 100 116 196 234 407 471 778 1,550 1,800 3,180 3,590
90 37 51 94 109 185 221 383 444 735 1,460 1,700 3,000 3,390
100 35 48 89 104 176 210 363 421 698 1,380 1,610 2,850 3,210
150 28 39 73 85 145 172 294 342 573 1,130 1,320 2,340 2,630
200 24 34 63 73 126 149 254 295 498 974 1,140 2,030 2,280
250 21 30 57 66 114 134 226 263 447 870 1,020 1,820 2,040
300 19 27 52 60 104 122 206 240 409 793 936 1,660 1,860
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
47
TABLE 402.4(18)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure 2 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 270 353 587 700 1,100 1,370 2,590 2,990 4,510 5,037 9,600 10,700 18,600 21,600
25 166 220 374 444 709 876 1,620 1,870 2,890 3,258 6,040 6,780 11,900 13,700
30 151 200 342 405 650 801 1,480 1,700 2,640 2,987 5,510 6,200 10,900 12,500
40 129 172 297 351 567 696 1,270 1,470 2,300 2,605 4,760 5,380 9,440 10,900
50 115 154 266 314 510 624 1,140 1,310 2,060 2,343 4,260 4,820 8,470 9,720
75 93 124 218 257 420 512 922 1,070 1,690 1,932 3,470 3,950 6,940 7,940
80 89 120 211 249 407 496 892 1,030 1,640 1,874 3,360 3,820 6,730 7,690
100 79 107 189 222 366 445 795 920 1,470 1,685 3,000 3,420 6,030 6,880
150 64 87 155 182 302 364 646 748 1,210 1,389 2,440 2,800 4,940 5,620
200 55 75 135 157 263 317 557 645 1,050 1,212 2,110 2,430 4,290 4,870
250 49 67 121 141 236 284 497 576 941 1,090 1,890 2,180 3,850 4,360
300 44 61 110 129 217 260 453 525 862 999 1,720 1,990 3,520 3,980
400 38 52 96 111 189 225 390 453 749 871 1,490 1,730 3,060 3,450
500 34 46 86 100 170 202 348 404 552 783 1,330 1,550 2,740 3,090
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds ¾, psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
48
TABLE 402.4(19)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Natural
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 0.60
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 523 674 1,080 1,300 2,000 2,530 4,920 5,660 8,300 9,140 18,100 19,800 34,400 40,400
25 322 420 691 827 1,290 1,620 3,080 3,540 5,310 5,911 11,400 12,600 22,000 25,600
30 292 382 632 755 1,180 1,480 2,800 3,230 4,860 5,420 10,400 11,500 20,100 23,400
40 251 329 549 654 1,030 1,280 2,420 2,790 4,230 4,727 8,970 10,000 17,400 20,200
50 223 293 492 586 926 1,150 2,160 2,490 3,790 4,251 8,020 8,930 15,600 18,100
75 180 238 403 479 763 944 1,750 2,020 3,110 3,506 6,530 7,320 12,800 14,800
80 174 230 391 463 740 915 1,690 1,960 3,020 3,400 6,320 7,090 12,400 14,300
100 154 205 350 415 665 820 1,510 1,740 2,710 3,057 5,650 6,350 11,100 12,800
150 124 166 287 339 548 672 1,230 1,420 2,220 2,521 4,600 5,200 9,130 10,500
200 107 143 249 294 478 584 1,060 1,220 1,930 2,199 3,980 4,510 7,930 9,090
250 95 128 223 263 430 524 945 1,090 1,730 1,977 3,550 4,040 7,110 8,140
300 86 116 204 240 394 479 860 995 1,590 1,813 3,240 3,690 6,500 7,430
400 74 100 177 208 343 416 742 858 1,380 1,581 2,800 3,210 5,650 6,440
500 66 89 159 186 309 373 662 766 1,040 1,422 2,500 2,870 5,060 5,760
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
             1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds ¾ psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
49
TABLE 402.4(20)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.3 in. W.C.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD ½ ¾ 1 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 153 305 551 955 1,440 2,590 7,170 13,900
20 105 210 379 656 991 1,780 4,920 9,520
30 84 169 304 527 796 1,430 3,950 7,640
40 72 144 260 451 681 1,220 3,380 6,540
50 64 128 231 400 604 1,080 3,000 5,800
60 58 116 209 362 547 983 2,720 5,250
70 53 107 192 333 503 904 2,500 4,830
80 50 99 179 310 468 841 2,330 4,500
90 46 93 168 291 439 789 2,180 4,220
100 44 88 159 275 415 745 2,060 3,990
125 39 78 141 243 368 661 1,830 3,530
150 35 71 127 221 333 598 1,660 3,200
175 32 65 117 203 306 551 1,520 2,940
200 30 60 109 189 285 512 1,420 2,740
250 27 54 97 167 253 454 1,260 2,430
300 24 48 88 152 229 411 1,140 2,200
350 22 45 81 139 211 378 1,050 2,020
400 21 42 75 130 196 352 974 1,880
450 19 39 70 122 184 330 914 1,770
500 18 37 66 115 174 312 863 1,670
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
50
TABLE 402.4(21)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure Less than 2 psi
Pressure Drop 0.5 in. W.C.
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD ½ ¾ 1 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 201 403 726 1,260 1,900 3,410 9,450 18,260
20 138 277 499 865 1,310 2,350 6,490 12,550
30 111 222 401 695 1,050 1,880 5,210 10,080
40 95 190 343 594 898 1,610 4,460 8,630
50 84 169 304 527 796 1,430 3,950 7,640
60 76 153 276 477 721 1,300 3,580 6,930
70 70 140 254 439 663 1,190 3,300 6,370
80 65 131 236 409 617 1,110 3,070 5,930
90 61 123 221 383 579 1,040 2,880 5,560
100 58 116 209 362 547 983 2,720 5,250
125 51 103 185 321 485 871 2,410 4,660
150 46 93 168 291 439 789 2,180 4,220
175 43 86 154 268 404 726 2,010 3,880
200 40 80 144 249 376 675 1,870 3,610
250 35 71 127 221 333 598 1,660 3,200
300 32 64 115 200 302 542 1,500 2,900
350 29 59 106 184 278 499 1,380 2,670
400 27 55 99 171 258 464 1,280 2,480
450 26 51 93 160 242 435 1,200 2,330
500 24 48 88 152 229 411 1,140 2,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
51
TABLE 402.4(22)
POLYETHYLENE PLASTIC PIPE
  Gas Natural
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 0.60
PIPE SIZE (inch)
Nominal OD ½ ¾ 1 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR 11 SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Cubic Feet of Gas Per Hour
10 1,860 3,720 6,710 11,600 17,600 31,600 87,300 169,000
20 1,280 2,560 4,610 7,990 12,100 21,700 60,000 116,000
30 1,030 2,050 3,710 6,420 9,690 17,400 48,200 93,200
40 878 1,760 3,170 5,490 8,300 14,900 41,200 79,700
50 778 1,560 2,810 4,870 7,350 13,200 36,600 70,700
60 705 1,410 2,550 4,410 6,660 12,000 33,100 64,000
70 649 1,300 2,340 4,060 6,130 11,000 30,500 58,900
80 603 1,210 2,180 3,780 5,700 10,200 28,300 54,800
90 566 1,130 2,050 3,540 5,350 9,610 26,600 51,400
100 535 1,070 1,930 3,350 5,050 9,080 25,100 48,600
125 474 949 1,710 2,970 4,480 8,050 22,300 43,000
150 429 860 1,550 2,690 4,060 7,290 20,200 39,000
175 395 791 1,430 2,470 3,730 6,710 18,600 35,900
200 368 736 1,330 2,300 3,470 6,240 17,300 33,400
250 326 652 1,180 2,040 3,080 5,530 15,300 29,600
300 295 591 1,070 1,850 2,790 5,010 13,900 26,800
350 272 544 981 1,700 2,570 4,610 12,800 24,700
400 253 506 913 1,580 2,390 4,290 11,900 22,900
450 237 475 856 1,480 2,240 4,020 11,100 21,500
500 224 448 809 1,400 2,120 3,800 10,500 20,300
550 213 426 768 1,330 2,010 3,610 9,990 19,300
600 203 406 733 1,270 1,920 3,440 9,530 18,400
650 194 389 702 1,220 1,840 3,300 9,130 17,600
700 187 374 674 1,170 1,760 3,170 8,770 16,900
750 180 360 649 1,130 1,700 3,050 8,450 16,300
800 174 348 627 1,090 1,640 2,950 8,160 15,800
850 168 336 607 1,050 1,590 2,850 7,890 15,300
900 163 326 588 1,020 1,540 2,770 7,650 14,800
950 158 317 572 990 1,500 2,690 7,430 14,400
1,000 154 308 556 963 1,450 2,610 7,230 14,000
1,100 146 293 528 915 1,380 2,480 6,870 13,300
1,200 139 279 504 873 1,320 2,370 6,550 12,700
1,300 134 267 482 836 1,260 2,270 6,270 12,100
1,400 128 257 463 803 1,210 2,180 6,030 11,600
1,500 124 247 446 773 1,170 2,100 5,810 11,200
1,600 119 239 431 747 1,130 2,030 5,610 10,800
1,700 115 231 417 723 1,090 1,960 5,430 10,500
1,800 112 224 404 701 1,060 1,900 5,260 10,200
1,900 109 218 393 680 1,030 1,850 5,110 9,900
2,000 106 212 382 662 1,000 1,800 4,970 9,600
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
52
TABLE 402.4(23)
POLYETHYLENE PLASTIC TUBING
Gas Natural
Inlet Pressure Less than 2.0 psi
Pressure Drop 0.3 in. W.C.
Specific Gravity 0.60
 
  PLASTIC TUBING SIZE (CTS) (inch)
Nominal OD ½ ¾
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 54 372
20 37 256
30 30 205
40 26 176
50 23 156
60 21 141
70 19 130
80 18 121
90 17 113
100 16 107
125 14 95
150 13 86
175 12 79
200 11 74
225 10 69
250 NA 65
275 NA 62
300 NA 59
350 NA 54
400 NA 51
450 NA 47
500 NA 45
For SI: 1 inch = 25.4 mm. 1 foot = 304.8 mm,
            1 pound per square inch = 6.895 kPa,
            1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W,
            1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. NA means a How of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.

 

TABLE 402.4(24)
POLYETHYLENE PLASTIC TUBING
Gas Natural
Inlet Pressure Less than 2.0 psi
Pressure Drop 0.5 in. W.C.
Specific Gravity 0.60
 
  PLASTIC TUBING SIZE (CTS) (inch)
Nominal OD ½ ¾
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 72 490
20 49 337
30 39 271
40 34 232
50 30 205
60 27 186
70 25 171
80 23 159
90 22 149
100 21 141
125 18 125
150 17 113
175 15 104
200 14 97
225 13 91
250 12 86
275 11 82
300 11 78
350 10 72
400 NA 67
450 NA 63
500 NA 59
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,
            1 pound per square inch = 6.895 kPa,
            1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W,
            1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.
53
TABLE 402.4(25)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 3,320 6,950 13,100 26,900 40,300 77,600 124,000 219,000 446,000
20 2,280 4,780 9,000 18,500 27,700 53,300 85,000 150,000 306,000
30 1,830 3,840 7,220 14,800 22,200 42,800 68,200 121,000 246,000
40 1,570 3,280 6,180 12,700 19,000 36,600 58,400 103,000 211,000
50 1,390 2,910 5,480 11,300 16,900 32,500 51,700 91,500 187,000
60 1,260 2,640 4,970 10,200 15,300 29,400 46,900 82,900 169,000
70 1,160 2,430 4,570 9,380 14,100 27,100 43,100 76,300 156,000
80 1,080 2,260 4,250 8,730 13,100 25,200 40,100 70,900 145,000
90 1,010 2,120 3,990 8,190 12,300 23,600 37,700 66,600 136,000
100 956 2,000 3,770 7,730 11,600 22,300 35,600 62,900 128,000
125 848 1,770 3,340 6,850 10,300 19,800 31,500 55,700 114,000
150 768 1,610 3,020 6,210 9,300 17,900 28,600 50,500 103,000
175 706 1,480 2,780 5,710 8,560 16,500 26,300 46,500 94,700
200 657 1,370 2,590 5,320 7,960 15,300 24,400 43,200 88,100
250 582 1,220 2,290 4,710 7,060 13,600 21,700 38,300 78,100
300 528 1,100 2,080 4,270 6,400 12,300 19,600 34,700 70,800
350 486 1,020 1,910 3,930 5,880 11,300 18,100 31,900 65,100
400 452 945 1,780 3,650 5,470 10,500 16,800 29,700 60,600
450 424 886 1,670 3,430 5,140 9,890 15,800 27,900 56,800
500 400 837 1,580 3,240 4,850 9,340 14,900 26,300 53,700
550 380 795 1,500 3,070 4,610 8,870 14,100 25,000 51,000
600 363 759 1,430 2,930 4,400 8,460 13,500 23,900 48,600
650 347 726 1,370 2,810 4,210 8,110 12,900 22,800 46,600
700 334 698 1,310 2,700 4,040 7,790 12,400 21,900 44,800
750 321 672 1,270 2,600 3,900 7,500 12,000 21,100 43,100
800 310 649 1,220 2,510 3,760 7,240 11,500 20,400 41,600
850 300 628 1,180 2,430 3,640 7,010 11,200 19,800 40,300
900 291 609 1,150 2,360 3,530 6,800 10,800 19,200 39,100
950 283 592 1,110 2,290 3,430 6,600 10,500 18,600 37,900
1,000 275 575 1,080 2,230 3,330 6,420 10,200 18,100 36,900
1,100 261 546 1,030 2,110 3,170 6,100 9,720 17,200 35,000
1,200 249 521 982 2,020 3,020 5,820 9,270 16,400 33,400
1,300 239 499 940 1,930 2,890 5,570 8,880 15,700 32,000
1,400 229 480 903 1,850 2,780 5,350 8,530 15,100 30,800
1,500 221 462 870 1,790 2,680 5,160 8,220 14,500 29,600
1,600 213 446 840 1,730 2,590 4,980 7,940 14,000 28,600
1,700 206 432 813 1,670 2,500 4,820 7,680 13,600 27,700
1,800 200 419 789 1,620 2,430 4,670 7,450 13,200 26,900
1,900 194 407 766 1,570 2,360 4,540 7,230 12,800 26,100
2,000 189 395 745 1,530 2,290 4,410 7,030 12,400 25,400
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
54
TABLE 402.4(26)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 3.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 5,890 12,300 23,200 47,600 71,300 137,000 219,000 387,000 789,000
20 4,050 8,460 15,900 32,700 49,000 94,400 150,000 266,000 543,000
30 3,250 6,790 12,800 26,300 39,400 75,800 121,000 214,000 436,000
40 2,780 5,810 11,000 22,500 33,700 64,900 103,000 183,000 373,000
50 2,460 5,150 9,710 19,900 29,900 57,500 91,600 162,000 330,000
60 2,230 4,670 8,790 18,100 27,100 52,100 83,000 147,000 299,000
70 2,050 4,300 8,090 16,600 24,900 47,900 76,400 135,000 275,000
80 1,910 4,000 7,530 15,500 23,200 44,600 71,100 126,000 256,000
90 1,790 3,750 7,060 14,500 21,700 41,800 66,700 118,000 240,000
100 1,690 3,540 6,670 13,700 20,500 39,500 63,000 111,000 227,000
125 1,500 3,140 5,910 12,100 18,200 35,000 55,800 98,700 201,000
150 1,360 2,840 5,360 11,000 16,500 31,700 50,600 89,400 182,000
175 1,250 2,620 4,930 10,100 15,200 29,200 46,500 82,300 167,800
200 1,160 2,430 4,580 9,410 14,100 27,200 43,300 76,500 156,100
250 1,030 2,160 4,060 8,340 12,500 24,100 38,400 67,800 138,400
300 935 1,950 3,680 7,560 11,300 21,800 34,800 61,500 125,400
350 860 1,800 3,390 6,950 10,400 20,100 32,000 56,500 115,300
400 800 1,670 3,150 6,470 9,690 18,700 29,800 52,600 107,300
450 751 1,570 2,960 6,070 9,090 17,500 27,900 49,400 100,700
500 709 1,480 2,790 5,730 8,590 16,500 26,400 46,600 95,100
550 673 1,410 2,650 5,450 8,160 15,700 25,000 44,300 90,300
600 642 1,340 2,530 5,200 7,780 15,000 23,900 42,200 86,200
650 615 1,290 2,420 4,980 7,450 14,400 22,900 40,500 82,500
700 591 1,240 2,330 4,780 7,160 13,800 22,000 38,900 79,300
750 569 1,190 2,240 4,600 6,900 13,300 21,200 37,400 76,400
800 550 1,150 2,170 4,450 6,660 12,800 20,500 36,200 73,700
850 532 1,110 2,100 4,300 6,450 12,400 19,800 35,000 71,400
900 516 1,080 2,030 4,170 6,250 12,000 19,200 33,900 69,200
950 501 1,050 1,970 4,050 6,070 11,700 18,600 32,900 67,200
1,000 487 1,020 1,920 3,940 5,900 11,400 18,100 32,000 65,400
1,100 463 968 1,820 3,740 5,610 10,800 17,200 30,400 62,100
1,200 442 923 1,740 3,570 5,350 10,300 16,400 29,000 59,200
1,300 423 884 1,670 3,420 5,120 9,870 15,700 27,800 56,700
1,400 406 849 1,600 3,280 4,920 9,480 15,100 26,700 54,500
1,500 391 818 1,540 3,160 4,740 9,130 14,600 25,700 52,500
1,600 378 790 1,490 3,060 4,580 8,820 14,100 24,800 50,700
1,700 366 765 1,440 2,960 4,430 8,530 13,600 24,000 49,000
1,800 355 741 1,400 2,870 4,300 8,270 13,200 23,300 47,600
1,900 344 720 1,360 2,780 4,170 8,040 12,800 22,600 46,200
2,000 335 700 1,320 2,710 4,060 7,820 12,500 22,000 44,900
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
55
TABLE 402.4(27)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Pipe sizing between 2 psig service and line pressure regulator.
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 2,680 5,590 10,500 21,600 32,400 62,400 99,500 176,000 359,000
20 1,840 3,850 7,240 14,900 22,300 42,900 68,400 121,000 247,000
30 1,480 3,090 5,820 11,900 17,900 34,500 54,900 97,100 198,000
40 1,260 2,640 4,980 10,200 15,300 29,500 47,000 83,100 170,000
50 1,120 2,340 4,410 9,060 13,600 26,100 41,700 73,700 150,000
60 1,010 2,120 4,000 8,210 12,300 23,700 37,700 66,700 136,000
70 934 1,950 3,680 7,550 11,300 21,800 34,700 61,400 125,000
80 869 1,820 3,420 7,020 10,500 20,300 32,300 57,100 116,000
90 815 1,700 3,210 6,590 9,880 19,000 30,300 53,600 109,000
100 770 1,610 3,030 6,230 9,330 18,000 28,600 50,600 103,000
125 682 1,430 2,690 5,520 8,270 15,900 25,400 44,900 91,500
150 618 1,290 2,440 5,000 7,490 14,400 23,000 40,700 82,900
175 569 1,190 2,240 4,600 6,890 13,300 21,200 37,400 76,300
200 529 1,110 2,080 4,280 6,410 12,300 19,700 34,800 71,000
250 469 981 1,850 3,790 5,680 10,900 17,400 30,800 62,900
300 425 889 1,670 3,440 5,150 9,920 15,800 27,900 57,000
350 391 817 1,540 3,160 4,740 9,120 14,500 25,700 52,400
400 364 760 1,430 2,940 4,410 8,490 13,500 23,900 48,800
450 341 714 1,340 2,760 4,130 7,960 12,700 22,400 45,800
500 322 674 1,270 2,610 3,910 7,520 12,000 21,200 43,200
550 306 640 1,210 2,480 3,710 7,140 11,400 20,100 41,100
600 292 611 1,150 2,360 3,540 6,820 10,900 19,200 39,200
650 280 585 1,100 2,260 3,390 6,530 10,400 18,400 37,500
700 269 562 1,060 2,170 3,260 6,270 9,990 17,700 36,000
750 259 541 1,020 2,090 3,140 6,040 9,630 17,000 34,700
800 250 523 985 2,020 3,030 5,830 9,300 16,400 33,500
850 242 506 953 1,960 2,930 5,640 9,000 15,900 32,400
900 235 490 924 1,900 2,840 5,470 8,720 15,400 31,500
950 228 476 897 1,840 2,760 5,310 8,470 15,000 30,500
1,000 222 463 873 1,790 2,680 5,170 8,240 14,600 29,700
1,100 210 440 829 1,700 2,550 4,910 7,830 13,800 28,200
1,200 201 420 791 1,620 2,430 4,680 7,470 13,200 26,900
1,300 192 402 757 1,550 2,330 4,490 7,150 12,600 25,800
1,400 185 386 727 1,490 2,240 4,310 6,870 12,100 24,800
1,500 178 372 701 1,440 2,160 4,150 6,620 11,700 23,900
1,600 172 359 677 1,390 2,080 4,010 6,390 11,300 23,000
1,700 166 348 655 1,340 2,010 3,880 6,180 10,900 22,300
1,800 161 337 635 1,300 1,950 3,760 6,000 10,600 21,600
1,900 157 327 617 1,270 1,900 3,650 5,820 10,300 21,000
2,000 152 318 600 1,230 1,840 3,550 5,660 10,000 20,400
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
56
TABLE 402.4(28)
SCHEDULE 40 METALLIC PIPE
  Gas Undiluted Propane
Inlet Pressure 11.0 in. W.C.
Pressure Drop 0.5 in. W.C.
Specific Gravity 1.50
INTENDED USE Pipe sizing between single- or second-stage (low pressure) regulator and appliance.
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Actual ID 0.622 0.824 1.049 1.380 1.610 2.067 2,469 3.068 4.026
Length (ft) Capacity in Thousands of Btu per Hour
10 291 608 1,150 2,350 3,520 6,790 10,800 19,100 39,000
20 200 418 787 1,620 2,420 4,660 7,430 13,100 26,800
30 160 336 632 1,300 1,940 3,750 5,970 10,600 21,500
40 137 287 541 1,110 1,660 3,210 5,110 9,030 18,400
50 122 255 480 985 1,480 2,840 4,530 8,000 16,300
60 110 231 434 892 1,340 2,570 4,100 7,250 14,800
80 101 212 400 821 1,230 2,370 3,770 6,670 13,600
100 94 197 372 763 1,140 2,200 3,510 6,210 12,700
125 89 185 349 716 1,070 2,070 3,290 5,820 11,900
150 84 175 330 677 1,010 1,950 3,110 5,500 11,200
175 74 155 292 600 899 1,730 2,760 4,880 9,950
200 67 140 265 543 814 1,570 2,500 4,420 9,010
250 62 129 243 500 749 1,440 2,300 4,060 8,290
300 58 120 227 465 697 1,340 2,140 3,780 7,710
350 51 107 201 412 618 1,190 1,900 3,350 6,840
400 46 97 182 373 560 1,080 1,720 3,040 6,190
450 42 89 167 344 515 991 1,580 2,790 5,700
500 40 83 156 320 479 922 1,470 2,600 5,300
550 37 78 146 300 449 865 1,380 2,440 4,970
600 35 73 138 283 424 817 1,300 2,300 4,700
650 33 70 131 269 403 776 1,240 2,190 4,460
700 32 66 125 257 385 741 1,180 2,090 4,260
750 30 64 120 246 368 709 1,130 2,000 4,080
800 29 61 115 236 354 681 1,090 1,920 3,920
850 28 59 111 227 341 656 1,050 1,850 3,770
900 27 57 107 220 329 634 1,010 1,790 3,640
950 26 55 104 213 319 613 978 1,730 3,530
1,000 25 53 100 206 309 595 948 1,680 3,420
1,100 25 52 97 200 300 578 921 1,630 3,320
1,200 24 50 95 195 292 562 895 1,580 3,230
1,300 23 48 90 185 277 534 850 1,500 3,070
1,400 22 46 86 176 264 509 81 1 1,430 2,930
1,500 21 44 82 169 253 487 777 1,370 2,800
1,600 20 42 79 162 243 468 746 1,320 2,690
1,700 19 40 76 156 234 451 719 1,270 2,590
1,800 19 39 74 151 226 436 694 1,230 2,500
1,900 18 38 71 146 219 422 672 1,190 2,420
2,000 18 37 69 142 212 409 652 1,150 2,350
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
57
TABLE 402.4(29)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 10.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
TUBE SIZE (in.)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 513 1,060 2,150 3,760 5,330 11,400 20,500 32,300 67,400
20 352 727 1,480 2,580 3,670 7,830 14,100 22,200 46,300
30 283 584 1,190 2,080 2,940 6,290 11,300 17,900 37,200
40 242 500 1,020 1,780 2,520 5,380 9,690 15,300 31,800
50 215 443 901 1,570 2,230 4,770 8,590 13,500 28,200
60 194 401 816 1,430 2,020 4,320 7,780 12,300 25,600
70 179 369 751 1,310 1,860 3,980 7,160 11,300 23,500
80 166 343 699 1,220 1,730 3,700 6,660 10,500 21,900
90 156 322 655 1,150 1,630 3,470 6,250 9,850 20,500
100 147 304 619 1,080 1,540 3,280 5,900 9,310 19,400
125 131 270 549 959 1,360 2,910 5,230 8,250 17,200
150 118 244 497 869 1,230 2,630 4,740 7,470 15,600
175 109 225 457 799 1,130 2,420 4,360 6,880 14,300
200 101 209 426 744 1,060 2,250 4,060 6,400 13,300
250 90 185 377 659 935 2,000 3,600 5,670 11,800
300 81 168 342 597 847 1,810 3,260 5,140 10,700
350 75 155 314 549 779 1,660 3,000 4,730 9,840
400 70 144 292 511 725 1,550 2,790 4,400 9,160
450 65 135 274 480 680 1,450 2,620 4,130 8,590
500 62 127 259 453 643 1,370 2,470 3,900 8,120
550 59 121 246 430 610 1,300 2,350 3,700 7,710
600 56 115 235 410 582 1,240 2,240 3,530 7,350
650 54 111 225 393 558 1,190 2,140 3,380 7,040
700 51 106 216 378 536 1,140 2,060 3,250 6,770
750 50 102 208 364 516 1,100 1,980 3,130 6,520
800 48 99 201 351 498 1,060 1,920 3,020 6,290
850 46 96 195 340 482 1,030 1,850 2,920 6,090
900 45 93 189 330 468 1,000 1,800 2,840 5,910
950 44 90 183 320 454 970 1,750 2,750 5,730
1,000 42 88 178 311 442 944 1,700 2,680 5,580
1,100 40 83 169 296 420 896 1,610 2,540 5,300
1,200 38 79 161 282 400 855 1,540 2,430 5,050
1,300 37 76 155 270 383 819 1,470 2,320 4,840
1,400 35 73 148 260 368 787 1,420 2,230 4,650
1,500 34 70 143 250 355 758 1,360 2,150 4,480
1,600 33 68 138 241 343 732 1,320 2,080 4,330
1,700 32 66 134 234 331 708 1,270 2,010 4,190
1,800 31 64 130 227 321 687 1,240 1,950 4,060
1,900 30 62 126 220 312 667 1,200 1,890 3,940
2,000 29 60 122 214 304 648 1,170 1,840 3,830
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
58
TABLE 402.4(30)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 11.0 in. W.C.
Pressure Drop 0.5 in. W.C.
Specific Gravity 1.50
INTENDED USE Sizing between single or second stage (low-pressure regulator) and appliance.
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 45 93 188 329 467 997 1,800 2,830 5,890
20 31 64 129 226 321 685 1,230 1,950 4,050
30 25 51 104 182 258 550 991 1,560 3,250
40 21 44 89 155 220 471 848 1,340 2,780
50 19 39 79 138 195 417 752 1,180 2,470
60 17 35 71 125 177 378 681 1,070 2,240
70 16 32 66 115 163 348 626 988 2,060
80 15 30 61 107 152 324 583 919 1,910
90 14 28 57 100 142 304 547 862 1,800
100 13 27 54 95 134 287 517 814 1,700
125 11 24 48 84 119 254 458 722 1,500
150 10 21 44 76 108 230 415 654 1,360
175 NA 20 40 70 99 212 382 602 1,250
200 NA 18 37 65 92 197 355 560 1,170
250 NA 16 33 58 82 175 315 496 1,030
300 NA 15 30 52 74 158 285 449 936
350 NA 14 28 48 68 146 262 414 861
400 NA 13 26 45 63 136 244 385 801
450 NA 12 24 42 60 127 229 361 752
500 NA 11 23 40 56 120 216 341 710
550 NA 11 22 38 53 114 205 324 674
600 NA 10 21 36 51 109 196 309 643
650 NA NA 20 34 49 104 188 296 616
700 NA NA 19 33 47 100 180 284 592
750 NA NA 18 32 45 96 174 274 570
800 NA NA 18 31 44 93 168 264 551
850 NA NA 17 30 42 90 162 256 533
900 NA NA 17 29 41 87 157 248 517
950 NA NA 16 28 40 85 153 241 502
1,000 NA NA 16 27 39 83 149 234 488
1,100 NA NA 15 26 37 78 141 223 464
1,200 NA NA 14 25 35 75 135 212 442
1,300 NA NA 14 24 34 72 129 203 423
1,400 NA NA 13 23 32 69 124 195 407
1,500 NA NA 13 22 31 66 119 188 392
1,600 NA NA 12 21 30 64 115 182 378
1,700 NA NA 12 20 29 62 112 176 366
1,800 NA NA 11 20 28 60 108 170 355
1,900 NA NA 11 19 27 58 105 166 345
2,000 NA NA 11 19 27 57 102 161 335
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 -inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a How of less than 10,000 Btu/hr.
  3. All table entries have been rounded to three significant digits.
59
TABLE 402.4(31)
SEMIRIGID COPPER TUBING
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE Tube sizing between 2 psig service and line pressure regulator.
TUBE SIZE (inch)
Nominal K & L ¼ ½ ¾ 1 2
ACR ½ ¾ 1⅛ 1⅜
Outside 0.375 0.500 0.625 0.750 0.875 1.125 1.375 1.625 2.125
Inside 0.305 0.402 0.527 0.652 0.745 0.995 1.245 1.481 1.959
Length (ft) Capacity in Thousands of Btu per Hour
10 413 852 1,730 3,030 4,300 9,170 16,500 26,000 54,200
20 284 585 1,190 2,080 2,950 6,310 11,400 17,900 37,300
30 228 470 956 1,670 2,370 5,060 9,120 14,400 29,900
40 195 402 818 1,430 2,030 4,330 7,800 12,300 25,600
50 173 356 725 1,270 1,800 3,840 6,920 10,900 22,700
60 157 323 657 1,150 1,630 3,480 6,270 9,880 20,600
70 144 297 605 1,060 1,500 3,200 5,760 9,090 18,900
80 134 276 562 983 1,390 2,980 5,360 8,450 17,600
90 126 259 528 922 1,310 2,790 5,030 7,930 16,500
100 119 245 498 871 1,240 2,640 4,750 7,490 15,600
125 105 217 442 772 1,100 2,340 4,210 6,640 13,800
150 95 197 400 700 992 2,120 3,820 6,020 12,500
175 88 181 368 644 913 1,950 3,510 5,540 11,500
200 82 168 343 599 849 1,810 3,270 5,150 10,700
250 72 149 304 531 753 1,610 2,900 4,560 9,510
300 66 135 275 481 682 1,460 2,620 4,140 8,610
350 60 124 253 442 628 1,340 2,410 3,800 7,920
400 56 116 235 411 584 1,250 2,250 3,540 7,370
450 53 109 221 386 548 1,170 2,110 3,320 6,920
500 50 103 209 365 517 1,110 1,990 3,140 6,530
550 47 97 198 346 49,1 1,050 1,890 2,980 6,210
600 45 93 189 330 469 1,000 1,800 2,840 5,920
650 43 89 181 316 449 959 1,730 2,720 5,670
700 41 86 174 304 431 921 1,660 2,620 5,450
750 40 82 168 293 415 888 1,600 2,520 5,250
800 39 80 162 283 401 857 1,540 2,430 5,070
850 37 77 157 274 388 829 1,490 2,350 4,900
900 36 75 152 265 376 804 1,450 2,280 4,750
950 35 72 147 258 366 781 1,410 2,220 4,620
1,000 34 71 143 251 356 760 1,370 2,160 4,490
1,100 32 67 136 238 338 721 1,300 2,050 4,270
1,200 31 64 130 227 322 688 1,240 1,950 4,070
1,300 30 61 124 217 309 659 1,190 1,870 3,900
1,400 28 59 120 209 296 633 1,140 1,800 3,740
1,500 27 57 115 201 286 610 1,100 1,730 3,610
1,600 26 55 111 194 276 589 1,060 1,670 3,480
1,700 26 53 108 188 267 570 1,030 1,620 3,370
1,800 25 51 104 182 259 553 1,000 1,570 3,270
1,900 24 50 101 177 251 537 966 1,520 3,170
2,000 23 48 99 172 244 522 940 1,480 3,090
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.
60
TABLE 402.4(32)
CORRUGATED STAINLESS STEEL TUBING(CSST)
  Gas Undiluted Propane
Inlet Pressure 11.0 in. W.C.
Pressure Drop 0.5 in. W.C.
Specific Gravity 1.50
INTENDED USE: SIZING BETWEEN SINGLE OR SECOND STAGE (Low Pressure) REGULATOR AND THE APPLIANCE SHUTOFF VALVE
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
5 72 99 181 211 355 426 744 863 1,420 1,638 2,830 3,270 5,780 6,550
10 50 69 129 150 254 303 521 605 971 1,179 1,990 2,320 4,110 4,640
15 39 55 104 121 208 248 422 490 775 972 1,620 1,900 3,370 3,790
20 34 49 91 106 183 216 365 425 661 847 1,400 1,650 2,930 3,290
25 30 42 82 94 164 192 325 379 583 762 1,250 1,480 2,630 2,940
30 28 39 74 87 151 177 297 344 528 698 1,140 1,350 2,400 2,680
40 23 33 64 74 131 153 256 297 449 610 988 1,170 2,090 2,330
50 20 30 58 66 118 137 227 265 397 548 884 1,050 1,870 2,080
60 19 26 53 60 107 126 207 241 359 502 805 961 1,710 1,900
70 17 25 49 57 99 117 191 222 330 466 745 890 1,590 1,760
80 15 23 45 52 94 109 178 208 307 438 696 833 1,490 1,650
90 15 22 44 50 90 102 169 197 286 414 656 787 1,400 1,550
100 14 20 41 47 85 98 159 186 270 393 621 746 1,330 1,480
150 11 15 31 36 66 75 123 143 217 324 506 611 1,090 1,210
200 9 14 28 33 60 69 112 129 183 283 438 531 948 1,050
250 8 12 25 30 53 61 99 117 163 254 390 476 850 934
300 8 11 23 26 50 57 90 107 147 234 357 434 777 854
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa. 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  2. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  3. All table entries have been rounded to three significant digits.
61
TABLE 402.4(33)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE: SIZING BETWEEN 2 PSI SERVICE AND THE LINE PRESSURE REGULATOR
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
10 426 558 927 1,110 1,740 2,170 4,100 4,720 7,130 7,958 15,200 16,800 29,400 34,200
25 262 347 591 701 1,120 1,380 2,560 2,950 4,560 5,147 9,550 10,700 18,800 21,700
30 238 316 540 640 1,030 1,270 2,330 2,690 4,180 4,719 8,710 9,790 17,200 19,800
40 203 271 469 554 896 1,100 2,010 2,320 3,630 4,116 7,530 8,500 14,900 17,200
50 181 243 420 496 806 986 1,790 2,070 3,260 3,702 6,730 7,610 13,400 15,400
75 147 196 344 406 663 809 1,460 1,690 2,680 3,053 5,480 6,230 11,000 12,600
80 140 189 333 393 643 768 1,410 1,630 2,590 2,961 5,300 6,040 10,600 12,200
100 124 169 298 350 578 703 1,260 1,450 2,330 2,662 4,740 5,410 9,530 10,900
150 101 137 245 287 477 575 1,020 1,180 1,910 2,195 3,860 4,430 7,810 8,890
200 86 118 213 248 415 501 880 1,020 1,660 1,915 3,340 3,840 6,780 7,710
250 77 105 191 222 373 448 785 910 1,490 1,722 2,980 3,440 6,080 6,900
300 69 96 173 203 343 411 716 829 1,360 1,578 2,720 3,150 5,560 6,300
400 60 82 151 175 298 355 616 716 1,160 1,376 2,350 2,730 4,830 5,460
500 53 72 135 158 268 319 550 638 1,030 1,237 2,100 2,450 4,330 4,880
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds ½, psi (based on 13 in. w.c. outlet pressure), DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
62
TABLE 402.4(34)
CORRUGATED STAINLESS STEEL TUBING (CSST)
  Gas Undiluted Propane
Inlet Pressure 5.0 psi
Pressure Drop 3.5 psi
Specific Gravity 1.50
TUBE SIZE (EHD)
Flow Designation 13 15 18 19 23 25 30 31 37 39 46 48 60 62
Length (ft) Capacity in Thousands of Btu per Hour
10 826 1,070 1,710 2,060 3,150 4,000 7,830 8,950 13,100 14,441 28,600 31,200 54,400 63,800
25 509 664 1,090 1,310 2,040 2,550 4,860 5,600 8,400 9,339 18,000 19,900 34,700 40,400
30 461 603 999 1,190 1,870 2,340 4,430 5,100 7,680 8,564 16,400 18,200 31,700 36,900
40 396 520 867 1,030 1,630 2,030 3,820 4,400 6,680 7,469 14,200 15,800 27,600 32,000
50 352 463 777 926 1,460 1,820 3,410 3,930 5,990 6,717 12,700 14,100 24,700 28,600
75 284 376 637 757 1,210 1,490 2,770 3,190 4,920 5,539 10,300 11,600 20,300 23,400
80 275 363 618 731 1,170 1,450 2,680 3,090 4,770 5,372 9,990 11,200 19,600 22,700
100 243 324 553 656 1,050 1,300 2,390 2,760 4,280 4,830 8,930 10,000 17,600 20,300
150 196 262 453 535 866 1,060 1,940 2,240 3,510 3,983 7,270 8,210 14,400 16,600
200 169 226 393 464 755 923 1,680 1,930 3,050 3,474 6,290 7,130 12,500 14,400
250 150 202 352 415 679 828 1,490 1,730 2,740 3,124 5,620 6,390 11,200 12,900
300 136 183 322 379 622 757 1,360 1,570 2,510 2,865 5,120 5,840 10,300 11,700
400 117 158 279 328 542 657 1,170 1,360 2,180 2,498 4,430 5,070 8,920 10,200
500 104 140 251 294 488 589 1,050 1,210 1,950 2,247 3,960 4,540 8,000 9,110
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa. 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
  1. Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drop across regulator may vary with the flow rate.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends.
  4. EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
  5. All table entries have been rounded to three significant digits.
63
TABLE 402.4(35)
POLYETHYLENE PLASTIC PIPE
  Gas Undiluted Propane
Inlet Pressure 11.0 in. W.C.
Pressure Drop 0.5 in. W.C.
Specific Gravity 1.50
INTENDED USE PE pipe sizing between integral two-stage regulator at tank or second stage (low-pressure regulator) and building.
PIPE SIZE (inch)
Nominal ½ ¾ 1 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR ll SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Thousands of Btu per Hour
10 340 680 1,230 2,130 3,210 5,770 16,000 30,900
20 233 468 844 1,460 2,210 3,970 11,000 21,200
30 187 375 677 1,170 1,770 3,180 8,810 17,000
40 160 321 580 1,000 1,520 2,730 7,540 14,600
50 142 285 514 890 1,340 2,420 6,680 12,900
60 129 258 466 807 1,220 2,190 6,050 11,700
70 119 237 428 742 1,120 2,010 5,570 10,800
80 110 221 398 690 1,040 1,870 5,180 10,000
90 103 207 374 648 978 1,760 4,860 9,400
100 98 196 353 612 924 1,660 4,590 8,900
125 87 173 313 542 819 1,470 4,070 7,900
150 78 157 284 491 742 1,330 3,690 7,130
175 72 145 261 452 683 1,230 3,390 6,560
200 67 135 243 420 635 1,140 3,160 6,100
250 60 119 215 373 563 1,010 2,800 5,410
300 54 108 195 338 510 916 2,530 4,900
350 50 99 179 311 469 843 2,330 4,510
400 46 92 167 289 436 784 2,170 4,190
450 43 87 157 271 409 736 2,040 3,930
500 41 82 148 256 387 695 1,920 3,720
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
64
TABLE 402.4(36)
POLYETHYLENE PLASTIC PIPE
  Gas Undiluted Propane
Inlet Pressure 2.0 psi
Pressure Drop 1.0 psi
Specific Gravity 1.50
INTENDED USE PE pipe sizing between 2 psig service regulator and line pressure regulator.
PIPE SIZE (inch)
Nominal OD ½ ¾ 1 2 3 4
Designation SDR 9 SDR 11 SDR 11 SDR 10 SDR 11 SDR 11 SDR ll SDR 11
Actual ID 0.660 0.860 1.077 1.328 1.554 1.943 2.864 3.682
Length (ft) Capacity in Thousands of Btu per Hour
10 3,130 6,260 11,300 19,600 29,500 53,100 147,000 284,000
20 2,150 4,300 7,760 13,400 20,300 36,500 101,000 195,000
30 1,730 3,450 6,230 10,800 16,300 29,300 81,100 157,000
40 1,480 2,960 5,330 9,240 14,000 25,100 69,400 134,100
50 1,310 2,620 4,730 8,190 12,400 22,200 61,500 119,000
60 1,190 2,370 4,280 7,420 11,200 20,100 55,700 108,000
70 1,090 2,180 3,940 6,830 10,300 18,500 51,300 99,100
80 1,010 2,030 3,670 6,350 9,590 17,200 47,700 92,200
90 952 1,910 3,440 5,960 9,000 16,200 44,700 86,500
100 899 1,800 3,250 5,630 8,500 15,300 42,300 81,700
125 797 1,600 2,880 4,990 7,530 13,500 37,500 72,400
150 722 1,450 2,610 4,520 6,830 12,300 33,900 65,600
175 664 1,330 2,400 4,160 6,280 11,300 31,200 60,300
200 618 1,240 2,230 3,870 5,840 10,500 29,000 56,100
250 548 1,100 1,980 3,430 5,180 9,300 25,700 49,800
300 496 994 1,790 3,110 4,690 8,430 23,300 45,100
350 457 914 1,650 2,860 4,320 7,760 21,500 41,500
400 425 851 1,530 2,660 4,020 7,220 12,000 38,600
450 399 798 1,440 2,500 3,770 6,770 18,700 36,200
500 377 754 1,360 2,360 3,560 6,390 17,700 34,200
550 358 716 1,290 2,240 3,380 6,070 16,800 32,500
600 341 683 1,230 2,140 3,220 5,790 16,000 31,000
650 327 654 1,180 2,040 3,090 5,550 15,400 29,700
700 314 628 1,130 1,960 2,970 5,330 14,700 28,500
750 302 605 1,090 1,890 2,860 5,140 14,200 27,500
800 292 585 1,050 1,830 2,760 4,960 13,700 26,500
850 283 566 1,020 1,770 2,670 4,800 13,300 25,700
900 274 549 990 1,710 2,590 4,650 12,900 24,900
950 266 533 961 1,670 2,520 4,520 12,500 24,200
1,000 259 518 935 1,620 2,450 4,400 12,200 23,500
1,100 246 492 888 1,540 2,320 4,170 11,500 22,300
1,200 234 470 847 1,470 2,220 3,980 11,000 21,300
1,300 225 450 811 1,410 2,120 3,810 10,600 20,400
1,400 216 432 779 1,350 2,040 3,660 10,100 19,600
1,500 208 416 751 1,300 1,960 3,530 9,760 18,900
1,600 201 402 725 1,260 1,900 3,410 9,430 18,200
1,700 194 389 702 1,220 1,840 3,300 9,130 17,600
1,800 188 377 680 1,180 1,780 3,200 8,850 17,100
1,900 183 366 661 1,140 1,730 3,110 8,590 16,600
2,000 178 356 643 1,110 1,680 3,020 8,360 16,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
65
TABLE 402.4(37)
POLYETHYLENE PLASTIC TUBING
  Gas Undiluted Propane
Inlet Pressure 11.0 in. W.C.
Pressure Drop 0.5 in. W.C.
Specific Gravity 1.50
INTENDED USE PE pipe sizing between integral two-stage regulator at tank or second stage (low-pressure regulator) and building.
Plastic Tubing Size (CTS) (inch)
Nominal OD ½ 1
Designation SDR 7 SDR 11
Actual ID 0.445 0.927
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 121 828
20 83 569
30 67 457
40 57 391
50 51 347
60 46 314
70 42 289
80 39 269
90 37 252
100 35 238
125 31 211
150 28 191
175 26 176
200 24 164
225 22 154
250 21 145
275 20 138
300 19 132
350 18 121
400 16 113
450 15 106
500 15 100
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,
            1 pound per square inch = 6.895 kPa,
            1-inch water column = 0.2488 kPa,
            1 British thermal unit per hour = 0.293 1 W,
            1 cubic foot per hour = 0.0283 m3/h, I degree = 0.0 1745 rad.
Note: All table entries have been rounded to three significant digits.
66

402.6 Maximum design operating pressure. The maximum design operating pressure for piping systems located inside buildings shall not exceed 5 pounds per square inch gauge (psig) (34 kPa gauge) except where one or more of the following conditions are met:

  1. The piping system is welded.
  2. The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.
  3. The piping is located inside buildings or separate areas of buildings used exclusively for:

    3.1. Industrial processing or heating;

    3.2. Research;

    3.3. Warehousing; or

    3.4. Boiler or mechanical rooms.

  4. The piping is a temporary installation for buildings under construction.
  5. The piping serves appliances or equipment used for agricultural purposes.
  6. The piping system is an LP-gas piping system with a design operating pressure greater than 20 psi (137.9 kPa) and complies with NFPA 58.

402.6.1 Liquefied petroleum gas systems. LP-gas systems designed to operate below −5°F (−21 °C) or with butane or a propane-butane mix shall be designed to either accommodate liquid LP-gas or prevent LP-gas vapor from condensing into a liquid.

SECTION 403 (IFGS)
PIPING MATERIALS

403.1 General. Materials used for piping systems shall comply with the requirements of this chapter or shall be approved.

403.2 Used materials. Pipe, fittings, valves and other materials shall not be used again except where they are free of foreign materials and have been ascertained to be adequate for the service intended.

403.3 Other materials. Material not covered by the standards specifications listed herein shall be investigated and tested to determine that it is safe and suitable for the proposed service, and, in addition, shall be recommended for that service by the manufacturer and shall be approved by the code official.

403.4 Metallic pipe. Metallic pipe shall comply with Sections 403.4.1 through 403.4.4.

403.4.1 Cast iron. Cast-iron pipe shall not be used.

403.4.2 Steel. Steel and wrought-iron pipe shall be at least of standard weight (Schedule 40) and shall comply with one of the following standards:

  1. ASME B36.10, 10M;
  2. ASTM A 53/A53M; or
  3. ASTM A 106.

403.4.3 Copper and brass. Copper and brass pipe shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet of gas (0.7 milligrams per 100 liters). Threaded copper, brass and aluminum-alloy pipe shall not be used with gases corrosive to such materials.

403.4.4 Aluminum. Aluminum-alloy pipe shall comply with ASTM B 241 (except that the use of alloy 5456 is prohibited), and shall be marked at each end of each length indicating compliance. Aluminum-alloy pipe shall be coated to protect against external corrosion where it is in contact with masonry, plaster or insulation, or is subject to repeated wettings by such liquids as water, detergents or sewage. Aluminum-alloy pipe shall not be used in exterior locations or underground.

403.5 Metallic tubing. Seamless copper, aluminum alloy and steel tubing shall not be used with gases corrosive to such materials.

403.5.1 Steel tubing. Steel tubing shall comply with ASTM A 254.

403.5.2 Copper and brass tubing. Copper tubing shall comply with Standard Type K or L of ASTM B 88 or ASTM B 280.

Copper and brass tubing shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet of gas (0.7 milligrams per 100 liters).

403.5.3 Aluminum tubing. Aluminum-alloy tubing shall comply with ASTM B 210 or ASTM B 241. Aluminum-alloy tubing shall be coated to protect against external corrosion where it is in contact with masonry, plaster or insulation, or is subject to repeated wettings by such liquids as water, detergent or sewage.

Aluminum-alloy tubing shall not be used in exterior locations or underground.

403.5.4 Corrugated stainless steel tubing. Corrugated stainless steel tubing shall be listed in accordance with ANSI LC 1/CSA 6.26.

403.6 Plastic pipe, tubing and fittings. Polyethylene plastic pipe, tubing and fittings used to supply fuel gas shall conform to the 2009 edition of ASTM D 2513. Such pipe shall be marked “Gas” and “ASTM D 2513.”

Plastic pipe, tubing and fittings, other than polyethylene, 1 shall be identified and conform to the 2008 edition of ASTM D 2513. Such pipe shall be marked “Gas” and “ASTM D 2513.”

403.6.1 Anodeless risers. Plastic pipe, tubing and anode-less risers shall comply with the following:

  1. Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures.
  2. Service head adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used, and shall be designed and certified to meet the requirements of Category I of the 2009 edition of ASTM D 2513, and U.S. Department of Transportation,67 Code of Federal Regulations, Title 49, Part 192.281(e). The manufacturer shall provide the user with qualified installation instructions as prescribed by the U.S. Department of Transportation, Code of Federal Regulations, Title 49, Part 192.283(b).

403.6.2 LP-gas systems. The use of plastic pipe, tubing and fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with NFPA 58.

403.6.3 Regulator vent piping. Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be PVC conforming to ANSI/UL 651. PVC vent piping shall not be installed indoors.

403.7 Workmanship and defects. Pipe, tubing and fittings shall be clear and free from cutting burrs and defects in structure or threading, and shall be thoroughly brushed, and chip and scale blown.

Defects in pipe, tubing and fittings shall not be repaired. Defective pipe, tubing and fittings shall be replaced.

403.8 Protective coating. Where in contact with material or atmosphere exerting a corrosive action, metallic piping and fittings coated with a corrosion-resistant material shall be used. External or internal coatings or linings used on piping or components shall not be considered as adding strength.

403.9 Metallic pipe threads. Metallic pipe and fitting threads shall be taper pipe threads and shall comply with ASME B1.20.1.

403.9.1 Damaged threads. Pipe with threads that are stripped, chipped, corroded or otherwise damaged shall not be used. Where a weld opens during the operation of cutting or threading, that portion of the pipe shall not be used.

403.9.2 Number of threads. Field threading of metallic pipe shall be in accordance with Table 403.9.2.

TABLE 403.9.2
SPECIFICATIONS FOR THREADING METALLIC PIPE
IRON PIPE SIZE (inches) APPROXIMATE LENGTH OF THREADED PORTION (inches) APPROXIMATE NUMBER OF THREADS TO BE CUT
½ ¾ 10
¾ ¾ 10
1 10
1 11
1 11
2 1 11
12
3 12
4 1⅝ 13
For SI: 1 inch = 25.4 mm.

403.9.3 Thread joint compounds. Thread joint compounds shall be resistant to the action of liquefied petroleum gas or to any other chemical constituents of the gases to be conducted through the piping.

403.10 Metallic piping joints and fittings. The type of piping joint used shall be suitable for the pressure-temperature conditions and shall be selected giving consideration to joint tightness and mechanical strength under the service conditions. The joint shall be able to sustain the maximum end force caused by the internal pressure and any additional forces caused by temperature expansion or contraction, vibration, fatigue or the weight of the pipe and its contents.

403.10.1 Pipe joints. Pipe joints shall be threaded, flanged, brazed or welded. Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1,000°F (538°C). Brazing alloys shall not contain more than 0.05-percent phosphorus.

403.10.2 Tubing joints. Tubing joints shall be made with approved gas tubing fittings, brazed with a material having a melting point in excess of 1,000°F (538°C) or made with press-connect fittings complying with ANSI LC-4. Brazing alloys shall not contain more than 0.05-percent phosphorus.

403.10.3 Flared joints. Flared joints shall be used only in systems constructed from nonferrous pipe and tubing where experience or tests have demonstrated that the joint is suitable for the conditions and where provisions are made in the design to prevent separation of the joints.

403.10.4 Metallic fittings. Metallic fittings shall comply with the following:

  1. Threaded fittings in sizes larger than 4 inches (102 mm) shall not be used except where approved.
  2. Fittings used with steel or wrought-iron pipe shall be steel, brass, bronze, malleable iron or cast iron.
  3. Fittings used with copper or brass pipe shall be copper, brass or bronze.
  4. Fittings used with aluminum-alloy pipe shall be of aluminum alloy.
  5. Cast-iron fittings:

    5.1. Flanges shall be permitted.

    5.2. Bushings shall not be used.

    5.3. Fittings shall not be used in systems containing flammable gas-air mixtures.

    5.4. Fittings in sizes 4 inches (102 mm) and larger shall not be used indoors except where approved.

    5.5. Fittings in sizes 6 inches (152 mm) and larger shall not be used except where approved.

  6. Aluminum-alloy fittings. Threads shall not form the joint seal.
  7. Zinc aluminum-alloy fittings. Fittings shall not be used in systems containing flammable gas-air mixtures.
  8. Special fittings. Fittings such as couplings, proprietary-type joints, saddle tees, gland-type compression fittings, and flared, flareless or compression-type68 tubing fittings shall be: used within the fitting manufacturer’s pressure-temperature recommendations; used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion or contraction; installed or braced to prevent separation of the joint by gas pressure or external physical damage; and shall be approved.

403.11 Plastic pipe, joints and fittings. Plastic pipe, tubing and fittings shall be joined in accordance with the manufacturer’s instructions. Such joint shall comply with the following:

  1. The joint shall be designed and installed so that the longitudinal pull-out resistance of the joint will be at least equal to the tensile strength of the plastic piping material.
  2. Heat-fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gas-tight joints at least as strong as the pipe or tubing being joined. Joints shall be made with the joining method recommended by the pipe manufacturer. Heat fusion fittings shall be marked “ASTM D 2513.”
  3. Where compression-type mechanical joints are used, the gasket material in the fitting shall be compatible with the plastic piping and with the gas distributed by the system. An internal tubular rigid stiffener shall be used in conjunction with the fitting. The stiffener shall be flush with the end of the pipe or tubing and shall extend at least to the outside end of the compression fitting when installed. The stiffener shall be free of rough or sharp edges and shall not be a force fit in the plastic. Split tubular stiffeners shall not be used.
  4. Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with NFPA 58.

403.12 Flanges. All flanges shall comply with ASME B 16.1, ASME B 16.20 or MSS SP-6. The pressure-temperature ratings shall equal or exceed that required by the application.

403.12.1 Flange facings. Standard facings shall be permitted for use under this code. Where 150-pound (1034 kPa) pressure-rated steel flanges are bolted to Class 125 cast-iron flanges, the raised face on the steel flange shall be removed.

403.12.2 Lapped flanges. Lapped flanges shall be used only above ground or in exposed locations accessible for inspection.

403.13 Flange gaskets. Material for gaskets shall be capable of withstanding the design temperature and pressure of the piping system, and the chemical constituents of the gas being conducted, without change to its chemical and physical properties. The effects of fire exposure to the joint shall be considered in choosing material. Acceptable materials include metal (plain or corrugated), composition, and aluminum “O” rings and spiral wound metal gaskets. When a flanged joint is opened, the gasket shall be replaced. Full-face gaskets shall be used with all bronze and cast-iron flanges.

SECTION 404 (IFGC)
PIPING SYSTEM INSTALLATION

404.1 Installation of materials. All materials used shall be installed in strict accordance with the standards under which the materials are accepted and approved. In the absence of such installation procedures, the manufacturer’s instructions shall be followed. Where the requirements of referenced standards or manufacturer’s instructions do not conform to minimum provisions of this code, the provisions of this code shall apply.

404.2 CSST. CSST piping systems shall be installed in accordance with the terms of their approval, the conditions of listing, the manufacturer’s instructions and this code.

404.3 Prohibited locations. Piping shall not be installed in or through a ducted supply, return or exhaust, or a clothes chute, chimney or gas vent, dumbwaiter or elevator shaft. Piping installed downstream of the point of delivery shall not extend through any townhouse unit other than the unit served by such piping.

404.4 Piping in solid partitions and walls. Concealed piping shall not be located in solid partitions and solid walls, unless installed in a chase or casing.

404.5 Piping in concealed locations. Portions of a piping system installed in concealed locations shall not have unions, tubing fittings, right and left couplings, bushings, compression couplings and swing joints made by combinations of fittings.

Exceptions:

  1. Tubing joined by brazing.
  2. Fittings listed for use in concealed locations.

404.6 Underground penetrations prohibited. Gas piping shall not penetrate building foundation walls at any point below grade. Gas piping shall enter and exit a building at a point above grade and the annular space between the pipe and the wall shall be sealed.

404.7 Protection against physical damage. In concealed locations, where piping other than black or galvanized steel is installed through holes or notches in wood studs, joists, rafters or similar members less than l½ inches (38 mm) from the nearest edge of the member, the pipe shall be protected by shield plates. Protective steel shield plates having a minimum thickness of 0.0575 inch (1.463 mm) (No. 16 gage) shall cover the area of the pipe where the member is notched or bored and shall extend a minimum of 4 inches (102 mm) above sole plates, below top plates and to each side of a stud, joist or rafter.

404.8 Piping in solid floors. Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum amount of damage to the building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. As an alternative to installation in channels, the piping shall be installed in a conduit of Schedule 40 steel, wrought iron, PVC or ABS pipe in accordance with Section 404.8.1 or 404.8.2.

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404.8.1 Conduit with one end terminating outdoors. The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. If the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as prevent the entrance of water and insects.

404.8.2 Conduit with both ends terminating indoors. Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.

404.9 Above-ground outdoor piping. All piping installed outdoors shall be elevated not less than 3½ inches (152 mm) above ground and where installed across roof surfaces, shall be elevated not less than 3½ inches (152 mm) above the roof surface. Piping installed above ground, outdoors, and installed across the surface of roofs shall be securely supported and located where it will be protected from physical damage. Where passing through an outside wall, the piping shall also be protected against corrosion by coating or wrapping with an inert material. Where piping is encased in a protective pipe sleeve, the annular space between the piping and the sleeve shall be sealed.

404.10 Isolation. Metallic piping and metallic tubing that conveys fuel gas from an LP-gas storage container shall be provided with an approved dielectric fitting to electrically isolate the underground portion of the pipe or tube from the above ground portion that enters a building. Such dielectric fitting shall be installed above ground, outdoors.

404.11 Protection against corrosion. Metallic pipe or tubing exposed to corrosive action, such as soil condition or moisture, shall be protected in an approved manner. Zinc coatings (galvanizing) shall not be deemed adequate protection for gas piping underground. Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used. Piping shall not be laid in contact with cinders.

404.11.1 Prohibited use. Uncoated threaded or socket welded joints shall not be used in piping in contact with soil or where internal or external crevice corrosion is known to occur.

404.11.2 Protective coatings and wrapping. Pipe protective coatings and wrappings shall be approved for the application and shall be factory applied.

Exception: Where installed in accordance with the manufacturer’s installation instructions, field application of coatings and wrappings shall be permitted for pipe nipples, fittings and locations where the factory coating or wrapping has been damaged or necessarily removed at joints.

404.12 Minimum burial depth. Underground piping systems shall be installed a minimum depth of 12 inches (305 mm) below grade, except as provided for in Section 404.12.1.

404.12.1 Individual outside appliances. Individual lines to outside lights, grills or other appliances shall be installed a minimum of 8 inches (203 mm) below finished grade, provided that such installation is approved and is installed in locations not susceptible to physical damage.

404.13 Trenches. The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench.

404.14 Piping underground beneath buildings. Piping installed underground beneath buildings is prohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, steel pipe or other approved conduit material designed to withstand the superimposed loads. The conduit shall be protected from corrosion in accordance with Section 404.11 and shall be installed in accordance with Section 404.14.1 or 404.14.2.

404.14.1 Conduit with one end terminating outdoors. The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside of the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.

404.14.2 Conduit with both ends terminating indoors. Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.

404.15 Outlet closures. Gas outlets that do not connect to appliances shall be capped gas tight.

Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer’s installation instructions.

404.16 Location of outlets. The unthreaded portion of piping outlets shall extend not less than 1 inch (25 mm) through finished ceilings and walls and where extending through floors or outdoor patios and slabs, shall not be less than 2 inches (51 mm) above them. The outlet fitting or piping shall be securely supported. Outlets shall not be placed behind doors. Outlets

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shall be located in the room or space where the appliance is installed.

Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer’s installation instructions.

404.17 Plastic pipe. The installation of plastic pipe shall comply with Sections 404.17.1 through 404.17.3.

404.17.1 Limitations. Plastic pipe shall be installed outdoors underground only. Plastic pipe shall not be used within or under any building or slab or be operated at pressures greater than 100 psig (689 kPa) for natural gas or 30 psig (207 kPa) for LP-gas.

Exceptions:

  1. Plastic pipe shall be permitted to terminate above ground outside of buildings where installed in premanufactured anodeless risers or service head adapter risers that are installed in accordance with the manufacturer’s installation instructions.
  2. Plastic pipe shall be permitted to terminate with a wall head adapter within buildings where the plastic pipe is inserted in a piping material for fuel gas use in buildings.
  3. Plastic pipe shall be permitted under outdoor patio, walkway and driveway slabs provided that the burial depth complies with Section 404.12.

404.17.2 Connections. Connections made outdoors and underground between metallic and plastic piping shall be made only with transition fittings conforming with ASTM D 2513 Category I or ASTM F 1973.

404.17.3 Tracer. A yellow insulated copper tracer wire or other approved conductor shall be installed adjacent to underground nonmetallic piping. Access shall be provided to the tracer wire or the tracer wire shall terminate above ground at each end of the nonmetallic piping. The tracer wire size shall not be less than 18 AWG and the insulation type shall be suitable for direct burial.

404.18 Prohibited devices. A device shall not be placed inside the piping or fittings that will reduce the cross-sectional area or otherwise obstruct the free flow of gas.

Exceptions:

  1. Approved gas filters.
  2. An approved fitting or device where the gas piping 1 system has been sized to accommodate the pressure 1 drop of the fitting or device.

404.19 Testing of piping. Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gas tight. Testing, inspection and purging of piping systems shall comply with Section 406.

SECTION 405 (IFGS)
PIPING BENDS AND CHANGES IN DIRECTION

405.1 General. Changes in direction of pipe shall be permitted to be made by the use of fittings, factory bends or field bends.

405.2 Metallic pipe. Metallic pipe bends shall comply with the following:

  1. Bends shall be made only with bending tools and procedures intended for that purpose.
  2. All bends shall be smooth and free from buckling, cracks or other evidence of mechanical damage.
  3. The longitudinal weld of the pipe shall be near the neutral axis of the bend.
  4. Pipe shall not be bent through an arc of more than 90 degrees (1.6 rad).
  5. The inside radius of a bend shall be not less than six times the outside diameter of the pipe.

405.3 Plastic pipe. Plastic pipe bends shall comply with the following:

  1. The pipe shall not be damaged and the internal diameter of the pipe shall not be effectively reduced.
  2. Joints shall not be located in pipe bends.
  3. The radius of the inner curve of such bends shall not be less than 25 times the inside diameter of the pipe.
  4. Where the piping manufacturer specifies the use of special bending tools or procedures, such tools or procedures shall be used.

405.4 Elbows. Factory-made welding elbows or transverse segments cut therefrom shall have an arc length measured along the crotch at least 1 inch (25 mm) in pipe sizes 2 inches (51 mm) and larger.

SECTION 406 (IFGS)
INSPECTION, TESTING AND PURGING

406.1 General. Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication and installation practices comply with the requirements of this code.

406.1.1 Inspections. Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly or pressure tests.

406.1.2 Repairs and additions. In the event repairs or additions are made after the pressure test, the affected piping shall be tested.

Minor repairs and additions are not required to be pressure tested provided that the work is inspected and connections are tested with a noncorrosive leak-detecting fluid or other approved leak-detecting methods.

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406.1.3 New branches. Where new branches are installed to new appliances, only the newly installed branches shall be required to be pressure tested. Connections between the new piping and the existing piping shall be tested with a noncorrosive leak-detecting fluid or other approved leak-detecting methods.

406.1.4 Section testing. A piping system shall be permitted to be tested as a complete unit or in sections. Under no circumstances shall a valve in a line be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, unless two valves are installed in series with a valved “telltale” located between these valves. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve-closing mechanism, is designed to safely withstand the test pressure.

406.1.5 Regulators and valve assemblies. Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication.

406.1.6 Pipe clearing. Prior to testing, the interior of the pipe shall be cleared of all foreign material.

406.2 Test medium. The test medium shall be air, nitrogen, carbon dioxide or an inert gas. Oxygen shall not be used.

406.3 Test preparation. Pipe joints, including welds, shall be left exposed for examination during the test.

Exception: Covered or concealed pipe end joints that have been previously tested in accordance with this code.

406.3.1 Expansion joints. Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test.

406.3.2 Appliance and equipment isolation. Appliances and equipment that are not to be included in the test shall be either disconnected from the piping or isolated by blanks, blind flanges or caps. Flanged joints at which blinds are inserted to blank off other equipment during the test shall not be required to be tested.

406.3.3 Appliance and equipment disconnection. Where the piping system is connected to appliances or equipment designed for operating pressures of less than the test pressure, such appliances or equipment shall be isolated from the piping system by disconnecting them and capping the outlet(s).

406.3.4 Valve isolation. Where the piping system is connected to appliances or equipment designed for operating pressures equal to or greater than the test pressure, such appliances or equipment shall be isolated from the piping system by closing the individual appliance or equipment shutoff valve(s).

406.3.5 Testing precautions. All testing of piping systems shall be performed in a manner that protects the safety of employees and the public during the test.

406.4 Test pressure measurement. Test pressure shall be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five times the test pressure.

406.4.1 Test pressure. The test pressure to be used shall be no less than 1 ½ times the proposed maximum working pressure, but not less than 3 psig (20 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.

406.4.2 Test duration. Test duration shall be not less than ½ hour for each 500 cubic feet (14 m3) of pipe volume or fraction thereof. When testing a system having a volume less than 10 cubic feet (0.28 m3) or a system in a single-family dwelling, the test duration shall be not less than 10 minutes. The duration of the test shall not be required to exceed 24 hours.

406.5 Detection of leaks and defects. The piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects.

Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.

406.5.1 Detection methods. The leakage shall be located by means of an approved gas detector, a noncorrosive leak detection fluid or other approved leak detection methods. Matches, candles, open flames or other methods that could provide a source of ignition shall not be used.

406.5.2 Corrections. Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested.

406.6 Piping system and equipment leakage check. Leakage checking of systems and equipment shall be in accordance with Sections 406.6.1 through 406.6.4.

406.6.1 Test gases. Leak checks using fuel gas shall be permitted in piping systems that have been pressure tested in accordance with Section 406.

406.6.2 Before turning gas on. During the process of turning gas on into a system of new gas piping, the entire system shall be inspected to determine that there are no open fittings or ends and that all valves at unused outlets are closed and plugged or capped.

406.6.3 Leak check. Immediately after the gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping system shall be checked for leakage. Where leakage is indicated, the gas supply shall be shut off until the necessary repairs have been made.

406.6.4 Placing appliances and equipment in operation. Appliances and equipment shall not be placed in operation until after the piping system has been checked for leakage in accordance with Section 406.6.3. the piping system has 1 been purged in accordance with Section 406.7 and the connections to the appliances have been checked for leak-age.

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406.7 Purging. The purging of piping shall be in accordance with Sections 406.7.1 through 406.7.3.

406.7.1 Piping systems required to be purged outdoors. The purging of piping systems shall be in accordance with the provisions of Sections 406.7.1.1 through 406.7.1.4 where the piping system meets either of the following:

  1. The design operating gas pressure is greater than 2 psig (13.79 kPa).
  2. The piping being purged contains one or more sections of pipe or tubing meeting the size and length criteria of Table 406.7.1.1.

406.7.1.1 Removal from service. Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section 406.7.1.3. Where gas piping meeting the criteria of Table 406.7.1.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas.

TABLE 406.7.1.1
SIZE AND LENGTH OF PIPING
NOMINAL PIPE SIZE (inches)a LENGTH OF PIPING (feet)
≥2 ½ < 3 >50
≥ 3 < 4 > 30
≥ 4 < 6 > 15
≥ 6 < 8 > 10
≥ 8 Any length
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. CSST EHD size of 62 is equivalent to nominal 2-inch pipe or tubing size.

406.7.1.2 Placing in operation. Where gas piping containing air and meeting the criteria of Table 406.7.1.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section 406.7.1.3.

406.7.1.3 Outdoor discharge of purged gases. The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements:

  1. The point of discharge shall be controlled with a shutoff valve.
  2. The point of discharge shall be located at least 10 feet (3048 mm) from sources of ignition, at least 10 feet (3048 mm) from building openings and at least 25 feet (7620 mm) from mechanical air intake openings.
  3. During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that complies with Section 406.7.1.4.
  4. Purging operations introducing fuel gas shall be stopped when 90 percent fuel gas by volume is detected within the pipe.
  5. Persons not involved in the purging operations shall be evacuated from all areas within 10 feet (3048 mm) of the point of discharge.

406.7.1.4 Combustible gas indicator. Combustible gas indicators shall be listed and shall be calibrated in accordance with the manufacturer’s instructions. Combustible gas indicators shall numerically display a volume scale from zero percent to 100 percent in 1 percent or smaller increments.

406.7.2 Piping systems allowed to be purged indoors or outdoors. The purging of piping systems shall be in accordance with the provisions of Section 406.7.2.1 where the piping system meets both of the following:

  1. The design operating gas pressure is 2 psig (13.79 kPa) or less.
  2. The piping being purged is constructed entirely from pipe or tubing not meeting the size and length criteria of Table 406.7.1.1.

406.7.2.1 Purging procedure. The piping system shall be purged in accordance with one or more of the following:

  1. The piping shall be purged with fuel gas and shall discharge to the outdoors.
  2. The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through an appliance burner not located in a combustion chamber. Such burner shall be provided with a continuous source of ignition.
  3. The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through a burner that has a continuous source of ignition and that is designed for such purpose.
  4. The piping shall be purged with fuel gas that is discharged to the indoors or outdoors, and the point of discharge shall be monitored with a listed combustible gas detector in accordance with Section 406.7.2.2. Purging shall be stopped when fuel gas is detected.
  5. The piping shall be purged by the gas supplier in accordance with written procedures.

406.7.2.2 Combustible gas detector. Combustible gas detectors shall be listed and shall be calibrated or tested in accordance with the manufacturer’s instructions. Combustible gas detectors shall be capable of indicating the presence of fuel gas.

406.7.3 Purging appliances and equipment. After the piping system has been placed in operation, appliances and equipment shall be purged before being placed into operation.

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SECTION 407 (IFGC)
PIPING SUPPORT

407.1 General. Piping shall be provided with support in accordance with Section 407.2.

407.2 Design and installation. Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers or building structural components, suitable for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58 and shall be spaced in accordance with Section 415. Supports, hangers and anchors shall be installed so as not to interfere with the free expansion and contraction of the piping between anchors. All parts of the supporting equipment shall be designed and installed so they will not be disengaged by movement of the supported piping.

SECTION 408 (IFGC)
DRIPS AND SLOPED PIPING

408.1 Slopes. Piping for other than dry gas conditions shall be sloped not less than ¼ inch in 15 feet (6.3 mm in 4572 mm) to prevent traps.

408.2 Drips. Where wet gas exists, a drip shall be provided at any point in the line of pipe where condensate could collect. A drip shall also be provided at the outlet of the meter and shall be installed so as to constitute a trap wherein an accumulation of condensate will shut off the flow of gas before the condensate will run back into the meter.

408.3 Location of drips. Drips shall be provided with ready access to permit cleaning or emptying. A drip shall not be located where the condensate is subject to freezing.

408.4 Sediment trap. Where a sediment trap is not incorporated as part of the appliance, a sediment trap shall be installed downstream of the appliance shutoff valve as close to the inlet of the appliance as practical. The sediment trap shall be either a tee fitting having a capped nipple of any length installed vertically in the bottommost opening of the tee as illustrated in Figure 408.4 or other device approved as an effective sediment trap. Illuminating appliances, ranges, clothes dryers, decorative vented appliances for installation in vented fireplaces, gas fireplaces, and outdoor grills need not be so equipped.

FIGURE 408.4 Method of Installing a tee fitting sediment trap

FIGURE 408.4 Method of Installing a tee fitting sediment trap

SECTION 409 (IFGC)
SHUTOFF VALVES

409.1 General. Piping systems shall be provided with shutoff valves in accordance with this section.

409.1.1 Valve approval. Shutoff valves shall be of an approved type; shall be constructed of materials compatible with the piping; and shall comply with the standard that is applicable for the pressure and application, in accordance with Table 409.1.1.

409.1.2 Prohibited locations. Shutoff valves shall be prohibited in concealed locations and furnace plenums.

409.1.3 Access to shutoff valves. Shutoff valves shall be located in places so as to provide access for operation and shall be installed so as to be protected from damage.

TABLE 409.1.1
MANUAL GAS VALVE STANDARDS
VALVE STANDARDS APPLIANCE SHUTOFF VALVE APPLICATION UP TO ½psig PRESSURE OTHER VALVE APPLICATIONS
UP TO ½psig PRESSURE UP TO 2 psig PRESSURE UP TO 5 psig PRESSURE UP TO 125 psig PRESSURE
ANSI Z21.15 X
ASME B 16.44 X X Xa Xb
ASME B 16.33 X X X X X
For SI: 1 pound per square inch gauge = 6.895 kPa.
a. If labeled 2G.
b. If labeled 5G.
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409.2 Meter valve. Every meter shall be equipped with a shutoff valve located on the supply side of the meter.

409.3 Shutoff valves for multiple-house line systems. Where a single meter is used to supply gas to more than one building or tenant, a separate shutoff valve shall be provided for each building or tenant.

409.3.1 Multiple tenant buildings. In multiple tenant buildings, where a common piping system is installed to supply other than one- and two-family dwellings, shutoff valves shall be provided for each tenant. Each tenant shall have access to the shutoff valve serving that tenant’s space.

409.3.2 Individual buildings. In a common system serving more than one building, shutoff valves shall be installed outdoors at each building.

409.3.3 Identification of shutoff valves. Each house line shutoff valve shall be plainly marked with an identification tag attached by the installer so that the piping systems supplied by such valves are readily identified.

409.4 MP regulator valves. A listed shutoff valve shall be installed immediately ahead of each MP regulator.

409.5 Appliance shutoff valve. Each appliance shall be provided with a shutoff valve in accordance with Section 409.5.1, 409.5.2 or 409.5.3.

409.5.1 Located within same room. The shutoff valve shall be located in the same room as the appliance. The shutoff valve shall be within 6 feet (1829 mm) of the appliance, and shall be installed upstream of the union, connector or quick disconnect device it serves. Such shut-off valves shall be provided with access. Appliance shut-off valves located in the firebox of a fireplace shall be installed in accordance with the appliance manufacturer’s instructions.

409.5.2 Vented decorative appliances and room heaters. Shutoff valves for vented decorative appliances, room heaters and decorative appliances for installation in vented fireplaces shall be permitted to be installed in an area remote from the appliances where such valves are provided with ready access. Such valves shall be permanently identified and shall serve no other appliance. The piping from the shutoff valve to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections 401 through 408.

409.5.3 Located at manifold. Where the appliance shut-off valve is installed at a manifold, such shutoff valve shall be located within 50 feet (15 240 mm) of the appliance served and shall be readily accessible and permanently identified. The piping from the manifold to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections 401 through 408.

409.6 Shutoff valve for laboratories. Where provided with two or more fuel gas outlets, including table-, bench- and hood-mounted outlets, each laboratory space in educational, research, commercial and industrial occupancies shall be provided with a single dedicated shutoff valve through which all such gas outlets shall be supplied. The dedicated shutoff valve shall be readily accessible, located within the laboratory space served, located adjacent to the egress door from the space and shall be identified by approved signage stating “Gas Shutoff.”

SECTION 410 (IFGC)
FLOW CONTROLS

410.1 Pressure regulators. A line pressure regulator shall be installed where the appliance is designed to operate at a lower pressure than the supply pressure. Line gas pressure regulators shall be listed as complying with ANSI Z21.80. Access shall be provided to pressure regulators. Pressure regulators shall be protected from physical damage. Regulators installed on the exterior of the building shall be approved for outdoor installation.

410.2 MP regulators. MP pressure regulators shall comply with the following:

  1. The MP regulator shall be approved and shall be suitable for the inlet and outlet gas pressures for the application.
  2. The MP regulator shall maintain a reduced outlet pressure under lockup (no-flow) conditions.
  3. The capacity of the MP regulator, determined by published ratings of its manufacturer, shall be adequate to supply the appliances served.
  4. The MP pressure regulator shall be provided with access. Where located indoors, the regulator shall be vented to the outdoors or shall be equipped with a leak-limiting device, in either case complying with Section 410.3.
  5. A tee fitting with one opening capped or plugged shall be installed between the MP regulator and its upstream shutoff valve. Such tee fitting shall be positioned to allow connection of a pressure-measuring instrument and to serve as a sediment trap.
  6. A tee fitting with one opening capped or plugged shall be installed not less than 10 pipe diameters downstream of the MP regulator outlet. Such tee fitting shall be positioned to allow connection of a pressure-measuring instrument.

410.3 Venting of regulators. Pressure regulators that require a vent shall be vented directly to the outdoors. The vent shall be designed to prevent the entry of insects, water and foreign objects.

Exception: A vent to the outdoors is not required for regulators equipped with and labeled for utilization with an approved vent-limiting device installed in accordance with the manufacturer’s instructions.

410.3.1 Vent piping. Vent piping for relief vents and breather vents shall be constructed of materials allowed for gas piping in accordance with Section 403. Vent piping shall be not smaller than the vent connection on the pressure regulating device. Vent piping serving relief vents and combination relief and breather vents shall be run independently to the outdoors and shall serve only a single device vent. Vent piping serving only breather vents is permitted to be connected in a manifold arrangement

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where sized in accordance with an approved design that minimizes back-pressure in the event of diaphragm rupture. Regulator vent piping shall not exceed the length specified in the regulator manufacturer’s instructions.

410.4 Excess flow valves. Where automatic excess flow valves are installed, they shall be listed for the application and shall be sized and installed in accordance with the manufacturer’s instructions.

410.5 Flashback arrestor check valve. Where fuel gas is used with oxygen in any hot work operation, a listed protective device that serves as a combination flashback arrestor and backflow check valve shall be installed at an approved location on both the fuel gas and oxygen supply lines. Where the pressure of the piped fuel gas supply is insufficient to ensure such safe operation, approved equipment shall be installed between the gas meter and the appliance that increases pressure to the level required for such safe operation.

SECTION 411 (IFGC)
APPLIANCE AND MANUFACTURED HOME CONNECTIONS

411.1 Connecting appliances. Except as required by Section 411.1.1, appliances shall be connected to the piping system by one of the following:

  1. Rigid metallic pipe and fittings.
  2. Corrugated stainless steel tubing (CSST) where installed in accordance with the manufacturer’s instructions.
  3. Semirigid metallic tubing and metallic fittings. Lengths shall not exceed 6 feet (1829 mm) and shall be located entirely in the same room as the appliance. Semirigid metallic tubing shall not enter a motor-operated appliance through an unprotected knockout opening.
  4. Listed and labeled appliance connectors in compliance with ANSI Z21.24 and installed in accordance with the manufacturer’s instructions and located entirely in the same room as the appliance.
  5. Listed and labeled quick-disconnect devices used in conjunction with listed and labeled appliance connectors.
  6. Listed and labeled convenience outlets used in conjunction with listed and labeled appliance connectors.
  7. Listed and labeled outdoor appliance connectors in compliance with ANSI Z21.75/CSA 6.27 and installed in accordance with the manufacturer’s instructions.

411.1.1 Commercial cooking appliances. Commercial cooking appliances installed on casters and appliances that are moved for cleaning and sanitation purposes shall be connected to the piping system with an appliance connector listed as complying with ANSI Z21.69 or in accordance with Item 1 or 3 of Section 411.1.

411.1.2 Protection against damage. Connectors and tubing shall be installed so as to be protected against physical damage.

411.1.3 Connector installation. Appliance fuel connectors shall be installed in accordance with the manufacturer’s instructions and Sections 411.1.3.1 through 411.1.3.4.

411.1.3.1 Maximum length. Connectors shall have an overall length not to exceed 6 feet (1829 mm). Measurement shall be made along the centerline of the connector. Only one connector shall be used for each appliance.

Exception: Rigid metallic piping used to connect an appliance to the piping system shall be permitted to have a total length greater than 6 feet (1829 mm), provided that the connecting pipe is sized as part of the piping system in accordance with Section 402 and the location of the appliance shutoff valve complies with Section 409.5.

411.1.3.2 Minimum size. Connectors shall have the capacity for the total demand of the connected appliance.

411.1.3.3 Prohibited locations and penetrations. Connectors shall not be concealed within, or extended through, walls, floors, partitions, ceilings or appliance housings.

Exceptions:

  1. Connectors constructed of materials allowed for piping systems in accordance with Section 403 shall be permitted to pass through walls, floors, partitions and ceilings where installed in accordance with Section 409.5.2 or 409.5.3.
  2. Rigid steel pipe connectors shall be permitted to extend through openings in appliance housings.
  3. Fireplace inserts that are factory equipped with grommets, sleeves or other means of protection in accordance with the listing of the appliance.
  4. Semirigid tubing and listed connectors shall be permitted to extend through an opening in an appliance housing, cabinet or casing where the tubing or connector is protected against damage.

411.1.3.4 Shutoff valve. A shutoff valve not less than the nominal size of the connector shall be installed ahead of the connector in accordance with Section 409.5.

411.1.4 Movable appliances. Where appliances are equipped with casters or are otherwise subject to periodic movement or relocation for purposes such as routine cleaning and maintenance, such appliances shall be connected to the supply system piping by means of an approved flexible connector designed and labeled for the application. Such flexible connectors shall be installed and protected against physical damage in accordance with the manufacturer’s installation instructions.

411.1.5 (IFGS) Connection of gas engine-powered air conditioners. Internal combustion engines shall not be rigidly connected to the gas supply piping.

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411.1.6 Unions. A union fitting shall be provided for appliances connected by rigid metallic pipe. Such unions shall be accessible and located within 6 feet (1829 mm) of the appliance.

411.1.6 Unions. A union fitting shall be provided for appliances connected by rigid metallic pipe. Such unions shall be accessible and located within 6 feet (1829 mm) of the appliance.

411.2 Manufactured home connections. Manufactured homes shall be connected to the distribution piping system by one of the following materials:

  1. Metallic pipe in accordance with Section 403.4.
  2. Metallic tubing in accordance with Section 403.5.
  3. Listed and labeled connectors in compliance with ANSI Z21.75/CSA 6.27 and installed in accordance with the manufacturer’s installation instructions.

411.3 Suspended low-intensity infrared tube heaters. Suspended low-intensity infrared tube heaters shall be connected to the building piping system with a connector listed for the application complying with ANSI Z21.24/CGA 6.10. The connector shall be installed as specified by the tube heater manufacturer’s instructions.

SECTION 412 (IFGC)
LIQUEFIED PETROLEUM GAS MOTOR VEHICLE FUEL-DISPENSING FACILITIES

[F] 412.1 General. Motor fuel-dispensing facilities for LP-gas fuel shall be in accordance with this section and the International Fire Code. The operation of LP-gas motor fuel-dispensing facilities shall be regulated by the International Fire Code

[F] 412.2 Storage and dispensing. Storage vessels and equipment used for the storage or dispensing of LP-gas shall be approved or listed in accordance with Sections 412.3 and 412.4

[F] 412.3 Approved equipment. Containers: pressure-relief devices, including pressure-relief valves; and pressure regulators and piping used for LP-gas shall be approved.

[F] 412.4 Listed equipment. Hoses, hose connections, vehicle fuel connections, dispensers, LP-gas pumps and electrical equipment used for LP-gas shall be listed.

[F] 412.5 Attendants. Motor vehicle fueling operations shall be conducted by qualified attendants or in accordance with Section 412.8 by persons trained in the proper handling of LP-gas.

[F] 412.6 Location. In addition to the fuel dispensing requirements of the International Fire Code, the point of transfer for dispensing operations shall be 25 feet (7620 mm) or more from buildings having combustible exterior wall surfaces, buildings having noncombustible exterior wall surfaces that are not part of a 1-hour fire-resistance-rated assembly or buildings having combustible overhangs, property which could be built on public streets, or sidewalks and railroads; and at least 10 feet (3048 mm) from driveways and buildings having noncombustible exterior wall surfaces that are part of a fire-resistance-rated assembly having a rating of 1 hour or more.

Exception: The point of transfer for dispensing operations need not be separated from canopies providing weather protection for the dispensing equipment constructed in accordance with the International Building Code.

Liquefied petroleum gas containers shall be located in accordance with the International Fire Code. Liquefied petroleum gas storage and dispensing equipment shall be located outdoors and in accordance with the International Fire Code.

[F] 412.7 Installation of dispensing devices and equipment. The installation and operation of LP-gas dispensing systems shall be in accordance with this section and the International Fire Code. Liquefied petroleum gas dispensers and dispensing stations shall be installed in accordance with manufacturers’ specifications and their listing.

[F] 412.7.1 Valves. A manual shutoff valve and an excess flow-control check valve shall be located in the liquid line between the pump and the dispenser inlet where the dispensing device is installed at a remote location and is not part of a complete storage and dispensing unit mounted on a common base.

An excess flow-control check valve or an emergency shutoff valve shall be installed in or on the dispenser at the point at which the dispenser hose is connected to the liquid piping. A differential backpressure valve shall be considered equivalent protection. A listed shutoff valve shall be located at the discharge end of the transfer hose.

[F] 412.7.2 Hoses. Hoses and piping for the dispensing of LP-gas shall be provided with hydrostatic relief valves. The hose length shall not exceed 18 feet (5486 mm). An approved method shall be provided to protect the hose against mechanical damage.

[F] 412.7.3 Vehicle impact protection. Vehicle impact protection for LP-gas storage containers, pumps and dispensers shall be provided in accordance with the International Fire Code.

[F] 412.8 Private fueling of motor vehicles. Self-service LP-gas dispensing systems, including key, code and card lock dispensing systems, shall not be open to the public and shall be limited to the filling of permanently mounted fuel containers on LP-gas powered vehicles. In addition to the requirements in the International Fire Code, self-service LP-gas dispensing systems shall be provided with an emergency shutoff switch located within 100 feet (30 480 mm) of, but not less than 20 feet (6096 mm) from, dispensers and the owner of the dispensing facility shall ensure the safe operation of the system and the training of users.

SECTION 413 (IFGC)
COMPRESSED NATURAL GAS MOTOR VEHICLE FUEL-DISPENSING FACILITIES

[F] 413.1 General. Motor fuel-dispensing facilities for CNG fuel shall be in accordance with this section and the International Fire Code. The operation of CNG motor fuel-dispensing facilities shall be regulated by the International Fire Code.

[F] 413.2 General. Storage vessels and equipment used for the storage, compression or dispensing of CNG shall be

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approved or listed in accordance with Sections 413.2.1 through 413.2.3.

[F] 413.2.1 Approved equipment. Containers; compressors; pressure-relief devices, including pressure-relief valves; and pressure regulators and piping used for CNG shall be approved.

[F] 413.2.2 Listed equipment. Hoses, hose connections, dispensers, gas detection systems and electrical equipment used for CNG shall be listed. Vehicle fueling connections shall be listed and labeled.

[F] 413.2.3 General. Residential fueling appliances shall be listed. The capacity of a residential fueling appliance shall not exceed 5 standard cubic feet per minute (0.14 standard cubic meter/min) of natural gas.

[F] 413.3 Location of dispensing operations and equipment. Compression, storage and dispensing equipment shall be located above ground outside.

Exceptions:

  1. Compression, storage or dispensing equipment is allowed in buildings of noncombustible construction, as set forth in the International Building Code, which are unenclosed for three-quarters or more of the perimeter.
  2. Compression, storage and dispensing equipment is allowed to be located indoors or in vaults in accordance with the International Fire Code.
  3. Residential fueling appliances and equipment shall be allowed to be installed indoors in accordance with the equipment manufacturer’s instructions and Section 413.4.3.

[F] 413.3.1 Location on property. In addition to the fuel-dispensing requirements of the International Fire Code, compression, storage and dispensing equipment not located in vaults complying with the International Fire Code and other than residential fueling appliances shall not be installed:

  1. Beneath power lines.
  2. Less than 10 feet (3048 mm) from the nearest building or property that could be built on, public street, sidewalk or source of ignition.

    Exception: Dispensing equipment need not be separated from canopies that provide weather protection for the dispensing equipment and are constructed in accordance with the International Building Code.

  3. Less than 25 feet (7620 mm) from the nearest rail of any railroad track.
  4. Less than 50 feet (15 240 mm) from the nearest rail of any railroad main track or any railroad or transit line where power for train propulsion is provided by an outside electrical source, such as third rail or overhead catenary.
  5. Less than 50 feet (15 240 mm) from the vertical plane below the nearest overhead wire of a trolley bus line.

[F] 413.4 Residential fueling appliance installation. Residential fueling appliances shall be installed in accordance with Sections 413.4.1 through 413.4.3.

[F] 413.4.1 Gas connections. Residential fueling appliances shall be connected to the premises’ gas piping system without causing damage to the piping system or the connection to the internal appliance apparatus.

[F] 413.4.2 Outdoor installation. Residential fueling appliances located outdoors shall be installed on a firm, noncombustible base.

[F] 413.4.3 Indoor installation. Where located indoors, residential fueling appliances shall be vented to the outdoors. A gas detector set to operate at one-fifth of the lower limit of flammability of natural gas shall be installed in the room or space containing the appliance. The detector shall be located within 6 inches (152 mm) of the highest point in the room or space. The detector shall stop the operation of the appliance and activate an audible or a visual alarm.

[F] 413.5 Private fueling of motor vehicles. Self-service CNG-dispensing systems, including key, code and card lock dispensing systems, shall be limited to the filling of permanently mounted fuel containers on CNG-powered vehicles.

In addition to the requirements in the International Fire Code, the owner of a self-service CNG-dispensing facility shall ensure the safe operation of the system and the training of users.

[F] 413.6 Pressure regulators. Pressure regulators shall be designed, installed or protected so their operation will not be affected by the elements (freezing rain, sleet, snow, ice, mud or debris). This protection is allowed to be integral with the regulator.

[F] 413.7 Valves. Piping to equipment shall be provided with a remote manual shutoff valve. Such valve shall be provided with ready access.

[F] 413.8 Emergency shutdown control. An emergency shutdown device shall be located within 75 feet (22 860 mm) of, but not less than 25 feet (7620 mm) from, dispensers and shall also be provided in the compressor area. Upon activation, the emergency shutdown system shall automatically shut off the power supply to the compressor and close valves between the main gas supply and the compressor and between the storage containers and dispensers.

[F] 413.9 Discharge of CNG from motor vehicle fuel storage containers. The discharge of CNG from motor vehicle fuel cylinders for the purposes of maintenance, cylinder certification, calibration of dispensers or other activities shall be in accordance with this section. The discharge of CNG from motor vehicle fuel cylinders shall be accomplished through a closed transfer system or an approved method of atmospheric venting in accordance with Section 413.9.1 or 413.9.2.

[F] 413.9.1 Closed transfer system. A documented procedure which explains the logical sequence for discharging the cylinder shall be provided to the code official for review and approval. The procedure shall include what actions the operator will take in the event of a low-pressure or high-pressure natural gas release during the discharging

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activity. A drawing illustrating the arrangement of piping, regulators and equipment settings shall be provided to the code official for review and approval. The drawing shall illustrate the piping and regulator arrangement and shall be shown in spatial relation to the location of the compressor, storage vessels and emergency shutdown devices.

[F] 413.9.2 Atmospheric venting. Atmospheric venting of motor vehicle fuel cylinders shall be in accordance with Sections 413.9.2.1 through 413.9.2.6.

[F] 413.9.2.1 Plans and specifications. A drawing illustrating the location of the vessel support, piping, the method of grounding and bonding, and other requirements specified herein shall be provided to the code official for review and approval.

[F] 413.9.2.2 Cylinder stability. A method of rigidly supporting the vessel during the venting of CNG shall be provided. The selected method shall provide not less than two points of support and shall prevent the horizontal and lateral movement of the vessel. The system shall be designed to prevent the movement of the vessel based on the highest gas-release velocity through valve orifices at the vessel’s rated pressure and volume. The structure or appurtenance shall be constructed of noncombustible materials.

[F] 413.9.2.3 Separation. The structure or appurtenance used for stabilizing the cylinder shall be separated from the site equipment, features and exposures and shall be located in accordance with Table 413.9.2.3.

[F] TABLE 413.9.2.3
SEPARATION DISTANCE FOR ATMOSPHERIC VENTING OF CNG
EQUIPMENT OR FEATURE MINIMUM SEPARATION (feet)
Buildings 25
Building openings 25
Lot lines 15
Public ways 15
Vehicles 25
CNG compressor and storage vessels 25
CNG dispensers 25
For SI: 1 foot = 304.8 mm.

[F] 413.9.2.4 Grounding and bonding. The structure or appurtenance used for supporting the cylinder shall be grounded in accordance with NFPA 70. The cylinder valve shall be bonded prior to the commencement of venting operations.

[F] 413.9.2.5 Vent tube. A vent tube that will divert the gas flow to the atmosphere shall be installed on the cylinder prior to the commencement of the venting and purging operation. The vent tube shall be constructed of pipe or tubing materials approved for use with CNG in accordance with the International Fire Code.

The vent tube shall be capable of dispersing the gas a minimum of 10 feet (3048 mm) above grade level. The vent tube shall not be provided with a rain cap or other feature which would limit or obstruct the gas flow.

At the connection fitting of the vent tube and the CNG cylinder, a listed bidirectional detonation flame arrester shall be provided.

[F] 413.9.2.6 Signage. Approved NO SMOKING signs shall be posted within 10 feet (3048 mm) of the cylinder support structure or appurtenance. Approved CYLINDER SHALL BE BONDED signs shall be posted on the cylinder support structure or appurtenance.

SECTION 414 (IFGC)
SUPPLEMENTAL AND STANDBY GAS SUPPLY

414.1 Use of air or oxygen under pressure. Where air or oxygen under pressure is used in connection with the gas supply, effective means such as a backpressure regulator and relief valve shall be provided to prevent air or oxygen from passing back into the gas piping. Where oxygen is used, installation shall be in accordance with NFPA 51.

414.2 Interconnections for standby fuels. Where supplementary gas for standby use is connected downstream from a meter or a service regulator where a meter is not provided, a device to prevent backflow shall be installed. A three-way valve installed to admit the standby supply and at the same time shut off the regular supply shall be permitted to be used for this purpose.

SECTION 415 (IFGS)
PIPING SUPPORT INTERVALS

415.1 Interval of support. Piping shall be supported at intervals not exceeding the spacing specified in Table 415.1. Spacing of supports for CSST shall be in accordance with the CSST manufacturer’s instructions.

TABLE 415.1
SUPPORT OF PIPING
STEEL PIPE, NOMINAL SIZE OF PIPE (inches) SPACING OF SUPPORTS (feet) NOMINAL SIZE OF TUBING (SMOOTH-WALL) (inch O.D.) SPACING OF SUPPORTS (feet)
½ 6 ½ 4
¾ or 1 8 5/8 or ¾ 6
1 ¼ or larger (horizontal) 10 7/8 or 1 (horizontal) 8
1 ¼ or larger (vertical) Every floor level 1 or larger (vertical) Every floor level
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

SECTION 416 (IFGS)
OVERPRESSURE PROTECTION DEVICES

416.1 General. Overpressure protection devices shall be provided in accordance with this section to prevent the pressure in the piping system from exceeding the pressure that would cause unsafe operation of any connected and properly adjusted appliances.

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416.2 Protection methods. The requirements of this section shall be considered to be met and a piping system deemed to have overpressure protection where a service or line pressure regulator plus one other device are installed such that the following occur:

  1. Each device limits the pressure to a value that does not exceed the maximum working pressure of the downstream system.
  2. The individual failure of either device does not result in the overpressurization of the downstream system.

416.3 Device maintenance. The pressure regulating, limiting and relieving devices shall be maintained; and inspection procedures shall be devised or instrumentation installed to detect failures or malfunctions of such devices; and replacements or repairs shall be made.

416.4 Where required. A pressure-relieving or pressure-limiting device shall not be required where: (1) the gas does not contain materials that could seriously interfere with the operation of the service or line pressure regulator; (2) the operating pressure of the gas source is 60 psi (414 kPa) or less; and (3) the service or line pressure regulator has all of the following design features or characteristics:

  1. Pipe connections to the service or line regulator do not exceed 2 inches (51 mm) nominal diameter.
  2. The regulator is self-contained with no external static or control piping.
  3. The regulator has a single port valve with an orifice diameter not greater than that recommended by the manufacturer for the maximum gas pressure at the regulator inlet.
  4. The valve seat is made of resilient material designed to withstand abrasion of the gas, impurities in the gas and cutting by the valve, and to resist permanent deformation where it is pressed against the valve port.
  5. The regulator is capable, under normal operating conditions, of regulating the downstream pressure within the necessary limits of accuracy and of limiting the discharge pressure under no-flow conditions to not more than 150 percent of the discharge pressure maintained under flow conditions.

416.5 Devices. Pressure-relieving or pressure-limiting devices shall be one of the following:

  1. Spring-loaded relief device.
  2. Pilot-loaded back pressure regulator used as a relief valve and designed so that failure of the pilot system or external control piping will cause the regulator relief valve to open.
  3. A monitoring regulator installed in series with the service or line pressure regulator.
  4. A series regulator installed upstream from the service or line regulator and set to continuously limit the pressure on the inlet of the service or line regulator to the maximum working pressure of the downstream piping system.
  5. An automatic shutoff device installed in series with the service or line pressure regulator and set to shut off when the pressure on the downstream piping system reaches the maximum working pressure or some other predetermined pressure less than the maximum working pressure. This device shall be designed so that it will remain closed until manually reset.
  6. A liquid seal relief device that can be set to open accurately and consistently at the desired pressure.

The devices shall be installed either as an integral part of the service or line pressure regulator or as separate units. Where separate pressure-relieving or pressure-limiting devices are installed, they shall comply with Sections 416.5.1 through 416.5.6.

416.5.1 Construction and installation. Pressure relieving and pressure-limiting devices shall be constructed of materials so that the operation of the devices will not be impaired by corrosion of external parts by the atmosphere or of internal parts by the gas. Pressure-relieving and pressure-limiting devices shall be designed and installed so that they can be operated to determine whether the valve is free. The devices shall also be designed and installed so that they can be tested to determine the pressure at which they will operate and examined for leakage when in the closed position.

416.5.2 External control piping. External control piping shall be protected from falling objects, excavations and other causes of damage and shall be designed and installed so that damage to any control piping will not render both the regulator and the overpressure protective device inoperative.

416.5.3 Setting. Each pressure-relieving or pressure-limiting device shall be set so that the pressure does not exceed a safe level beyond the maximum allowable working pressure for the connected piping and appliances.

416.5.4 Unauthorized operation. Where unauthorized operation of any shutoff valve can make a pressure relieving valve or pressure limiting device inoperative, one of I the following shall apply:

  1. The valve shall be locked in the open position. Authorized personnel shall be instructed in the importance of leaving the shutoff valve open and of being present while the shutoff valve is closed so that it can be locked in the open position before leaving the premises.
  2. Duplicate relief valves shall be installed, each having adequate capacity to protect the system, and the isolating valves and three-way valves shall be arranged so that only one safety device can be rendered inoperative at a time.

416.5.5 Vents. The discharge stacks, vents and outlet parts of all pressure-relieving and pressure-limiting devices shall be located so that gas is safely discharged to the outdoors. Discharge stacks and vents shall be designed to prevent the entry of water, insects and other foreign material

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that could cause blockage. The discharge stack or vent line shall be at least the same size as the outlet of the pressure-relieving device.

416.5.6 Size of fittings, pipe and openings. The fittings, pipe and openings located between the system to be protected and the pressure-relieving device shall be sized to prevent hammering of the valve and to prevent impairment of relief capacity.

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CHAPTER 5
CHIMNEYS AND VENTS

SECTION 501 (IFGC)
GENERAL

501.1 Scope. This chapter shall govern the installation, maintenance, repair and approval of factory-built chimneys, chimney liners, vents and connectors and the utilization of masonry chimneys serving gas-fired appliances. The requirements for the installation, maintenance, repair and approval of factory-built chimneys, chimney liners, vents and connectors serving appliances burning fuels other than fuel gas shall be regulated by the International Mechanical Code. The construction, repair, maintenance and approval of masonry chimneys shall be regulated by the International Building Code.

501.2 General. Every appliance shall discharge the products of combustion to the outdoors, except for appliances exempted by Section 501.8.

501.3 Masonry chimneys. Masonry chimneys shall be constructed in accordance with Section 503.5.3 and the International Building Code.

501.4 Minimum size of chimney or vent. Chimneys and vents shall be sized in accordance with Sections 503 and 504.

501.5 Abandoned inlet openings. Abandoned inlet openings in chimneys and vents shall be closed by an approved method.

501.6 Positive pressure. Where an appliance equipped with a mechanical forced draft system creates a positive pressure in the venting system, the venting system shall be designed for positive pressure applications.

501.7 Connection to fireplace. Connection of appliances to chimney flues serving fireplaces shall be in accordance with Sections 501.7.1 through 501.7.3.

501.7.1 Closure and access. A noncombustible seal shall be provided below the point of connection to prevent entry of room air into the flue. Means shall be provided for access to the flue for inspection and cleaning.

501.7.2 Connection to factory-built fireplace flue. An appliance shall not be connected to a flue serving a factory-built fireplace unless the appliance is specifically listed for such installation. The connection shall be made in accordance with the appliance manufacturer’s installation instructions.

501.7.3 Connection to masonry fireplace flue. A connector shall extend from the appliance to the flue serving a masonry fireplace such that the flue gases are exhausted directly into the flue. The connector shall be accessible or removable for inspection and cleaning of both the connector and the flue. Listed direct connection devices shall be installed in accordance with their listing.

501.8 Appliances not required to be vented. The following appliances shall not be required to be vented.

  1. Ranges.
  2. Built-in domestic cooking units listed and marked for optional venting.
  3. Hot plates and laundry stoves.
  4. Type 1 clothes dryers (Type 1 clothes dryers shall be exhausted in accordance with the requirements of Section 614).
  5. A single booster-type automatic instantaneous water heater, where designed and used solely for the sanitizing rinse requirements of a dishwashing machine, provided that the heater is installed in a commercial kitchen having a mechanical exhaust system. Where installed in this manner, the draft hood, if required, shall be in place and unaltered and the draft hood outlet shall be not less than 36 inches (914 mm) vertically and 6 inches (152 mm) horizontally from any surface other than the heater.
  6. Refrigerators.
  7. Counter appliances.
  8. Room heaters listed for unvented use.
  9. Direct-fired makeup air heaters.
  10. Other appliances listed for unvented use and not provided with flue collars.
  11. Specialized appliances of limited input such as laboratory burners and gas lights.

Where the appliances listed in Items 5 through 11 above are installed so that the aggregate input rating exceeds 20 British thermal units (Btu) per hour per cubic feet (207 watts per m3) of volume of the room or space in which such appliances are installed, one or more shall be provided with venting systems or otherapproved means for conveying the vent gases to the outdoor atmosphere so that the aggregate input rating of the remaining unvented appliances does not exceed 20 Btu per hour per cubic foot (207 watts per m3). Where the room or space in which the appliance is installed is directly connected to another room or space by a doorway, archway or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.

501.9 Chimney entrance. Connectors shall connect to a masonry chimney flue at a point not less than 12 inches (305 mm) above the lowest portion of the interior of the chimney flue.

501.10 Connections to exhauster. Appliance connections to a chimney or vent equipped with a power exhauster shall be made on the inlet side of the exhauster. Joints on the positive pressure side of the exhauster shall be sealed to prevent flue-gas leakage as specified by the manufacturer’s installation instructions for the exhauster.

501.11 Masonry chimneys. Masonry chimneys utilized to vent appliances shall be located, constructed and sized as

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specified in the manufacturer’s installation instructions for the appliances being vented and Section 503.

501.12 Residential and low-heat appliances flue lining systems. Flue lining systems for use with residential-type and low-heat appliances shall be limited to the following:

  1. Clay flue lining complying with the requirements of ASTM C 315 or equivalent. Clay flue lining shall be installed in accordance with the International Building Code.
  2. Listed chimney lining systems complying with UL 1777.
  3. Other approved materials that will resist, without cracking, softening or corrosion, flue gases and condensate at temperatures up to 1,800°F (982°C).

501.13 Category 1 appliance flue lining systems. Flue lining systems for use with Category I appliances shall be limited to the following:

  1. Flue lining systems complying with Section 501.12.
  2. Chimney lining systems listed and labeled for use with gas appliances with draft hoods and other Category I gas appliances listed and labeled for use with Type B vents.

501.14 Category II, III and IV appliance venting systems. The design, sizing and installation of vents for Category II, III and IV appliances shall be in accordance with the appliance manufacturer’s installation instructions.

501.15 Existing chimneys and vents. Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections 501.15.1 through 501.15.4.

501.15.1 Size. The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For Category I appliances, the resizing shall be in accordance with Section 502.

501.15.2 Flue passageways. The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote.

501.15.3 Cleanout. Masonry chimney flues shall be provided with a cleanout opening having a minimum height of 6 inches (152 mm). The upper edge of the opening shall be located not less than 6 inches (152 mm) below the lowest chimney inlet opening. The cleanout shall be provided with a tight-fitting, noncombustible cover.

501.15.4 Clearances. Chimneys and vents shall have airspace clearance to combustibles in accordance with the International Building Code and the chimney or vent manufacturer’s installation instructions.

Exception: Masonry chimneys without the required airspace clearances shall be permitted to be used if lined or relined with a chimney lining system listed for use in chimneys with reduced clearances in accordance with UL 1777. The chimney clearance shall be not less than permitted by the terms of the chimney liner listing and the manufacturer’s instructions.

501.15.4.1 Fireblocking. Noncombustible fireblocking shall be provided in accordance with the International Building Code.

SECTION 502 (IFGC)
VENTS

502.1 General. All vents, except as provided in Section 503.7, shall be listed and labeled. Type B and BW vents shall be tested in accordance with UL 441. Type L vents shall be tested in accordance with UL 641. Vents for Category II and III appliances shall be tested in accordance with UL 1738. Plastic vents for Category IV appliances shall not be required to be listed and labeled where such vents are as specified by the appliance manufacturer and are installed in accordance with the appliance manufacturer’s installation instructions.

502.2 Connectors required. Connectors shall be used to connect appliances to the vertical chimney or vent, except where the chimney or vent is attached directly to the appliance. Vent connector size, material, construction and installation shall be in accordance with Section 503.

502.3 Vent application. The application of vents shall be in accordance with Table 503.4.

502.4 Insulation shield. Where vents pass through insulated assemblies, an insulation shield constructed of steel having a minimum thickness of 0.0187 inch (0.4712 mm) (No. 26 gage) shall be installed to provide clearance between the vent and the insulation material. The clearance shall not be less than the clearance to combustibles specified by the vent manufacturer’s installation instructions. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed vent system shall be installed in accordance with the manufacturer’s installation instructions.

502.5 Installation. Vent systems shall be sized, installed and terminated in accordance with the vent and appliance manufacturer’s installation instructions and Section 503.

502.6 Support of vents. All portions of vents shall be adequately supported for the design and weight of the materials employed.

502.7 Protection against physical damage. In concealed locations, where a vent is installed through holes or notches in studs, joists, rafters or similar members less than 1½ inches (38 mm) from the nearest edge of the member, the vent shall be protected by shield plates. Protective steel shield plates having a minimum thickness of 0.0575 inch (1.463 mm)

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(No. 16 gage) shall cover the area of the vent where the member is notched or bored and shall extend a minimum of 4 inches (102 mm) above sole plates, below top plates and to each side of a stud, joist or rafter.

SECTION 503 (IFGS)
VENTING OF APPLIANCES

503.1 General. The venting of appliances shall be in accordance with Sections 503.2 through 503.16.

503.2 Venting systems required. Except as permitted in Sections 503.2.1 through 503.2.4 and 501.8, all appliances shall be connected to venting systems.

503.2.1 Ventilating hoods. Ventilating hoods and exhaust systems shall be permitted to be used to vent appliances installed in commercial applications and to vent industrial appliances, such as where the process itself requires fume disposal.

503.2.2 Well-ventilated spaces. Where located in a large and well-ventilated space, industrial appliances shall be permitted to be operated by discharging the flue gases directly into the space.

503.2.3 Direct-vent appliances. Listed direct-vent appliances shall be installed in accordance with the manufacturer’s instructions and Section 503.8, Item 3.

503.2.4 Appliances with integral vents. Appliances incorporating integral venting means shall be installed in accordance with the manufacturer’s instructions and Section 503.8, Items 1 and 2.

503.2.5 Incinerators. Commercial-industrial-type incinerators shall be vented in accordance with NFPA 82.

503.3 Design and construction. Venting systems shall be designed and constructed so as to convey all flue and vent gases to the outdoors.

503.3.1 Appliance draft requirements. A venting system shall satisfy the draft requirements of the appliance in accordance with the manufacturer’s instructions.

503.3.2 Design and construction. Appliances required to be vented shall be connected to a venting system designed and installed in accordance with the provisions of Sections 503.4 through 503.16.

503.3.3 Mechanical draft systems. Mechanical draft systems shall comply with the following:

  1. Mechanical draft systems shall be listed and shall be installed in accordance with the manufacturer’s installation instructions for both the appliance and the mechanical draft system.
  2. Appliances requiring venting shall be permitted to be vented by means of mechanical draft systems of either forced or induced draft design.
  3. Forced draft systems and all portions of induced draft systems under positive pressure during operation shall be designed and installed so as to prevent leakage of flue or vent gases into a building.
  4. Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.
  5. Where a mechanical draft system is employed, provisions shall be made to prevent the flow of gas to the main burners when the draft system is not performing so as to satisfy the operating requirements of the appliance for safe performance.
  6. The exit terminals of mechanical draft systems shall be not less than 7 feet (2134 mm) above finished ground level where located adjacent to public walkways and shall be located as specified in Section 503.8, Items 1 and 2.

503.3.4 Ventilating hoods and exhaust systems. Ventilating hoods and exhaust systems shall be permitted to be used to vent appliances installed in commercial applications. Where automatically operated appliances, other than commercial cooking appliances, are vented through a ventilating hood or exhaust system equipped with a damper or with a power means of exhaust, provisions shall be made to allow the flow of gas to the main burners only when the damper is open to a position to properly vent the appliance and when the power means of exhaust is in operation.

503.3.5 Air ducts and furnace plenums. Venting systems shall not extend into or pass through any fabricated air duct or furnace plenum.

503.3 .6 Above-ceiling air-handling spaces. Where a venting system passes through an above-ceiling air-handling space or other nonducted portion of an air-handling system, the venting system shall conform to one of the following requirements:

  1. The venting system shall be a listed special gas vent; other venting system serving a Category III or Category IV appliance; or other positive pressure vent, with joints sealed in accordance with the appliance or vent manufacturer’s instructions.
  2. The venting system shall be installed such that fittings and joints between sections are not installed in the above-ceiling space.
  3. The venting system shall be installed in a conduit or enclosure with sealed joints separating the interior of the conduit or enclosure from the ceiling space.

503.4 Type of venting system to be used. The type of venting system to be used shall be in accordance with Table 503.4.

503.4.1 Plastic piping. Plastic piping used for venting appliances listed for use with such venting materials shall be approved.

503.4.1.1 Plastic vent joints. Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer’s installation instructions. Where a primer is required, it shall be of a contrasting color.

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TABLE 503.4
TYPE OF VENTING SYSTEM TO BE USED
APPLIANCES TYPE OF VENTING SYSTEM
Listed Category I appliances
Listed appliances equipped with draft hood
Appliances listed for use with Type B gas vent
Type B gas vent (Section 503.6)
Chimney (Section 503.5)
Single-wall metal pipe (Section 503.7)
Listed chimney lining system for gas venting (Section 503.5.3)
Special gas vent listed for these appliances (Section 503.4.2)
Listed vented wall furnaces Type B-W gas vent (Sections 503.6, 608)
Category II appliances As specified or furnished by manufacturers of listed appliances (Sections 503.4.1, 503.4.2)
Category III appliances As specified or furnished by manufacturers of listed appliances (Sections 503.4.1,503.4.2)
Category IV appliances As specified or furnished by manufacturers of listed appliances (Sections 503.4.1, 503.4.2)
Incinerators In accordance with NFPA 82
Appliances that can be converted for use with solid fuel Chimney (Section 503.5)
Unlisted combination gas and oil-burning appliances Chimney (Section 503.5)
Listed combination gas and oil-burning appliances Type L vent (Section 503.6) or chimney (Section 503.5)
Combination gas and solid fuel-burning appliances Chimney (Section 503.5)
Appliances listed for use with chimneys only Chimney (Section 503.5)
Unlisted appliances Chimney (Section 503.5)
Decorative appliances in vented fireplaces Chimney
Gas-fired toilets Single-wall metal pipe (Section 626)
Direct-vent appliances See Section 503.2.3
Appliances with integral vent See Section 503.2.4

503.4.2 Special gas vent. Special gas vent shall be listed and installed in accordance with the special gas vent manufacturer’s installation instructions.

503.5 Masonry, metal and factory-built chimneys. Masonry, metal and factory-built chimneys shall comply with Sections 503.5.1 through 503.5.10.

503.5.1 Factory-built chimneys. Factory-built chimneys shall be installed in accordance with the manufacturer’s installation instructions. Factory-built chimneys used to vent appliances that operate at a positive vent pressure shall be listed for such application.

503.5.2 Metal chimneys. Metal chimneys shall be built and installed in accordance with NFPA 211.

503.5.3 Masonry chimneys. Masonry chimneys shall be built and installed in accordance with NFPA 211 and shall be lined with approved clay flue lining, a listed chimney lining system or other approved material that will resist corrosion, erosion, softening or cracking from vent gases at temperatures up to 1,800°F (982°C).

Exception: Masonry chimney flues serving listed gas appliances with draft hoods, Category I appliances and other gas appliances listed for use with Type B vents shall be permitted to be lined with a chimney lining system specifically listed for use only with such appliances. The liner shall be installed in accordance with the liner manufacturer’s installation instructions. A permanent identifying label shall be attached at the point where the connection is to be made to the liner. The label shall read: “This chimney liner is for appliances that burn gas only. Do not connect to solid or liquid fuel-burning appliances or incinerators.”

For installation of gas vents in existing masonry chimneys, see Section 503.6.3.

503.5.4 Chimney termination. Chimneys for residential-type or low-heat appliances shall extend at least 3 feet (914 mm) above the highest point where they pass through a roof of a building and at least 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm). Chimneys for medium-heat appliances shall extend at least 10 feet (3048 mm) higher than any portion of any building within 25 feet (7620 mm). Chimneys shall extend at least 5 feet (1524 mm) above the highest connected appliance draft hood outlet or flue collar. Decorative shrouds shall not be installed at the termination of factory-built chimneys except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the manufacturer’s installation instructions.

503.5.5 Size of chimneys. The effective area of a chimney venting system serving listed appliances with draft hoods, Category I appliances and other appliances listed for use with Type B vents shall be determined in accordance with one of the following methods:

  1. The provisions of Section 504. 86
  2. For sizing an individual chimney venting system for a single appliance with a draft hood, the effective areas of the vent connector and chimney flue shall be not less than the area of the appliance flue collar or draft hood outlet, nor greater than seven times the draft hood outlet area.
  3. For sizing a chimney venting system connected to two appliances with draft hoods, the effective area of the chimney flue shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than seven times the smallest draft hood outlet area.
  4. Chimney venting systems using mechanical draft shall be sized in accordance with approved engineering methods.
  5. Other approved engineering methods.

503.5.6 Inspection of chimneys. Before replacing an existing appliance or connecting a vent connector to a chimney, the chimney passageway shall be examined to ascertain that it is clear and free of obstructions and it shall be cleaned if previously used for venting solid or liquid fuel-burning appliances or fireplaces.

503.5.6.1 Chimney lining. Chimneys shall be lined in accordance with NFPA 211.

Exception: Where an existing chimney complies with Sections 503.5.6 through 503.5.6.3 and its sizing is in accordance with Section 503.5.5, its continued use shall be allowed where the appliance vented by such chimney is replaced by an appliance of similar type, input rating and efficiency.

503.5.6.2 Cleanouts. Cleanouts shall be examined to determine if they will remain tightly closed when not in use.

503.5.6.3 Unsafe chimneys. Where inspection reveals that an existing chimney is not safe for the intended application, it shall be repaired, rebuilt, lined, relined or replaced with a vent or chimney to conform to NFPA 211 and it shall be suitable for the appliances to be vented.

503.5.7 Chimneys serving appliances burning other fuels. Chimneys serving appliances burning other fuels shall comply with Sections 503.5.7.1 through 503.5.7.4.

503.5.7.1 Solid fuel-burning appliances. An appliance shall not be connected to a chimney flue serving a separate appliance designed to burn solid fuel.

503.5.7.2 Liquid fuel-burning appliances. Where one chimney flue serves gas appliances and liquid fuel-burning appliances, the appliances shall be connected through separate openings or shall be connected through a single opening where joined by a suitable fitting located as close as practical to the chimney. Where two or more openings are provided into one chimney flue, they shall be at different levels. Where the appliances are automatically controlled, they shall be equipped with safety shutoff devices.

503.5.7.3 Combination gas and solid fuel-burning appliances. A combination gas- and solid fuel-burning appliance shall be permitted to be connected to a single chimney flue where equipped with a manual reset device to shut off gas to the main burner in the event of sustained backdraft or flue gas spillage. The chimney flue shall be sized to properly vent the appliance.

503.5.7.4 Combination gas- and oil fuel-burning appliances. A listed combination gas- and oil fuel-burning appliance shall be permitted to be connected to a single chimney flue. The chimney flue shall be sized to properly vent the appliance.

503.5.8 Support of chimneys. All portions of chimneys shall be supported for the design and weight of the materials employed. Factory-built chimneys shall be supported and spaced in accordance with the manufacturer’s installation instructions.

503.5.9 Cleanouts. Where a chimney that formerly carried flue products from liquid or solid fuel-burning appliances is used with an appliance using fuel gas, an accessible cleanout shall be provided. The cleanout shall have a tight-fitting cover and shall be installed so its upper edge is at least 6 inches (152 mm) below the lower edge of the lowest chimney inlet opening.

503.5.10 Space surrounding lining or vent. The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry chimney flue shall not be used to vent another appliance. The insertion of another liner or vent within the chimney as provided in this code and the liner or vent manufacturer’s instructions shall not be prohibited.

The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air. Such space shall not be prohibited from supplying combustion air to direct-vent appliances designed for installation in a solid fuel-burning fireplace and installed in accordance with the manufacturer’s installation instructions.

503.6 Gas vents. Gas vents shall comply with Sections 503.6.1 through 503.6.13 (see Section 202, Definitions).

503.6.1 Installation, general. Gas vents shall be installed in accordance with the manufacturer’s installation instructions.

503.6.2 Type B-W vent capacity. A Type B-W gas vent shall have a listed capacity not less than that of the listed vented wall furnace to which it is connected.

503.6.3 Gas vents installed within masonry chimneys. Gas vents installed within masonry chimneys shall be installed in accordance with the manufacturer’s installation instructions. Gas vents installed within masonry chimneys shall be identified with a permanent label installed at the point where the vent enters the chimney. The label shall contain the following language: “This gas vent is for appliances that burn gas. Do not connect to solid or liquid fuel-burning appliances or incinerators.”

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503.6.4 Gas vent terminations. A. gas vent shall terminate in accordance with one of the following:

  1. Gas vents that are 12 inches (305 mm) or less in size and located not less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate above the roof in accordance with Figure 503.6.4.
  2. Gas vents that are over 12 inches (305 mm) in size or are located less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate not less than 2 feet (610 mm) above the highest point where they pass through the roof and not less than 2 feet (610 mm) above any portion of a building within 10 feet (3048 mm) horizontally.
  3. As provided for industrial appliances in Section 503.2.2.
  4. As provided for direct-vent systems in Section 503.2.3.
  5. As provided for appliances with integral vents in Section 503.2.4.
  6. As provided for mechanical draft systems in Section 503.3.3.
  7. As provided for ventilating hoods and exhaust systems in Section 503.3.4.

FIGURE 503.6.4 TERMINATION LOCATIONS FOR GAS VENTS WITH LISTED CAPS 12 INCHES OR LESS IN SIZE AT LEAST 8 FEET FROM A VERTICAL WALL

FIGURE 503.6.4
TERMINATION LOCATIONS FOR GAS VENTS WITH LISTED CAPS 12 INCHES OR LESS IN SIZE AT LEAST 8 FEET FROM A VERTICAL WALL

503.6.4.1 Decorative shrouds. Decorative shrouds shall not be installed at the termination of gas vents except where such shrouds are listed for use with the specific gas venting system and are installed in accordance with manufacturer’s installation instructions.

503.6.5 Minimum height. A Type B or L gas vent shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar. A Type B-W gas vent shall terminate at least 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.

503.6.6 Roof terminations. Gas vents shall extend through the roof flashing, roof jack or roof thimble and terminate with a listed cap or listed roof assembly.

503.6.7 Forced air inlets. Gas vents shall terminate not less than 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm).

503.6.8 Exterior wall penetrations. A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Sections 503.2.3 and 503.3.3.

503.6.9 Size of gas vents. Venting systems shall be sized and constructed in accordance with Section 504 or other approved engineering methods and the gas vent and appliance manufacturer’s installation instructions.

503.6.9.1 Category I appliances. The sizing of natural draft venting systems serving one or more listed appliances equipped with a draft hood or appliances listed for use with Type B gas vent, installed in a single story of a building, shall be in accordance with one of the following methods:

  1. The provisions of Section 504.
  2. For sizing an individual gas vent for a single, draft-hood-equipped appliance, the effective area of the vent connector and the gas vent shall be not less than the area of the appliance draft hood outlet, nor greater than seven times the draft hood outlet area.
  3. For sizing a gas vent connected to two appliances with draft hoods, the effective area of the vent shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than seven times the smaller draft hood outlet area.
  4. Approved engineering practices.

503.6.9.2 Vent offsets. Type B and L vents sized in accordance with Item 2 or 3 of Section 503.6.9.1 shall

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extend in a generally vertical direction with offsets not exceeding 45 degrees (0.79 rad), except that a vent system having not more than one 60-degree (1.04 rad) offset shall be permitted. Any angle greater than 45 degrees (0.79 rad) from the vertical is considered horizontal. The total horizontal distance of a vent plus the horizontal vent connector serving draft hood-equipped appliances shall be not greater than 75 percent of the vertical height of the vent.

503.6.9.3 Category II, III and IV appliances. The sizing of gas vents for Category II, III and IV appliances shall be in accordance with the appliance manufacturer’s instructions.

503.6.9.4 Mechanical draft. Chimney venting systems using mechanical draft shall be sized in accordance with approved engineering methods.

503.6.10 Gas vents serving appliances on more than one floor. A common vent shall be permitted in multistory installations to vent Category I appliances located on more than one floor level, provided that the venting system is designed and installed in accordance with approved engineering methods. For the purpose of this section, crawl spaces, basements and attics shall be considered as floor levels.

503.6.10.1 Appliance separation. All appliances connected to the common vent shall be located in rooms separated from occupiable space. Each of these rooms shall have provisions for an adequate supply of combustion, ventilation and dilution air that is not supplied from an occupiable space.

503.6.10.2 Sizing. The size of the connectors and common segments of multistory venting systems for appliances listed for use with Type B double-wall gas vents shall be in accordance with Table 504.3(1), provided that:

  1. The available total height (H) for each segment of a multistory venting system is the vertical distance between the level of the highest draft hood outlet or flue collar on that floor and the center-line of the next highest interconnection tee.
  2. The size of the connector for a segment is determined from the appliance input rating and available connector rise, and shall not be smaller than the draft hood outlet or flue collar size.
  3. The size of the common vertical segment, and of the interconnection tee at the base of that segment, shall be based on the total appliance input rating entering that segment and its available total height.

503.6.11 Support of gas vents. Gas vents shall be supported and spaced in accordance with the manufacturer’s installation instructions.

503.6.12 Marking. In those localities where solid and liquid fuels are used extensively, gas vents shall be permanently identified by a label attached to the wall or ceiling at a point where the vent connector enters the gas vent.

The determination of where such localities exist shall be made by the code official. The label shall read:

“This gas vent is for appliances that burn gas. Do not connect to solid or liquid fuel-burning appliances or incinerators.”

503.6.13 Fastener penetrations. Screws, rivets and other fasteners shall not penetrate the inner wall of double-wall gas vents, except at the transition from an appliance draft hood outlet, a flue collar or a single-wall metal connector to a double-wall vent.

503.7 Single-wall metal pipe. Single-wall metal pipe vents shall comply with Sections 503.7.1 through 503.7.13.

503.7.1 Construction. Single-wall metal pipe shall be constructed of galvanized sheet steel not less than 0.0304 inch (0.7 mm) thick, or other approved, noncombustible, corrosion-resistant material.

503.7.2 Cold climate. Uninsulated single-wall metal pipe shall not be used outdoors for venting appliances in regions where the 99-percent winter design temperature is below 32°F (0°C).

503.7.3 Termination. Single-wall metal pipe shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood outlet or flue collar. Single-wall metal pipe shall extend at least 2 feet (610 mm) above the highest point where it passes through a roof of a building and at least 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm). An approved cap or roof assembly shall be attached to the terminus of a single-wall metal pipe.

503.7.4 Limitations of use. Single-wall metal pipe shall be used only for runs directly from the space in which the appliance is located through the roof or exterior wall to the outdoor atmosphere.

503.7.5 Roof penetrations. A pipe passing through a roof shall extend without interruption through the roof flashing, roof jack or roof thimble. Where a single-wall metal pipe passes through a roof constructed of combustible material, a noncombustible, nonventilating thimble shall be used at the point of passage. The thimble shall extend at least 18 inches (457 mm) above and 6 inches (152 mm) below the roof with the annular space open at the bottom and closed only at the top. The thimble shall be sized in accordance with Section 503.7.7.

503.7.6 Installation. Single-wall metal pipe shall not originate in any unoccupied attic or concealed space and shall not pass through any attic, inside wall, concealed space or floor. The installation of a single-wall metal pipe through an exterior combustible wall shall comply with Section 503.7.7.

503.7.7 Single-wall penetrations of combustible walls. A single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point of passage by a ventilated metal thimble not smaller than the following:

  1. For listed appliances with draft hoods and appliances listed for use with Type B gas vents, the thimble 89shall be not less than 4 inches (102 mm) larger in diameter than the metal pipe. Where there is a run of not less than 6 feet (1829 mm) of metal pipe in the open between the draft hood outlet and the thimble, the thimble shall be permitted to be not less than 2 inches (51 mm) larger in diameter than the metal pipe.
  2. For unlisted appliances having draft hoods, the thimble shall be not less than 6 inches (152 mm) larger in diameter than the metal pipe.
  3. For residential and low-heat appliances, the thimble shall be not less than 12 inches (305 mm) larger in diameter than the metal pipe.

Exception: In lieu of thimble protection, all combustible material in the wall shall be removed a sufficient distance from the metal pipe to provide the specified clearance from such metal pipe to combustible material. Any material used to close up such opening shall be noncombustible.

503.7.8 Clearances. Minimum clearances from single-wall metal pipe to combustible material shall be in accordance with Table 503.10.5. The clearance from single-wall metal pipe to combustible material shall be permitted to be reduced where the combustible material is protected as specified for vent connectors in Table 308.2.

503.7.9 Size of single-wall metal pipe. A venting system constructed of single-wall metal pipe shall be sized in accordance with one of the following methods and the appliance manufacturer’s instructions:

  1. For a draft-hood-equipped appliance, in accordance with Section 504.
  2. For a venting system for a single appliance with a draft hood, the areas of the connector and the pipe each shall be not less than the area of the appliance flue collar or draft hood outlet, whichever is smaller. The vent area shall not be greater than seven times the draft hood outlet area.
  3. Other approved engineering methods.

503.7.10 Pipe geometry. Any shaped single-wall metal pipe shall be permitted to be used, provided that its equivalent effective area is equal to the effective area of the round pipe for which it is substituted, and provided that the minimum internal dimension of the pipe is not less than 2 inches (51 mm).

503.7.11 Termination capacity. The vent cap or a roof assembly shall have a venting capacity of not less than that of the pipe to which it is attached.

503.7.12 Support of single-wall metal pipe. All portions of single-wall metal pipe shall be supported for the design and weight of the material employed.

503.7.13 Marking. Single-wall metal pipe shall comply with the marking provisions of Section 503.6.12.

503.8 Venting system termination location. The location of venting system terminations shall comply with the following (see Appendix C):

  1. A mechanical draft venting system shall terminate at least 3 feet (914 mm) above any forced-air inlet located within 10 feet (3048 mm).

    Exceptions:

    1. This provision shall not apply to the combustion air intake of a direct-vent appliance.
    2. This provision shall not apply to the separation of the integral outdoor air inlet and flue gas discharge of listed outdoor appliances.
  2. A mechanical draft venting system, excluding direct-vent appliances, shall terminate at least 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from, or 1 foot (305 mm) above any door, operable window or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 12 inches (305 mm) above finished ground level.
  3. The vent terminal of a direct-vent appliance with an input of 10,000 Btu per hour (3 kW) or less shall be located at least 6 inches (152 mm) from any air opening into a building, and such an appliance with an input over 10,000 Btu per hour (3 kW) but not over 50,000 Btu per hour (14.7 kW) shall be installed with a 9-inch (230 mm) vent termination clearance, and an appliance with an input over 50,000 Btu/h (14.7 kW) shall have at least a 12-inch (305 mm) vent termination clearance. The bottom of the vent terminal and the air intake shall be located at least 12 inches (305 mm) above finished ground level.
  4. Through-the-wall vents for Category II and IV appliances and noncategorized condensing appliances shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valves or other equipment. Where local experience indicates that condensate is a problem with Category I and III appliances, this provision shall also apply. Drains for condensate shall be installed in accordance with the appliance and vent manufacturers’ instructions.

503.9 Condensation drainage. Provisions shall be made to collect and dispose of condensate from venting systems serving Category II and IV appliances and noncategorized condensing appliances in accordance with Section 503.8, Item 4. Where local experience indicates that condensation is a problem, provision shall be made to drain off and dispose of condensate from venting systems serving Category I and III appliances in accordance with Section 503.8, Item 4.

503.10 Vent connectors for Category I appliances. Vent connectors for Category I appliances shall comply with Sections 503.10.1 through 503.10.14.

503.10.1 Where required. A vent connector shall be used to connect an appliance to a gas vent, chimney or single-wall

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metal pipe, except where the gas vent, chimney or single-wall metal pipe is directly connected to the appliance.

503.10.2 Materials. Vent connectors shall be constructed in accordance with Sections 503.10.2.1 through 503.10.2.5.

503.10.2.1 General. A vent connector shall be made of noncombustible corrosion-resistant material capable of withstanding the vent gas temperature produced by the appliance and of sufficient thickness to withstand physical damage.

503.10.2.2 Vent connectors located in unconditioned areas. Where the vent connector used for an appliance having a draft hood or a Category I appliance is located in or passes through attics, crawl spaces or other unconditioned spaces, that portion of the vent connector shall be listed Type B, Type L or listed vent material having equivalent insulation properties.

Exception: Single-wall metal pipe located within the exterior walls of the building in areas having a local 99-percent winter design temperature of 5°F (−15°C) or higher shall be permitted to be used in unconditioned spaces other than attics and crawl spaces.

503.10.2.3 Residential-type appliance connectors. Where vent connectors for residential-type appliances are not installed in attics or other unconditioned spaces, connectors for listed appliances having draft hoods, appliances having draft hoods and equipped with listed conversion burners and Category I appliances shall be one of the following:

  1. Type B or L vent material;
  2. Galvanized sheet steel not less than 0.018 inch (0.46 mm) thick;
  3. Aluminum (1100 or 3003 alloy or equivalent) sheet not less than 0.027 inch (0.69 mm) thick;
  4. Stainless steel sheet not less than 0.012 inch (0.31 mm) thick;
  5. Smooth interior wall metal pipe having resistance to heat and corrosion equal to or greater than that of Item 2, 3 or 4 above; or
  6. A listed vent connector.

Vent connectors shall not be covered with insulation.

Exception: Listed insulated vent connectors shall be installed in accordance with the manufacturer’s installation instructions.

503.10.2.4 Low-heat equipment. A vent connector for a nonresidential, low-heat appliance shall be a factory-built chimney section or steel pipe having resistance to heat and corrosion equivalent to that for the appropriate galvanized pipe as specified in Table 503.10.2.4. Factory-built chimney sections shall be joined together in accordance with the chimney manufacturer’s instructions.

TABLE 503.10.2.4
MINIMUM THICKNESS FOR GALVANIZED STEEL VENT CONNECTORS FOR LOW-HEAT APPLIANCES
DIAMETER OF CONNECTOR (inches) MINIMUM THICKNESS (inch)
Less than 6 0.019
6 to less than 10 0.023
10 to 12 inclusive 0.029
14 to 16 inclusive 0.034
Over 16 0.056
For SI: 1 inch = 25.4 mm.

503.10.2.5 Medium-heat appliances. Vent connectors for medium-heat appliances shall be constructed of factory-built medium-heat chimney sections or steel of a thickness not less than that specified in Table 503.10.2.5 and shall comply with the following:

  1. A steel vent connector for an appliance with a vent gas temperature in excess of 1,000°F (538°C) measured at the entrance to the connector shall be lined with medium-duty fire brick (ASTM C 64, Type F), or the equivalent.
  2. The lining shall be at least 2 ½ inches (64 mm) thick for a vent connector having a diameter or greatest cross-sectional dimension of 18 inches (457 mm) or less.
  3. The lining shall be at least 4 ½ inches (114 mm) thick laid on the 4 ½-inch (114 mm) bed for a vent connector having a diameter or greatest cross-sectional dimension greater than 18 inches (457 mm).
  4. Factory-built chimney sections, if employed, shall be joined together in accordance with the chimney manufacturer’s instructions.
TABLE 503.10.2.5
MINIMUM THICKNESS FOR STEEL VENT CONNECTORS FOR MEDIUM-HEAT APPLIANCES
VENT CONNECTOR SIZE
Diameter (inches) Area (square inches) MINIMUM THICKNESS (inch)
Up to 14 Up to 154 0.053
Over 14 to 16 154 to 201 0.067
Over 16 to 18 201 to 254 0.093
Over 18 Larger than 254 0.123
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2.

503.10.3 Size of vent connector. Vent connectors shall be sized in accordance with Sections 503.10.3.1 through 503.10.3.5.

503.10.3.1 Single draft hood and fan-assisted. A vent connector for an appliance with a single draft hood or for a Category I fan-assisted combustion system appliance shall be sized and installed in accordance with Section 504 or other approved engineering methods.

503.10.3.2 Multiple draft hood. For a single appliance having more than one draft hood outlet or flue collar, the manifold shall be constructed according to the instructions of the appliance manufacturer. Where

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there are no instructions, the manifold shall be designed and constructed in accordance with approved engineering practices. As an alternate method, the effective area of the manifold shall equal the combined area of the flue collars or draft hood outlets and the vent connectors shall have a minimum 1-foot (305 mm) rise.

503.10.3.3 Multiple appliances. Where two or more appliances are connected to a common vent or chimney, each vent connector shall be sized in accordance with Section 504 or other approved engineering methods.

As an alternative method applicable only when all of the appliances are draft hood equipped, each vent connector shall have an effective area not less than the area of the draft hood outlet of the appliance to which it is connected.

503.10.3.4 Common connector/manifold. Where two or more appliances are vented through a common vent connector or vent manifold, the common vent connector or vent manifold shall be located at the highest level consistent with available headroom and the required clearance to combustible materials and shall be sized in accordance with Section 504 or other approved engineering methods.

As an alternate method applicable only where there are two draft hood-equipped appliances, the effective area of the common vent connector or vent manifold and all junction fittings shall be not less than the area of the larger vent connector plus 50 percent of the area of the smaller flue collar outlet.

503.10.3.5 Size increase. Where the size of a vent connector is increased to overcome installation limitations and obtain connector capacity equal to the appliance input, the size increase shall be made at the appliance draft hood outlet.

503.10.4 Two or more appliances connected to a single vent or chimney. Where two or more vent connectors enter a common vent, chimney flue or single-wall metal pipe, the smaller connector shall enter at the highest level consistent with the available headroom or clearance to combustible material. Vent connectors serving Category I appliances shall not be connected to any portion of a mechanical draft system operating under positive static pressure, such as those serving Category III or IV appliances.

503.10.4.1 Two or more openings. Where two or more openings are provided into one chimney flue or vent, the openings shall be at different levels, or the connectors shall be attached to the vertical portion of the chimney or vent at an angle of 45 degrees (0.79 rad) or less relative to the vertical.

503.10.5 Clearance. Minimum clearances from vent connectors to combustible material shall be in accordance with Table 503.10.5.

Exception: The clearance between a vent connector and combustible material shall be permitted to be reduced where the combustible material is protected as specified for vent connectors in Table 308.2.

503.10.6 Joints. Joints between sections of connector piping and connections to flue collars and draft hood outlets shall be fastened by one of the following methods:

  1. Sheet metal screws.
  2. Vent connectors of listed vent material assembled and connected to flue collars or draft hood outlets in accordance with the manufacturers’ instructions.
  3. Other approved means.

503.10.7 Slope. A vent connector shall be installed without dips or sags and shall slope upward toward the vent or chimney at least ¼ inch per foot (21 mm/m).

Exception: Vent connectors attached to a mechanical draft system installed in accordance with the appliance and draft system manufacturers’ instructions.

503.10.8 Length of vent connector. The maximum horizontal length of a single-wall connector shall be 75 percent of the height of the chimney or vent except for engineered systems. The maximum horizontal length of a Type B double-wall connector shall be 100 percent of the height of the chimney or vent except for engineered systems.

TABLE 503.10.5a
CLEARANCES FOR CONNECTORS
APPLIANCE MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL
Listed Type B gas vent material Listed Type L vent material Single-wall metal pipe Factory-built chimney sections
Listed appliances with draft hoods and appliances listed for use with Type B gas vents As listed As listed 6 inches As listed
Residential boilers and furnaces with listed gas conversion burner and with draft hood 6 inches 6 inches 9 inches As listed
Residential appliances listed for use with Type L vents Not permitted As listed 9 inches As listed
Listed gas-fired toilets Not permitted As listed As listed As listed
Unlisted residential appliances with draft hood Not permitted 6 inches 9 inches As listed
Residential and low-heat appliances other than above Not permitted 9 inches 18 inches As listed
Medium-heat appliances Not permitted Not permitted 36 inches As listed
For SI: 1 inch = 25.4 mm.
a. These clearances shall apply unless the manufacturer’s installation instructions for a listed appliance or connector specify different clearances, in which case the listed clearances shall apply. 92

503.10.9 Support. A vent connector shall be supported for the design and weight of the material employed to maintain clearances and prevent physical damage and separation of joints.

503.10.10 Chimney connection. Where entering a flue in a masonry or metal chimney, the vent connector shall be installed above the extreme bottom to avoid stoppage. Where a thimble or slip joint is used to facilitate removal of the connector, the connector shall be firmly attached to or inserted into the thimble or slip joint to prevent the connector from falling out. Means shall be employed to prevent the connector from entering so far as to restrict the space between its end and the opposite wall of the chimney flue (see Section 501.9).

503.10.11 Inspection. The entire length of a vent connector shall be provided with ready access for inspection, cleaning and replacement.

503.10.12 Fireplaces. A vent connector shall not be connected to a chimney flue serving a fireplace unless the fireplace flue opening is permanently sealed.

503.10.13 Passage through ceilings, floors or walls. Single-wall metal pipe connectors shall not pass through any wall, floor or ceiling except as permitted by Section 503.7.4.

503.10.14 Medium-heat connectors. Vent connectors for medium-heat appliances shall not pass through walls or partitions constructed of combustible material.

503.11 Vent connectors for Category II, III and IV appliances. Vent connectors for Category II, III and I V appliances shall be as specified for the venting systems in accordance with Section 503.4.

503.12 Draft hoods and draft controls. The installation of draft hoods and draft controls shall comply with Sections 503.12.1 through 503.12.7.

503.12.1 Appliances requiring draft hoods. Vented appliances shall be installed with draft hoods.

Exception: Dual oven-type combination ranges; direct-vent appliances; fan-assisted combustion system appliances; appliances requiring chimney draft for operation; single firebox boilers equipped with conversion burners with inputs greater than 400,000 Btu per hour (117 kW); appliances equipped with blast, power or pressure burners that are not listed for use with draft hoods; and appliances designed for forced venting.

503.12.2 Installation. A draft hood supplied with or forming a part of a listed vented appliance shall be installed without alteration, exactly as furnished and specified by the appliance manufacturer.

503.12.2.1 Draft hood required. If a draft hood is not supplied by the appliance manufacturer where one is required, a draft hood shall be installed, shall be of a listed or approved type and, in the absence of other instructions, shall be of the same size as the appliance flue collar. Where a draft hood is required with a conversion burner, it shall be of a listed or approved type.

503.12.2.2 Special design draft hood. Where it is determined that a draft hood of special design is needed or preferable for a particular installation, the installation shall be in accordance with the recommendations of the appliance manufacturer and shall be approved.

503.12.3 Draft control devices. Where a draft control device is part of the appliance or is supplied by the appliance manufacturer, it shall be installed in accordance with the manufacturer’s instructions. In the absence of manufacturer’s instructions, the device shall be attached to the flue collar of the appliance or as near to the appliance as practical.

503.12.4 Additional devices. Appliances requiring a controlled chimney draft shall be permitted to be equipped with a listed double-acting barometric-draft regulator installed and adjusted in accordance with the manufacturer’s instructions.

503.12.5 Location. Draft hoods and barometric draft regulators shall be installed in the same room or enclosure as the appliance in such a manner as to prevent any difference in pressure between the hood or regulator and the combustion air supply.

503.12.6 Positioning. Draft hoods and draft regulators shall be installed in the position for which they were designed with reference to the horizontal and vertical planes and shall be located so that the relief opening is not obstructed by any part of the appliance or adjacent construction. The appliance and its draft hood shall be located so that the relief opening is accessible for checking vent operation.

503.12.7 Clearance. A draft hood shall be located so its relief opening is not less than 6 inches (152 mm) from any surface except that of the appliance it serves and the venting system to which the draft hood is connected. Where a greater or lesser clearance is indicated on the appliance label, the clearance shall be not less than that specified on the label. Such clearances shall not be reduced.

503.13 Manually operated dampers. A manually operated damper shall not be placed in the vent connector for any appliance. Fixed baffles shall not be classified as manually operated dampers.

503.14 Automatically operated vent dampers. An automatically operated vent damper shall be of a listed type.

503.15 Obstructions. Devices that retard the flow of vent gases shall not be installed in a vent connector, chimney or vent. The following shall not be considered as obstructions:

  1. Draft regulators and safety controls specifically listed for installation in venting systems and installed in accordance with the manufacturer’s installation instructions.
  2. Approved draft regulators and safety controls that are designed and installed in accordance with approved engineering methods.
  3. Listed heat reclaimers and automatically operated vent dampers installed in accordance with the manufacturer’s installation instructions. 93
  4. Approved economizers, heat reclaimers and recuperators installed in venting systems of appliances not required to be equipped with draft hoods, provided that the appliance manufacturer’s instructions cover the installation of such a device in the venting system and performance in accordance with Sections 503.3 and 503.3.1 is obtained.
  5. Vent dampers serving listed appliances installed in accordance with Sections 504.2.1 and 504.3.1 or other approved engineering methods.

503.16 Outside wall penetrations. Where vents, including those for direct-vent appliances, penetrate outside walls of buildings, the annular spaces around such penetrations shall be permanently sealed using approved materials to prevent entry of combustion products into the building.

SECTION 504 (IFGS)
SIZING OF CATEGORY I APPLIANCE VENTING SYSTEMS

504.1 Definitions. The following definitions apply to the tables in this section.

APPLIANCE CATEGORIZED VENT DIAMETER/AREA. The minimum vent area/diameter permissible for Category I appliances to maintain a nonpositive vent static pressure when tested in accordance with nationally recognized standards.

FAN-ASSISTED COMBUSTION SYSTEM. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.

FAN Min. The minimum input rating of a Category I fan-assisted appliance attached to a vent or connector.

FAN Max. The maximum input rating of a Category I fan-assisted appliance attached to a vent or connector.

NAT Max. The maximum input rating of a Category I draft-hood-equipped appliance attached to a vent or connector.

FAN + FAN. The maximum combined appliance input rating of two or more Category I fan-assisted appliances attached to the common vent.

FAN + NAT. The maximum combined appliance input rating of one or more Category I fan-assisted appliances and one or more Category I draft-hood-equipped appliances attached to the common vent.

NA. Vent configuration is not allowed due to potential for condensate formation or pressurization of the venting system, or not applicable due to physical or geometric restraints.

NAT + NAT. The maximum combined appliance input rating of two or more Category I draft-hood-equipped appliances attached to the common vent.

504.2 Application of single-appliance vent Tables 504.2(1) through 504.2(6). The application of Tables 504.2(1) through 504.2(6) shall be subject to the requirements of Sections 504.2.1 through 504.2.17.

504.2.1 Vent obstructions. These venting tables shall not be used where obstructions, as described in Section 503.15, are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer’s instructions or in accordance with the following:

  1. The maximum capacity of the vent system shall be determined using the “NAT Max” column.
  2. The minimum capacity shall be determined as if the appliance were a fan-assisted appliance, using the “FAN Min” column to determine the minimum capacity of the vent system. Where the corresponding “FAN Min” is “NA,” the vent configuration shall not be permitted and an alternative venting configuration shall be utilized.

504.2.2 Minimum size. Where the vent size determined from the tables is smaller than the appliance draft hood outlet or flue collar, the smaller size shall be permitted to be used provided that all of the following requirements are met:

  1. The total vent height (H) is at least 10 feet (3048 mm).
  2. Vents for appliance draft hood outlets or flue collars 12 inches (305 mm) in diameter or smaller are not reduced more than one table size.
  3. Vents for appliance draft hood outlets or flue collars larger than 12 inches (305 mm) in diameter are not reduced more than two table sizes.
  4. The maximum capacity listed in the tables for a fan-assisted appliance is reduced by 10 percent (0.90 × maximum table capacity).
  5. The draft hood outlet is greater than 4 inches (102 mm) in diameter. Do not connect a 3-inch-diameter (76 mm) vent to a 4-inch-diameter (102 mm) draft hood outlet. This provision shall not apply to fan-assisted appliances.

504.2.3 Vent offsets. Single-appliance venting configurations with zero (0) lateral lengths in Tables 504.2(1), 504.2(2) and 504.2(5) shall not have elbows in the venting system. Single-appliance venting configurations with lateral lengths include two 90-degree (1.57 rad) elbows. For each additional elbow up to and including 45 degrees (0.79 rad), the maximum capacity listed in the venting tables shall be reduced by 5 percent. For each additional elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum capacity listed in the venting tables shall be reduced by 10 percent. Where multiple offsets occur in a vent, the total lateral length of all offsets combined shall not exceed that specified in Tables 504.2(1) through 504.2(5).

504.2.4 Zero lateral. Zero (0) lateral (L) shall apply only to a straight vertical vent attached to a top outlet draft hood or flue collar.

504.2.5 High-altitude installations. Sea-level input ratings shall be used when determining maximum capacity for high altitude installation. Actual input (derated for altitude) shall be used for determining minimum capacity for high altitude installation.

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504.2.6 Multiple input rate appliances. For appliances with more than one input rate, the minimum vent capacity (FAN Min) determined from the tables shall be less than the lowest appliance input rating, and the maximum vent capacity (FAN Max/NAT Max) determined from the tables shall be greater than the highest appliance rating input.

504.2.7 Liner system sizing and connections. Listed corrugated metallic chimney liner systems in masonry chimneys shall be sized by using Table 504.2(1) or 504.2(2) for Type B vents with the maximum capacity reduced by 20 percent (0.80 × maximum capacity) and the minimum capacity as shown in Table 504.2(1) or 504.2(2). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with Section 504.2.3. The 20-percent reduction for corrugated metallic chimney liner systems includes an allowance for one long-radius 90-degree (1.57 rad) turn at the bottom of the liner.

Connections between chimney liners and listed double-wall connectors shall be made with listed adapters designed for such purpose.

504.2.8 Vent area and diameter. Where the vertical vent has a larger diameter than the vent connector, the vertical vent diameter shall be used to determine the minimum vent capacity, and the connector diameter shall be used to determine the maximum vent capacity. The flow area of the vertical vent shall not exceed seven times the flow area of the listed appliance categorized vent area, flue collar area or draft hood outlet area unless designed in accordance with approved engineering methods.

504.2.9 Chimney and vent locations. Tables 504.2(1). 504.2(2), 504.2(3), 504.2(4) and 504.2(5) shall be used only for chimneys and vents not exposed to the outdoors below the roof line. A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Where vents extend outdoors above the roof more than 5 feet (1524 mm) higher than required by Figure 503.6.4, and where vents terminate in accordance with Section 503.6.4, Item 2, the outdoor portion of the vent shall be enclosed as required by this section for vents not considered to be exposed to the outdoors or such venting system shall be engineered. A Type B vent shall not be considered to be exposed to the outdoors where it passes through an unventilated enclosure or chase insulated to a value of not less than R8.

Table 504.2(3) in combination with Table 504.2(6) shall be used for clay-tile-lined exterior masonry chimneys, provided that all of the following are met:

  1. Vent connector is a Type B double wall.
  2. Vent connector length is limited to 1 ½ feet for each inch (18 mm per mm) of vent connector diameter.
  3. The appliance is draft hood equipped.
  4. The input rating is less than the maximum capacity given by Table 504.2(3).
  5. For a water heater, the outdoor design temperature is not less than5°F (−15°C).
  6. For a space-heating appliance, the input rating is greater than the minimum capacity given by Table 504.2(6).

504.2.10 Corrugated vent connector size. Corrugated vent connectors shall be not smaller than the listed appliance categorized vent diameter, flue collar diameter or draft hood outlet diameter.

504.2.11 Vent connector size limitation. Vent connectors shall not be increased in size more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter or draft hood outlet diameter.

504.2.12 Component commingling. In a single run of vent or vent connector, different diameters and types of vent and connector components shall be permitted to be used, provided that all such sizes and types are permitted by the tables.

504.2.13 Draft hood conversion accessories. Draft hood conversion accessories for use with masonry chimneys venting listed Category I fan-assisted appliances shall be listed and installed in accordance with the manufacturer’s installation instructions for such listed accessories.

504.2.14 Table interpolation. Interpolation shall be permitted in calculating capacities for vent dimensions that fall between the table entries.

504.2.15 Extrapolation prohibited. Extrapolation beyond the table entries shall not be permitted.

504.2.16 Engineering calculations. For vent heights less than 6 feet (1829 mm) and greater than shown in the tables, engineering methods shall be used to calculate vent capacities.

504.2.17 Height entries. Where the actual height of a vent falls between entries in the height column of the applicable table in Tables 504.2(1) through 504.2(6), either interpolation shall be used or the lower appliance input rating shown in the table entries shall be used for FAN MAX and NAT MAX column values and the higher appliance input rating shall be used for the FAN MIN column values.

504.3 Application of multiple appliance vent Tables 504.3(1) through 504.3(7). The application of Tables 504.3(1) through 504.3(7) shall be subject to the requirements of Sections 504.3.1 through 504.3.28.

504.3.1 Vent obstructions. These venting tables shall not be used where obstructions, as described in Section 503.15, are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer’s instructions or in accordance with the following:

  1. The maximum capacity of the vent connector shall be determined using the NAT Max column.
  2. The maximum capacity of the vertical vent or chimney shall be determined using the FAN+NAT column when the second appliance is a fan-assisted appliance, or the NAT+NAT column when the second appliance is equipped with a draft hood. 95
  3. The minimum capacity shall be determined as if the appliance were a fan-assisted appliance.

    3.1. The minimum capacity of the vent connector shall be determined using the FAN Min column.

    3.2. The FAN+FAN column shall be used where the second appliance is a fan-assisted appliance, and the FAN+NAT column shall be used where the second appliance is equipped with a draft hood, to determine whether the vertical vent or chimney configuration is not permitted (NA). Where the vent configuration is NA, the vent configuration shall not be permitted and an alternative venting configuration shall be utilized.

504.3.2 Connector length limit. The vent connector shall be routed to the vent utilizing the shortest possible route. Except as provided in Section 504.3.3, the maximum vent connector horizontal length shall be 1 ½ feet for each inch (18 mm per mm) of connector diameter as shown in Table 504.3.2.

TABLE 504.3.2
MAXIMUM VENT CONNECTOR LENGTH
CONNECTOR DIAMETER(inches) CONNECTOR MAXIMUM HORIZONTAL LENGTH (feet)
3 4 ½
4 6
5 7 ½
6 9
7 10 ½
8 12
9 13 ½
10 15
12 18
14 21
16 24
18 27
20 30
22 33
24 36
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

504.3.3 Connectors with longer lengths. Connectors with longer horizontal lengths than those listed in Section 504.3.2 are permitted under the following conditions:

  1. The maximum capacity (FAN Max or NAT Max) of the vent connector shall be reduced 10 percent for each additional multiple of the length allowed by Section 504.3.2. For example, the maximum length listed in Table 504.3.2 for a 4-inch (102 mm) connector is 6 feet (1829 mm). With a connector length greater than 6 feet (1829 mm) but not exceeding 12 feet (3658 mm), the maximum capacity must be reduced by 10 percent (0.90 × maximum vent connector capacity). With a connector length greater than 12 feet (3658 mm) but not exceeding 18 feet (5486 mm), the maximum capacity must be reduced by 20 percent (0.80 × maximum vent capacity).
  2. For a connector serving a fan-assisted appliance, the minimum capacity (FAN Min) of the connector shall be determined by referring to the corresponding single appliance table. For Type B double-wall connectors, Table 504.2(1) shall be used. For single-wall connectors, Table 504.2(2) shall be used. The height (H) and lateral (L) shall be measured according to the procedures for a single-appliance vent, as if the other appliances were not present.

504.3.4 Vent connector manifold. Where the vent connectors are combined prior to entering the vertical portion of the common vent to form a common vent manifold, the size of the common vent manifold and the common vent shall be determined by applying a 10-percent reduction (0.90 × maximum common vent capacity) to the common vent capacity part of the common vent tables. The length of the common vent connector manifold (Lm) shall not exceed 1 ½ feet for each inch (18 mm per mm) of common vent connector manifold diameter (D).

504.3.5 Common vertical vent offset. Where the common vertical vent is offset, the maximum capacity of the common vent shall be reduced in accordance with Section 504.3.6. The horizontal length of the common vent offset (LJ shall not exceed 1 ½ feet for each inch (18 mm per mm) of common vent diameter (D). Where multiple offsets occur in a common vent, the total horizontal length of all offsets combined shall not exceed 1 ½ feet for each inch (18 mm per mm) of common vent diameter(D).

504.3.6 Elbows in vents. For each elbow up to and including 45 degrees (0.79 rad) in the common vent, the maximum common vent capacity listed in the venting tables shall be reduced by 5 percent. For each elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum common vent capacity listed in the venting tables shall be reduced by 10 percent.

504.3.7 Elbows in connectors. The vent connector capacities listed in the common vent sizing tables include allowance for two 90-degree (1.57 rad) elbows. For each additional elbow up to and including 45 degrees (0.79 rad), the maximum vent connector capacity listed in the venting tables shall be reduced by 5 percent. For each elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum vent connector capacity listed in the venting tables shall be reduced by 10 percent.

504.3.8 Common vent minimum size. The cross-sectional area of the common vent shall be equal to or greater than the cross-sectional area of the largest connector.

504.3.9 Common vent fittings. At the point where tee or wye fittings connect to a common vent, the opening size of the fitting shall be equal to the size of the common vent. Such fittings shall not be prohibited from having reduced-size 96openings at the point of connection of appliance vent connectors.

504.3.9.1 Tee and wye fittings. Tee and wye fittings connected to a common gas vent shall be considered as part of the common gas vent and shall be constructed of materials consistent with that of the common gas vent.

504.3.10 High-altitude installations. Sea-level input ratings shall be used when determining maximum capacity for high-altitude installation. Actual input (derated for altitude) shall be used for determining minimum capacity for high-altitude installation.

504.3.11 Connector rise measurement. Connector rise (R) for each appliance connector shall be measured from the draft hood outlet or flue collar to the centerline where the vent gas streams come together.

504.3.12 Vent height measurement. For multiple appliances all located on one floor, available total height (H) shall be measured from the highest draft hood outlet or flue collar up to the level of the outlet of the common vent.

504.3.13 Multistory height measurement. For multistory installations, available total height (H) for each segment of the system shall be the vertical distance between the highest draft hood outlet or flue collar entering that segment and the centerline of the next higher interconnection tee.

504.3.14 Multistory lowest portion sizing. The size of the lowest connector and of the vertical vent leading to the lowest interconnection of a multistory system shall be in accordance with Table 504.2(1) or 504.2(2) for available total height (H) up to the lowest interconnection.

504.3.15 Multistory common vents. Where used in multistory systems, vertical common vents shall be Type B double wall and shall be installed with a listed vent cap.

504.3.16 Multistory common vent offsets. Offsets in multistory common vent systems shall be limited to a single offset in each system, and systems with an offset shall comply with all of the following:

  1. The offset angle shall not exceed 45 degrees (0.79 rad) from vertical.
  2. The horizontal length of the offset shall not exceed 1 ½ feet for each inch (18 mm per mm) of common vent diameter of the segment in which the offset is located.
  3. For the segment of the common vertical vent containing the offset, the common vent capacity listed in the common venting tables shall be reduced by 20 percent (0.80 × maximum common vent capacity).
  4. A multistory common vent shall not be reduced in size above the offset.

504.3.17 Vertical vent maximum size. Where two or more appliances are connected to a vertical vent or chimney, the flow area of the largest section of vertical vent or chimney shall not exceed seven times the smallest listed appliance categorized vent areas, flue collar area or draft hood outlet area unless designed in accordance with approved engineering methods.

504.3.18 Multiple input rate appliances. For appliances with more than one input rate, the minimum vent connector capacity (FAN Min) determined from the tables shall be less than the lowest appliance input rating, and the maximum vent connector capacity (“FAN Max or NAT Max) determined from the tables shall be greater than the highest appliance input rating.

504.3.19 Liner system sizing and connections. Listed, corrugated metallic chimney liner systems in masonry chimneys shall be sized by using Table 504.3(1) or 504.3(2) for Type B vents, with the maximum capacity reduced by 20 percent (0.80 × maximum capacity) and the minimum capacity as shown in Table 504.3(1) or 504.3(2). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with Sections 504.3.5 and 504.3.6. The 20-percent reduction for corrugated metallic chimney liner systems includes an allowance for one long-radius 90-degree (1.57 rad) turn at the bottom of the liner. Where double-wall connectors are required, tee and wye fittings used to connect to the common vent chimney liner shall be listed double-wall fittings. Connections between chimney liners and listed double-wall fittings shall be made with listed adapter fittings designed for such purpose.

504.3.20 Chimney and vent location. Tables 504.3(1), 504.3(2), 504.3(3), 504.3(4) and 504.3(5) shall be used only for chimneys and vents not exposed to the outdoors below the roof line. A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Where vents extend outdoors above the roof more than 5 feet (1524 mm) higher than required by Figure 503.6.4 and where vents terminate in accordance with Section 503.6.4, Item 2, the outdoor portion of the vent shall be enclosed as required by this section for vents not considered to be exposed to the outdoors or such venting system shall be engineered. A Type B vent shall not be considered to be exposed to the outdoors where it passes through an unventilated enclosure or chase insulated to a value of not less than R8.

Tables 504.3(6a), 504.3(6b), 504.3(7a) and 504.3(7b) shall be used for clay-tile-lined exterior masonry chimneys, provided that all of the following conditions are met:

  1. Vent connector is Type B double wall.
  2. At least one appliance is draft hood equipped.
  3. The combined appliance input rating is less than the maximum capacity given by Table 504.3(6a) for NAT+NAT or Table 504.3(7a) for FAN+NAT.
  4. The input rating of each space-heating appliance is greater than the minimum input rating given by Table 504.3(6b) for NAT+NAT or Table 504.3(7b) for FAN+NAT.
  5. The vent connector sizing is in accordance with Table 504.3(3).

504.3.21 Connector maximum and minimum size. Vent connectors shall not be increased in size more than two sizes greater than the listed appliance categorized vent

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diameter, flue collar diameter or draft hood outlet diameter. Vent connectors for draft hood-equipped appliances shall not be smaller than the draft hood outlet diameter. Where a vent connector size(s) determined from the tables for a fan-assisted appliance(s) is smaller than the flue collar diameter, the use of the smaller size(s) shall be permitted provided that the installation complies with all of the following conditions:

  1. Vent connectors for fan-assisted appliance flue collars 12 inches (305mm) in diameter or smaller are not reduced by more than one table size [e.g., 12 inches to 10 inches (305 mm to 254 mm) is a one-size reduction] and those larger than 12 inches (305 mm) in diameter are not reduced more than two table sizes [e.g., 24 inches to 20 inches (610 mm to 508 mm) is a two-size reduction].
  2. The fan-assisted appliance(s) is common vented with a draft-hood-equipped appliance(s).
  3. The vent connector has a smooth interior wall.

504.3.22 Component commingling. All combinations of pipe sizes, single-wall and double-wall metal pipe shall be allowed within any connector run(s) or within the common vent, provided that all of the appropriate tables permit all of the desired sizes and types of pipe, as if they were used for the entire length of the subject connector or vent. Where single-wall and Type B double-wall metal pipes are used for vent connectors within the same venting system, the common vent must be sized using Table 504.3(2) or 504.3(4), as appropriate.

504.3.23 Draft hood conversion accessories. Draft hood conversion accessories for use with masonry chimneys venting listed Category I fan-assisted appliances shall be listed and installed in accordance with the manufacturer’s installation instructions for such listed accessories.

504.3.24 Multiple sizes permitted. Where a table permits more than one diameter of pipe to be used for a connector or vent, all the permitted sizes shall be permitted to be used.

504.3.25 Table interpolation. Interpolation shall be permitted in calculating capacities for vent dimensions that fall between table entries.

504.3.26 Extrapolation prohibited. Extrapolation beyond the table entries shall not be permitted.

504.3.27 Engineering calculations. For vent heights less than 6 feet (1829 mm) and greater than shown in the tables, engineering methods shall be used to calculate vent capacities.

504.3.28 Height entries. Where the actual height of a vent falls between entries in the height column of the applicable table in Tables 504.3(1) through 504.3(7b), either interpolation shall be used or the lower appliance input rating shown in the table shall be used for FAN MAX and NAT MAX column values and the higher appliance input rating shall be used for the FAN MIN column values.

SECTION 505 (IFGC)
DIRECT-VENT, INTEGRAL VENT, MECHANICAL VENT AND VENTILATION/EXHAUST HOOD VENTING

505.1 General. The installation of direct-vent and integral vent appliances shall be in accordance with Section 503. Mechanical venting systems and exhaust hood venting systems shall be designed and installed in accordance with Section 503.

505.1.1 Commercial cooking appliances vented by exhaust hoods. Where commercial cooking appliances are vented by means of the Type I or II kitchen exhaust hood system that serves such appliances, the exhaust system shall be fan powered and the appliances shall be interlocked with the exhaust hood system to prevent appliance operation when the exhaust hood system is not operating. The method of interlock between the exhaust hood system and the appliances equipped with standing pilot burner ignition systems shall not cause such pilots to be extinguished. Where a solenoid valve is installed in the gas piping as part of an interlock system, gas piping shall not be installed to bypass such valve. Dampers shall not be installed in the exhaust system.

Exception: An interlock between the cooking appliance^) and the exhaust hood system shall not be required where heat sensors or other approved methods automatically activate the exhaust hood system when cooking operations occur.

SECTION 506 (IFGC)
FACTORY-BUILT CHIMNEYS

506.1 Building heating appliances. Factory-built chimneys for building heating appliances producing flue gases having a temperature not greater than 1,000°F (538°C), measured at the entrance to the chimney, shall be listed and labeled in accordance with UL 103 and shall be installed and terminated in accordance with the manufacturer’s installation instructions.

506.2 Support. Where factory-built chimneys are supported by structural members, such as joists and rafters, such members shall be designed to support the additional load.

506.3 Medium-heat appliances. Factory-built chimneys for medium-heat appliances producing flue gases having a temperature above 1,000°F (538°C), measured at the entrance to the chimney, shall be listed and labeled in accordance with UL 959 and shall be installed and terminated in accordance with the manufacturer’s installation instructions.

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TABLE 504.2(1)
TYPE B DOUBLE-WALL GAS VENT
  Number of Appliances Single
Appliance Type Category 1
Appliance Vent Connection Connected directly to vent
HEIGHT
(H)
(feet)
LATERAL
(L)
(feet)
VENT DIAMETER–(D) inches
3 4 5 6 7 8 9 10 12 14 16 18 20 22 24
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 0 0 78 46 0 152 86 0 251 141 0 375 205 0 524 285 0 698 370 0 897 470 0 1,121 570 0 1,645 850 0 2,267 1,170 0 2,983 1,530 0 3,802 1,960 0 4,721 2,430 0 5,737 2,950 0 6,853 3,520
2 13 51 36 18 97 67 27 157 105 32 232 157 44 321 217 53 425 285 63 543 370 75 675 455 103 982 650 138 1,346 890 178 1,769 1,170 225 2,250 1,480 296 2,782 1,850 360 3,377 2,220 426 4,030 2,670
4 21 49 34 30 94 64 39 1,53 103 50 227 153 66 316 211 79 419 279 93 536 362 110 668 445 147 975 640 191 1,338 880 242 1,761 1,160 300 2,242 1,475 390 2,774 1,835 469 3,370 2,215 555 4,023 2,660
6 25 46 32 36 91 61 47 149 100 59 223 149 78 310 205 93 413 273 110 530 354 128 661 435 171 967 630 219 1,330 870 276 1,753 1,150 341 2,235 1,470 437 2,767 1,820 523 3,363 2,210 618 4,017 2,650
8 0 0 84 50 0 165 94 0 276 155 0 415 235 0 583 320 0 780 415 0 1,006 537 0 1,261 660 0 1,858 970 0 2,571 1,320 0 3,399 1,740 0 4,333 2,220 0 5,387 2,750 0 6,555 3,360 0 7,838 4,010
2 12 57 40 16 109 75 25 178 120 28 263 180 42 365 247 50 483 322 60 619 418 71 770 515 98 1,124 745 130 1,543 1,020 168 2,030 1,340 212 2,584 1,700 278 3,196 2,110 336 3,882 2,560 401 4,634 3,050
5 23 53 38 32 103 71 42 171 115 53 255 173 70 356 237 83 473 313 99 607 407 115 758 503 154 1,110 733 199 1,528 1,010 251 2,013 1,330 311 2,563 1,685 398 3,180 2,090 476 3,863 2,545 562 4,612 3,040
8 28 49 35 39 98 66 51 164 109 64 247 165 84 347 227 99 463 303 117 596 396 137 746 490 180 1,097 720 231 1,514 1,000 289 2,000 1,320 354 2,552 1,670 450 3,163 2,070 537 3,850 2,530 630 4,602 3,030
10 0 0 88 53 0 175 100 0 295 166 0 447 255 0 631 345 0 847 450 0 1,096 585 0 1,377 720 0 2,036 1,060 0 2,825 1,450 0 3,742 1,925 0 4,782 2,450 0 5,955 3,050 0 7,254 3,710 0 8,682 4,450
2 12 61 42 17 118 81 23 194 129 26 289 195 40 402 273 48 533 355 57 684 457 68 852 560 93 1,244 850 124 1,713 1,130 161 2,256 1,480 202 2,868 1,890 264 3,556 2,340 319 4,322 2,840 378 5,153 3,390
5 23 57 40 32 113 77 41 187 124 52 280 188 68 392 263 81 522 346 95 671 446 112 839 547 149 1,229 829 192 1,696 1,105 243 2,238 1,461 300 2,849 1,871 382 3,536 2,318 458 4,301 2,818 540 5,132 3,371
10 30 51 36 41 104 70 54 176 115 67 267 175 88 376 245 104 504 330 122 651 427 142 817 525 187 1,204 795 238 1,669 1,080 298 2,209 1,430 364 2,818 1,840 459 3,504 2,280 546 4,268 2,780 641 5,099 3,340
15 0 0 94 58 0 191 112 0 327 187 0 502 285 0 716 390 0 970 525 0 1,263 682 0 1,596 840 0 2,380 1,240 0 3,323 1,720 0 4,423 2,270 0 5,678 2,900 0 7,099 3,620 0 8,665 4,410 0 10,393 5,300
2 11 69 48 15 136 93 20 226 150 22 339 225 38 475 316 45 633 414 53 815 544 63 1,019 675 86 1,495 985 114 2,062 1,350 147 2,719 1,770 186 3,467 2,260 239 4,304 2,800 290 5,232 3,410 346 6,251 4,080
5 22 65 45 30 130 87 39 219 142 49 330 217 64 463 300 76 620 403 90 800 529 105 1,003 660 140 1,476 967 182 2,041 1,327 229 2,696 1,748 283 3,442 2,235 355 4,278 2,777 426 5,204 3,385 501 6,222 4,057
10 29 59 41 40 121 82 51 206 135 64 315 208 84 445 288 99 600 386 116 777 507 135 977 635 177 1,446 936 227 2,009 1,289 283 2,659 1,712 346 3,402 2,193 432 4,234 2,739 510 5,159 3,343 599 6,175 4,019
15 35 53 37 48 112 76 61 195 128 76 301 198 98 429 275 115 580 373 134 755 491 155 953 610 202 1,418 905 257 1,976 1,250 318 2,623 1,675 385 3,363 2,150 479 4,192 2,700 564 5,115 3,300 665 6,129 3,980
20 0 0 97 61 0 202 119 0 349 202 0 540 307 0 776 430 0 1,057 575 0 1,384 752 0 1,756 930 0 2,637 1,350 0 3,701 1,900 0 4,948 2,520 0 6,376 3,250 0 7,988 4,060 0 9,785 4,980 0 11,753 6,000
2 10 75 51 14 149 100 18 250 166 20 377 249 33 531 346 41 711 470 50 917 612 59 1,150 755 81 1,694 1,100 107 2,343 1,520 139 3,097 2,000 175 3,955 2,570 220 4,916 3,200 269 5,983 3,910 321 7,154 4,700
5 21 71 48 29 143 96 38 242 160 47 367 241 62 519 337 73 697 460 86 902 599 101 1,133 738 135 1,674 1,079 174 2,320 1,498 219 3,071 1,978 270 3,926 2,544 337 4,885 3,174 403 5,950 3,880 475 7,119 4,662
10 28 64 44 38 133 89 50 229 150 62 351 228 81 499 321 95 675 443 112 877 576 130 1,105 710 172 1,641 1,045 220 2,282 1,460 273 3,029 1,940 334 3,880 2,500 413 4,835 3,130 489 5,896 3,830 573 7,063 4,600
15 34 58 40 46 124 84 59 217 142 73 337 217 94 481 308 111 654 427 129 853 557 150 1,078 688 195 1,609 1,018 248 2,245 1,425 306 2,988 1,910 372 3,835 2,465 459 4,786 3,090 541 5,844 3,795 631 7,007 4,575
20 48 52 35 55 116 78 69 206 134 84 322 206 107 464 295 125 634 410 145 830 537 99 167 1,052 665 217 1,578 990 273 2,210 1,390 335 2,948 1,880 404 3,791 2,430 495 4,737 3,050 585 5,792 3,760 689 6,953 4,550 101
30 0 0 100 64 0 213 128 0 374 220 0 587 336 0 853 475 0 1,173 650 0 1,548 855 0 1,977 1,060 0 3,004 1,550 0 4,252 2,170 0 5,725 2,920 0 7,420 3,770 0 9,341 4,750 0 11,483 5,850 0 13,848 7,060
2 9 81 56 13 166 112 14 283 185 18 432 280 27 613 394 33 826 535 42 1,072 700 54 1,351 865 74 2,004 1,310 98 2,786 1,800 127 3,696 2,380 159 4,734 3,050 199 5,900 3,810 241 7,194 4,650 285 8,617 5,600
5 21 77 54 28 160 108 36 275 176 45 421 273 58 600 385 69 811 524 82 1,055 688 96 1,332 851 127 1,981 1,289 164 2,759 1,775 206 3,666 2,350 252 4,701 3,020 312 5,863 3,783 373 7,155 4,622 439 8,574 5,552
10 27 70 50 37 150 102 48 262 171 59 405 261 77 580 371 91 788 507 107 1,028 668 125 1,301 829 164 1,944 1,254 209 2,716 1,733 259 3,617 2,300 316 4,647 2,970 386 5,803 3,739 456 7,090 4,574 535 8,505 5,471
15 33 64 NA 44 141 96 57 249 163 70 389 249 90 560 357 105 765 490 124 1,002 648 143 1,272 807 187 1,908 1,220 237 2,674 1,692 292 3,570 2,250 354 4,594 2,920 431 5,744 3,695 507 7,026 4,527 590 8,437 5,391
20 56 58 NA 53 132 90 66 237 154 80 374 237 102 542 343 119 743 473 139 977 628 160 1,243 784 207 1,873 1,185 260 2,633 1,650 319 3,523 2,200 384 4,542 2,870 467 5,686 3,650 548 6,964 4,480 639 8,370 5,310
30 NA NA NA 73 113 NA 88 214 NA 104 346 219 131 507 321 149 702 444 171 929 594 195 1,189 745 246 1,807 1,130 305 2,555 1,585 369 3,433 2,130 440 4,442 2,785 540 5,574 3,565 635 6,842 4,375 739 8,239 5,225
50 0 0 101 67 0 216 134 0 397 232 0 633 363 0 932 518 0 1,297 708 0 1,730 952 0 2,231 1,195 0 3,441 1,825 0 4,934 2,550 0 6,711 3,440 0 8,774 4,460 0 11,129 5,635 0 13,767 6,940 0 16,694 8,430
2 8 86 61 11 183 122 14 320 206 15 497 314 22 715 445 26 975 615 33 1,276 813 41 1,620 1,010 66 2,431 1,513 86 3,409 2,125 113 4,554 2,840 141 5,864 3,670 171 7,339 4,630 209 8,980 5,695 251 10,788 6,860
5 20 82 NA 27 177 119 35 312 200 43 487 308 55 702 438 65 960 605 77 1,259 798 90 1,600 996 118 2,406 1,495 151 3,380 2,102 191 4,520 2,813 234 5,826 3,639 283 7,295 4,597 336 8,933 5,654 394 10,737 6,818
10 26 76 NA 35 168 114 45 299 190 56 471 298 73 681 426 86 935 589 101 1,230 773 118 1,567 972 154 2,366 1,466 196 3,332 2,064 243 4,464 2,767 295 5,763 3,585 355 7,224 4,542 419 8,855 5,585 491 10,652 6,749
15 59 70 NA 42 158 NA 54 287 180 66 455 288 85 662 413 100 911 572 117 1,203 747 136 1,536 948 177 2,327 1,437 222 3,285 2,026 274 4,409 2,721 330 5,701 3,534 396 7,155 4,511 465 8,779 5,546 542 10,570 6,710
20 NA NA NA 50 149 NA 63 275 169 76 440 278 97 642 401 113 888 556 131 1,176 722 151 1,505 924 195 2,288 1,408 244 3,239 1,987 300 4,356 2,675 361 5,641 3,481 433 7,086 4,479 506 8,704 5,506 586 10,488 6,670
30 NA NA NA 69 131 NA 84 250 NA 99 410 259 123 605 376 141 844 522 161 1,125 670 183 1,446 876 232 2,214 1,349 287 3,150 1,910 347 4,253 2,631 412 5,523 3,431 494 6,953 4,421 577 8,557 5,444 672 10,328 6,603
100 0 NA NA NA 0 218 NA 0 407 NA 0 665 400 0 997 560 0 1,411 770 0 1,908 1,040 0 2,491 1,310 0 3,925 2,050 0 5,729 2,950 0 7,914 4,050 0 10,485 5,300 0 13,454 6,700 0 16,817 8,600 0 20,578 10,300
2 NA NA NA 10 194 NA 12 354 NA 13 566 375 18 831 510 21 1,155 700 25 1,536 935 30 1,975 1,170 44 3,027 1,820 72 4,313 2,550 95 5,834 3,500 120 7,591 4,600 138 9,577 5,800 169 11,803 7,200 204 14,264 8,800
5 NA NA NA 26 189 NA 33 347 NA 40 557 369 52 820 504 60 1,141 692 71 1,519 926 82 1,955 1,159 107 3,002 1,803 136 4,282 2,531 172 5,797 3,475 208 7,548 4,566 245 9,528 5,769 293 11,748 7,162 341 14,204 8,756
10 NA NA NA 33 182 NA 43 335 NA 53 542 361 68 801 493 80 1,118 679 94 1,492 910 108 1,923 1,142 142 2,961 1,775 180 4,231 2,500 223 5,737 3,434 268 7,478 4,509 318 9,447 5,717 374 11,658 7,100 436 14,105 8,683
15 NA NA NA 40 174 NA 50 321 NA 62 528 353 80 782 482 93 1,095 666 109 1,465 895 126 1,892 1,124 163 2,920 1,747 206 4,182 2,469 252 5,678 3,392 304 7,409 4,451 358 9,367 5,665 418 11,569 7,037 487 14,007 8,610
20 NA NA NA 47 166 NA 59 311 NA 71 513 344 90 763 471 105 1,073 653 122 1,438 880 141 1,861 1,107 181 2,880 1,719 226 4,133 2,438 277 5,619 3,351 330 7,341 4,394 387 9,289 5,613 452 11,482 6,975 523 13,910 8,537
30 NA NA NA NA NA NA 78 290 NA 92 483 NA 115 726 449 131 1,029 627 149 1,387 849 170 1,802 1,071 215 2,803 1,663 265 4,037 2,375 319 5,505 3,267 378 7,209 4,279 446 9,136 5,509 514 11,310 6,850 592 13,720 8,391
50 NA NA NA NA NA NA NA NA NA 147 428 NA 180 651 405 197 944 575 217 1,288 787 100 241 1,688 1,000 292 2,657 1,550 350 3,856 2,250 415 5,289 3,100 486 6,956 4,050 572 8,841 5,300 659 10,979 6,600 752 13,354 8,100 102
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.

 

TABLE 504.2(2)
TYPE B DOUBLE-WALL GAS VENT
  Number of Appliances Single
Appliance Type Category 1
Appliance Vent Connection Single-wall metal connector
HEIGHT
(H)
(feet)
LATERAL
(L)
(feet)
VENT DIAMETER–(D) Inches
3 4 5 6 7 8 9 10 12
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 0 38 77 45 59 151 85 85 249 140 126 373 204 165 522 284 211 695 369 267 894 469 371 1,118 569 537 1,639 849
2 39 51 36 60 96 66 85 156 104 123 231 156 159 320 213 201 423 284 251 541 368 347 673 453 498 979 648
4 NA NA 33 74 92 63 102 152 102 146 225 152 187 313 208 237 416 277 295 533 360 409 664 443 584 971 638
6 NA NA 31 83 89 60 114 147 99 163 220 148 207 307 203 263 409 271 327 526 352 449 656 433 638 962 627
8 0 37 83 50 58 164 93 83 273 154 123 412 234 161 580 319 206 777 414 258 1,002 536 360 1,257 658 521 1,852 967
2 39 56 39 59 108 75 83 176 119 121 261 179 155 363 246 197 482 321 246 617 417 339 768 513 486 1,120 743
5 NA NA 37 77 102 69 107 168 114 151 252 171 193 352 235 245 470 31 1 305 604 404 418 754 500 598 1,104 730
8 NA NA 33 90 95 64 122 161 107 175 243 163 223 342 225 280 458 300 344 591 392 470 740 486 665 1,089 715
10 0 37 87 53 57 174 99 82 293 165 120 444 254 158 628 344 202 844 449 253 1,093 584 351 1,373 718 507 2,031 1,057
2 39 61 41 59 117 80 82 193 128 119 287 194 153 400 272 193 531 354 242 681 456 332 849 559 475 1,242 848
5 52 56 39 76 111 76 105 185 122 148 277 186 190 388 261 241 518 344 299 667 443 409 834 544 584 1,224 825
10 NA NA 34 97 100 68 132 171 112 188 261 171 237 369 241 296 497 325 363 643 423 492 808 520 688 1,194 788
15 0 36 93 57 56 190 111 80 325 186 116 499 283 153 713 388 195 966 523 244 1,259 681 336 1,591 838 488 2,374 1,237
2 38 69 47 57 136 93 80 225 149 115 337 224 148 473 314 187 631 413 232 812 543 319 1,015 673 457 1,491 983
5 51 63 44 75 128 86 102 216 140 144 326 217 182 459 298 231 616 400 287 795 526 392 997 657 562 1,469 963
10 NA NA 39 95 116 79 128 201 131 182 308 203 228 438 284 284 592 381 349 768 501 470 966 628 664 1,433 928
15 NA NA NA NA NA 72 158 186 124 220 290 192 272 418 269 334 568 367 404 742 484 540 937 601 750 1,399 894
20 0 35 96 60 54 200 118 78 346 201 114 537 306 149 772 428 190 1,053 573 238 1,379 750 326 1,751 927 473 2,631 1,346
2 37 74 50 56 148 99 78 248 165 113 375 248 144 528 344 182 708 468 227 914 611 309 1,146 754 443 1,689 1,098
5 50 68 47 73 140 94 100 239 158 141 363 239 178 514 334 224 692 457 279 896 596 381 1,126 734 547 1,665 1,074
10 NA NA 41 93 129 86 125 223 146 177 344 224 222 491 316 277 666 437 339 866 570 457 1,092 702 646 1,626 1,037
15 NA NA NA NA NA 80 155 208 136 216 325 210 264 469 301 325 640 419 393 838 549 526 1,060 677 730 1,587 1,005
20 NA NA NA NA NA NA 186 192 126 254 306 196 309 448 285 374 616 400 448 810 526 592 1,028 651 808 1,550 973 103
30 0 34 99 63 53 211 127 76 372 219 110 584 334 144 849 472 184 1,168 647 229 1,542 852 312 1,971 1,056 454 2,996 1,545
2 37 80 56 55 164 111 76 281 183 109 429 279 139 610 392 175 823 533 219 1,069 698 296 1,346 863 424 1,999 1,308
5 49 74 52 72 157 106 98 271 173 136 417 271 171 595 382 215 806 521 269 1,049 684 366 1,324 846 524 1,971 1,283
10 NA NA NA 91 144 98 122 255 168 171 397 257 213 570 367 265 777 501 327 1,017 662 440 1,287 821 620 1,927 1,234
15 NA NA NA 115 131 NA 151 239 157 208 377 242 255 547 349 312 750 481 379 985 638 507 1,251 794 702 1,884 1,205
20 NA NA NA NA NA NA 181 223 NA 246 357 228 298 524 333 360 723 461 433 955 615 570 1,216 768 780 1,841 1,166
30 NA NA NA NA NA NA NA NA NA NA NA NA 389 477 305 461 670 426 541 895 574 704 1,147 720 937 1,759 1,101
50 0 33 99 66 51 213 133 73 394 230 105 629 361 138 928 515 176 1,292 704 220 1,724 948 295 2,223 1,189 428 3,432 1,818
2 36 84 61 53 181 121 73 318 205 104 495 312 133 712 443 168 971 613 209 1,273 811 280 1,615 1,007 401 2,426 1,509
5 48 80 NA 70 174 117 94 308 198 131 482 305 164 696 435 204 953 602 257 1,252 795 347 1,591 991 496 2,396 1,490
10 NA NA NA 89 160 NA 118 292 186 162 461 292 203 671 420 253 923 583 313 1,217 765 418 1,551 963 589 2,347 1,455
15 NA NA NA 112 148 NA 145 275 174 199 441 280 244 646 405 299 894 562 363 1,183 736 481 1,512 934 668 2,299 1,421
20 NA NA NA NA NA NA 176 257 NA 236 420 267 285 622 389 345 866 543 415 1,150 708 544 1,473 906 741 2,251 1,387
30 NA NA NA NA NA NA NA NA NA 315 376 NA 373 573 NA 442 809 502 521 1,086 649 674 1,399 848 892 2,159 1,318
100 0 NA NA NA 49 214 NA 69 403 NA 100 659 395 131 991 555 166 1,404 765 207 1,900 1,033 273 2,479 1,300 395 3,912 2,042
2 NA NA NA 51 192 NA 70 351 NA 98 563 373 125 828 508 158 1,152 698 196 1,532 933 259 1,970 1,168 371 3,021 1,817
5 NA NA NA 67 186 NA 90 342 NA 125 551 366 156 813 501 194 1,134 688 240 1,511 921 322 1,945 1,153 460 2,990 1,796
10 NA NA NA 85 175 NA 113 324 NA 153 532 354 191 789 486 238 1,104 672 293 1,477 902 389 1,905 1,133 547 2,938 1,763
15 NA NA NA 132 162 NA 138 310 NA 188 511 343 230 764 473 281 1,075 656 342 1,443 884 447 1,865 1,110 618 2,888 1,730
20 NA NA NA NA NA NA 168 295 NA 224 487 NA 270 739 458 325 1,046 639 391 1,410 864 507 1,825 1,087 690 2,838 1,696
30 NA NA NA NA NA NA 231 264 NA 301 448 NA 355 685 NA 418 988 NA 491 1,343 824 631 1,747 1,041 834 2,739 1,627
50 NA NA NA NA NA NA NA NA NA NA NA NA 540 584 NA 617 866 NA 711 1,205 NA 895 1,591 NA 1,138 2,547 1,489 104
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.

 

TABLE 504.2(3)
MASONRY CHIMNEY
  Number of Appliances Single
Appliance Type Category 1
Appliance Vent Connection Type B double-wall connector
HEIGHT
(H)
(feet)
LATERAL
(L)
(feet)
TYPE B DOUBLE-WALL CONNECTOR DIAMETER–(D) Inches to be used with chimney areas within the size limits at bottom
3 4 5 6 7 8 9 10 12
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 2 NA NA 28 NA NA 52 NA NA 86 NA NA 130 NA NA 180 NA NA 247 NA NA 320 NA NA 401 NA NA 581
5 NA NA 25 NA NA 49 NA NA 82 NA NA 117 NA NA 165 NA NA 231 NA NA 298 NA NA 376 NA NA 561
8 2 NA NA 29 NA NA 55 NA NA 93 NA NA 145 NA NA 198 NA NA 266 84 590 350 100 728 446 139 1,024 651
5 NA NA 26 NA NA 52 NA NA 88 NA NA 134 NA NA 183 NA NA 247 NA NA 328 149 711 423 201 1,007 640
8 NA NA 24 NA NA 48 NA NA 83 NA NA 127 NA NA 175 NA NA 239 NA NA 318 173 695 410 231 990 623
10 2 NA NA 31 NA NA 61 NA NA 103 NA NA 162 NA NA 221 68 519 298 82 655 388 98 810 491 136 1,144 724
5 NA NA 28 NA NA 57 NA NA 96 NA NA 148 NA NA 204 NA NA 277 124 638 365 146 791 466 196 1,124 712
10 NA NA 25 NA NA 50 NA NA 87 NA NA 139 NA NA 191 NA NA 263 155 610 347 182 762 444 240 1,093 668
15 2 NA NA 35 NA NA 67 NA NA 114 NA NA 179 53 475 250 64 613 336 77 779 441 92 968 562 127 1,376 841
5 NA NA 35 NA NA 62 NA NA 107 NA NA 164 NA NA 231 99 594 313 118 759 416 139 946 533 186 1,352 828
10 NA NA 28 NA NA 55 NA NA 97 NA NA 153 NA NA 216 126 565 296 148 727 394 173 912 567 229 1,315 777
15 NA NA NA NA NA 48 NA NA 89 NA NA 141 NA NA 201 NA NA 281 171 698 375 198 880 485 259 1,280 742
20 2 NA NA 38 NA NA 74 NA NA 124 NA NA 201 51 522 274 61 678 375 73 867 491 87 1,083 627 121 1,548 953
5 NA NA 36 NA NA 68 NA NA 116 NA NA 184 80 503 254 95 658 350 113 845 463 133 1,059 597 179 1,523 933
10 NA NA NA NA NA 60 NA NA 107 NA NA 172 NA NA 237 122 627 332 143 811 440 167 1,022 566 221 1,482 879
15 NA NA NA NA NA NA NA NA 97 NA NA 159 NA NA 220 NA NA 314 165 780 418 191 987 541 251 1,443 840
20 NA NA NA NA NA NA NA NA 83 NA NA 148 NA NA 206 NA NA 296 186 750 397 214 955 513 277 1,406 807 105
30 2 NA NA 41 NA NA 82 NA NA 137 NA NA 216 47 581 303 57 762 421 68 985 558 81 1,240 717 111 1,793 1,112
5 NA NA NA NA NA 76 NA NA 128 NA NA 198 75 561 281 90 741 393 106 962 526 125 1,216 683 169 1,766 1,094
10 NA NA NA NA NA 67 NA NA 115 NA NA 184 NA NA 263 115 709 373 135 927 500 158 1,176 648 210 1,721 1,025
15 NA NA NA NA NA NA NA NA 107 NA NA 171 NA NA 243 NA NA 353 156 893 476 181 1,139 621 239 1,679 981
20 NA NA NA NA NA NA NA NA 91 NA NA 159 NA NA 227 NA NA 332 176 860 450 203 1,103 592 264 1,638 940
30 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 188 NA NA 288 NA NA 416 249 1,035 555 318 1,560 877
50 2 NA NA NA NA NA 92 NA NA 161 NA NA 251 NA NA 351 51 840 477 61 1,106 633 72 1,413 812 99 2,080 1,243
5 NA NA NA NA NA NA NA NA 151 NA NA 230 NA NA 323 83 819 445 98 1,083 596 116 1,387 774 155 2,052 1,225
10 NA NA NA NA NA NA NA NA 138 NA NA 215 NA NA 304 NA NA 424 126 1,047 567 147 1,347 733 195 2,006 1,147
15 NA NA NA NA NA NA NA NA 127 NA NA 199 NA NA 282 NA NA 400 146 1,010 539 170 1,307 702 222 1,961 1,099
20 NA NA NA NA NA NA NA NA NA NA NA 185 NA NA 264 NA NA 376 165 977 511 190 1,269 669 246 1,916 1,050
30 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 327 NA NA 468 233 1,196 623 295 1,832 984
Minimum Internal Area of Chimney (square inches) 12 19 28 38 50 63 78 95 132
Maximum Internal Area of Chimney (square inches) Seven times the listed appliance categorized vent area, flue collar area or draft hood outlet area.
For SI: 1 inch = 25.4 mm. 1 square inch = 645.16 mm2, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 106

 

TABLE 504.2(4)
MASONRY CHIMNEY
  Number of Appliances Single
Appliance Type Category 1
Appliance Vent Connection Single-wall metal connector
HEIGHT (H) (feet) LATERAL (L) (feet) SINGLE-WALL METAL CONNECTOR DIAMETER—(D) Inches to be used with chimney areas within the size limits at bottom
3 4 5 6 7 8 9 10 12
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 2 NA NA 28 NA NA 52 NA NA 86 NA NA 130 NA NA 180 NA NA 247 NA NA 319 NA NA 400 NA NA 580
5 NA NA 25 NA NA 48 NA NA 81 NA NA 116 NA NA 164 NA NA 230 NA NA 297 NA NA 375 NA NA 560
8 2 NA NA 29 NA NA 55 NA NA 93 NA NA 145 NA NA 197 NA NA 265 NA NA 349 382 725 445 549 1,021 650
5 NA NA 26 NA NA 51 NA NA 87 NA NA 133 NA NA 182 NA NA 246 NA NA 327 NA NA 422 673 1,003 638
8 NA NA 23 NA NA 47 NA NA 82 NA NA 126 NA NA 174 NA NA 237 NA NA 317 NA NA 408 747 985 621
10 2 NA NA 31 NA NA 61 NA NA 102 NA NA 161 NA NA 220 216 518 297 271 654 387 373 808 490 536 1,142 722
5 NA NA 28 NA NA 56 NA NA 95 NA NA 147 NA NA 203 NA NA 276 334 635 364 459 789 465 657 1,12! 710
10 NA NA 24 NA NA 49 NA NA 86 NA NA 137 NA NA 189 NA NA 261 NA NA 345 547 758 441 771 1,088 665
15 2 NA NA 35 NA NA 67 NA NA 113 NA NA 178 166 473 249 211 611 335 264 776 440 362 965 560 520 1,373 840
5 NA NA 32 NA NA 61 NA NA 106 NA NA 163 NA NA 230 261 591 312 325 775 414 444 942 531 637 1,348 825
10 NA NA 27 NA NA 54 NA NA 96 NA NA 151 NA NA 214 NA NA 294 392 722 392 531 907 504 749 1,309 774
15 NA NA NA NA NA 46 NA NA 87 NA NA 138 NA NA 198 NA NA 278 452 692 372 606 873 481 841 1,272 738
20 2 NA NA 38 NA NA 73 NA NA 123 NA NA 200 163 520 273 206 675 374 258 864 490 252 1,079 625 508 1,544 950
5 NA NA 35 NA NA 67 NA NA 115 NA NA 183 80 NA 252 255 655 348 317 842 461 433 1,055 594 623 1,518 930
10 NA NA NA NA NA 59 NA NA 105 NA NA 170 NA NA 235 312 622 330 382 806 437 517 1,016 562 733 1,475 875
15 NA NA NA NA NA NA NA NA 95 NA NA 156 NA NA 217 NA NA 311 442 773 414 591 979 539 823 1,434 835
20 NA NA NA NA NA NA NA NA 80 NA NA 144 NA NA 202 NA NA 292 NA NA 392 663 944 510 911 1,394 800 107
30 2 NA NA 41 NA NA 81 NA NA 136 NA NA 215 158 578 302 200 759 420 249 982 556 340 1,237 715 489 1,789 1,110
5 NA NA NA NA NA 75 NA NA 127 NA NA 196 NA NA 279 245 737 391 306 958 524 417 1,210 680 600 1,760 1,090
10 NA NA NA NA NA 66 NA NA 113 NA NA 182 NA NA 260 300 703 370 370 920 496 500 1,168 644 708 1,713 1,020
15 NA NA NA NA NA NA NA NA 105 NA NA 168 NA NA 240 NA NA 349 428 884 471 572 1,128 615 798 1,668 975
20 NA NA NA NA NA NA NA NA 88 NA NA 155 NA NA 223 NA NA 327 NA NA 445 643 1,089 585 883 1,624 932
30 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 182 NA NA 281 NA NA 408 NA NA 544 1,055 1,539 865
50 2 NA NA NA NA NA 91 NA NA 160 NA NA 250 NA NA 350 191 837 475 238 1,103 631 323 1,408 810 463 2,076 1,240
5 NA NA NA NA NA NA NA NA 149 NA NA 228 NA NA 321 NA NA 442 293 1,078 593 398 1,381 770 571 2,044 1,220
10 NA NA NA NA NA NA NA NA 136 NA NA 212 NA NA 301 NA NA 420 355 1,038 562 447 1,337 728 674 1,994 1,140
15 NA NA NA NA NA NA NA NA 124 NA NA 195 NA NA 278 NA NA 395 NA NA 533 546 1,294 695 761 1,945 1,090
20 NA NA NA NA NA NA NA NA NA NA NA 180 NA NA 258 NA NA 370 NA NA 504 616 1,251 660 844 1,898 1,040
30 NA NA NA NA NA 48 NA NA NA NA NA NA NA NA NA NA NA 318 NA NA 458 NA NA 610 1,009 1,805 970
Minimum Internal Area of Chimney (square inches) 12 19 28 38 50 63 78 95 132
Maximum Internal Area of Chimney (square inches) Seven times the listed appliance categorized vent area, flue collar area or draft hood outlet area.
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 108

 

TABLE 504.2(5)
SINGLE-WALL METAL PIPE OR TYPE B ASBESTOS CEMENT VENT
  Number of Appliances Single
Appliance Type Draft hood equipped
Appliance Vent Connection Connected directly to pipe or vent
HEIGHT (H) (feet) LATERAL (L) (feet) VENT DIAMETER—(D) inches
3 4 5 6 7 8 10 12
MAXIMUM APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
6 0 39 70 116 170 232 312 500 750
2 31 55 94 141 194 260 415 620
5 28 51 88 128 177 242 390 600
8 0 42 76 126 185 252 340 542 815
2 32 61 102 154 210 284 451 680
5 29 56 95 141 194 264 430 648
10 24 49 86 131 180 250 406 625
10 0 45 84 138 202 279 372 606 912
2 35 67 111 168 233 311 505