1、 2015CODE AND COMMENTARYThe complete IFGC with commentary after each sectionIFGC2015 International Fuel Gas CodeCommentaryFirst Printing: May 2015ISBN: 978-1-6083-292-6COPYRIGHT 2015byINTERNATIONAL CODE COUNCIL, INC.ALL RIGHTS RESERVED. This 2015 International Fuel Gas CodeCommentary is a copyrighte
2、d work owned by the Inter-national Code Council, Inc. Without advance written permission from the copyright owner, no part of this book may be repro-duced, distributed, or transmitted in any form or by any means, including, without limitation, electronic, optical or mechanicalmeans (by way of exampl
3、e, and not limitation, photocopying, or recording by or in an information storage retrieval system). Forinformation on permission to copy material exceeding fair use, please contact: Publications, 4051 Flossmoor Road, CountryClub Hills, IL 60478. Phone 1-888-ICC-SAFE (422-7233). Trademarks: “Interna
4、tional Code Council,” the “International Code Council” logo and the “International Fuel Gas Code” aretrademarks of the International Code Council, Inc. Material designated IFGSbyAMERICAN GAS ASSOCIATION400 N. Capitol Street, N.W. Washington, DC 20001(202) 824-7000Copyright American Gas Association,
5、2009. All rights reserved.PRINTED IN THE U.S.A.2015 INTERNATIONAL FUEL GAS CODECOMMENTARY iiiPREFACEThe principal purpose of the Commentary is to provide a basic volume of knowledge and facts relating to building constructionas it pertains to the regulations set forth in the 2015 International Fuel
6、Gas Code(IFGC). The person who is serious abouteffectively designing, constructing and regulating buildings and structures will find the Commentary to be a reliable data sourceand reference to almost all fuel gas components of the built environment.As a follow-up to the International Fuel Gas Code,
7、we offer a companion document, the International Fuel Gas Code Com-mentary. The basic appeal of the Commentary is that it provides in a small package and at reasonable cost thorough coverage ofmany issues likely to be dealt with when using the International Fuel Gas Code. It then supplements that co
8、verage with histori-cal and technical background. Reference lists, information sources and bibliographies are also included.Throughout all of this, strenuous effort has been made to keep the vast quantity of material accessible and its method of pre-sentation useful. With a comprehensive yet concise
9、 summary of each section, the Commentary provides a convenient referencefor regulations applicable to the construction of buildings and structures. In the chapters that follow, discussions focus on the fullmeaning and implications of the code text. Guidelines suggest the most effective method of app
10、lication, and the consequences ofnot adhering to the code text. Illustrations are provided to aid understanding; they do not necessarily illustrate the only methodsof achieving code compliance.The format of the Commentary includes the full text of each section, table and figure in the code, followed
11、 immediately by thecommentary applicable to that text. At the time of printing, the Commentary reflects the most up-to-date text of the 2015 Inter-national Fuel Gas Code. Each chapters narrative includes a section on “General Comments” and “Purpose,” and each sectionsnarrative usually includes a dis
12、cussion about why the requirement commands the conditions set forth. Code text is reproduced asit appears in the International Fuel Gas Code, and commentary is indented below the code text, beginning with the symbol .Code figures and tables are reproduced as they appear in the International Fuel Gas
13、 Code. Commentary figures and tables areidentified in the text by the word “Commentary” (as in “see Commentary Figure 704.3”), and each has a full border.The International Fuel Gas Code is segregated by section numbers into two categories: code and standard. Code sections areidentified as IFGC; stan
14、dard sections are identified as IFGS.Commentary is to be used in conjunction with the International Fuel Gas Code and not as a substitute for the code. The Com-mentary is advisory only; the code official alone possesses the authority and responsibility for interpreting the code.Comments and recommen
15、dations are encouraged, for through your input, we can improve future editions. Please direct yourcomments to the Codes and Standards Development Department at the Chicago District Office.iv 2015 INTERNATIONAL FUEL GAS CODECOMMENTARY2015 INTERNATIONAL FUEL GAS CODECOMMENTARY vTABLE OF CONTENTSCHAPTE
16、R 1 SCOPE AND ADMINISTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-20PART 1SCOPE AND APPLICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1PAR
17、T 2ADMINISTRATION AND ENFORCEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2
18、-28CHAPTER 3 GENERAL REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3-60CHAPTER 4 GAS PIPING INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4-114CHA
19、PTER 5 CHIMNEYS AND VENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5-100CHAPTER 6 SPECIFIC APPLIANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-
20、44CHAPTER 7 GASEOUS HYDROGENSYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7-12CHAPTER 8 REFERENCED STANDARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . . 8-1 8-6APPENDIX A SIZING AND CAPACITIES OF GAS PIPING (IFGS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 A-10APPENDIX B SIZING OF VENTING SYSTEMS SERVING APPLIANCESEQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES AND APPLIANCES LISTED FOR USE WITH
22、 TYPE B VENTS (IFGS) . . . . . . . . . . . . . . . . . . . . . . B-1 B-10APPENDIX C EXIT TERMINALS OF MECHANICAL DRAFT ANDDIRECT-VENT VENTING SYSTEMS (IFGS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 C-2APPENDIX D RECOMMENDED PROCEDURE FOR SAFETY INSPECTION O
23、FAN EXISTING APPLIANCE INSTALLATION (IFGS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 D-6INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX-1 INDEX-4vi 2015 I
24、NTERNATIONAL FUEL GAS CODECOMMENTARY 2015 INTERNATIONAL FUEL GAS CODECOMMENTARY 1-1PART 1SCOPE AND APPLICATIONSECTION 101 (IFGC)GENERALA 101.1 Title. These regulations shall be known as the FuelGas Code of NAME OF JURISDICTION, hereinafter referred toas “this code.”This section identifies the adopte
25、d regulations byinserting the name of the adopting jurisdiction into thecode.A 101.2 Scope. This code shall apply to the installation offuel-gas piping systems, fuel gas appliances, gaseous hydro-gen systems and related accessories in accordance with Sec-tions 101.2.1 through 101.2.5.Exception: Deta
26、ched one- and two-family dwellings andmultiple single-family dwellings (townhouses) not morethan three stories high with separate means of egress andtheir accessory structures shall comply with the Interna-tional Residential Code.This section describes the types of fuel gas systemsto which the code
27、is intended to apply and specificallylists those systems to which the code does not apply.The applicability of the code spans from the initialdesign of fuel gas systems, through the installationChapter 1:Scope and AdministrationGeneral CommentsThe law of building regulation is grounded on the police
28、power of the state. It is used so that the state may legis-late for the general welfare of its citizens. This powerenables passage of such laws as a fuel gas code. It isfrom the police power delegated by the state legislaturethat local governments are able to enact building regula-tions. If the stat
29、e legislature has limited this power inany way, the municipality may not exceed these limita-tions. Although the municipality may not further dele-gate its police power (e.g., by delegating the burden ofdetermining code compliance with the building owner,contractor or architect), it may turn over th
30、e administra-tion of building regulations to a municipal official, suchas a code official, if he or she is given sufficient criteriato clearly establish the basis for decisions concerningwhether or not a proposed building, including its fuelgas systems, conforms to the code.Chapter 1 is largely conc
31、erned with maintaining “dueprocess of law” in enforcing the performance criteriacontained in the code. Only through careful observationof the administrative provisions can the code official rea-sonably hope to demonstrate that “equal protectionunder the law” has been established. Although it is gen-
32、erally assumed that the administrative and enforcementsections of a code are geared toward the code official,this is not entirely true. The provisions also establish therights and privileges of the registered design profes-sional, the contractor and the building owner. The posi-tion of the code offi
33、cial is merely to review the proposedand completed work and determine whether a fuel gasinstallation conforms to the code requirements. The reg-istered design professional is responsible for the designof a safe, sanitary fuel gas system. The contractor isresponsible for installing the system in stri
34、ct accordancewith the plans.During the course of the construction of a fuel gassystem, the code official reviews the activity to verifythat the spirit and intent of the law are being met andthat the fuel gas system provides adequate protection ofpublic health. As a public servant, the code officiale
35、nforces the code without bias. Every individual is guar-anteed equal enforcement of the code. Furthermore,design professionals, contractors and building ownershave the right of due process for any requirement in thecode.PurposeA fuel gas code, like any other code, is intended to beadopted as a legal
36、ly enforceable document to safe-guard health, safety, property and public welfare. A fuelgas code cannot be effective without adequate provi-sions for its administration and enforcement. The officialcharged with the administration and enforcement of fuelgas regulations has a great responsibility, an
37、d with thisresponsibility goes authority. No matter how detailed thefuel gas code may be, the code official must, to someextent, exercise judgment in determining compliance.The code official has the responsibility of establishingthat the homes in which the citizens of the communityreside and the bui
38、ldings in which they work aredesigned and constructed to be reasonably free fromhazards associated with the presence and use of fuelgas appliances, appurtenances, fixtures and systems.The code intends to establish a minimum acceptablelevel of safety.SCOPE AND ADMINISTRATION1-2 2015 INTERNATIONAL FUE
39、L GAS CODECOMMENTARYand construction phases, and into the maintenance ofoperating systems. Chapter 24 of the InternationalResidential Code(IRC) covers fuel gas systemsand is a duplication of the applicable InternationalFuel Gas Code(IFGC) text.A 101.2.1 Gaseous hydrogen systems. Gaseous hydrogensyst
40、ems shall be regulated by Chapter 7.See the general comments for Chapter 7.A 101.2.2 Piping systems. These regulations cover pipingsystems for natural gas with an operating pressure of 125pounds per square inch gauge (psig) (862 kPa gauge) or less,and for LP-gas with an operating pressure of 20 psig
41、 (140 kPagauge) or less, except as provided in Section 402.6. Coverageshall extend from the point of delivery to the outlet of theappliance shutoff valves. Piping system requirements shallinclude design, materials, components, fabrication, assembly,installation, testing, inspection, operation and ma
42、intenance.The code does not limit the operating pressure ofsystems, but rather limits the codes coverage of pip-ing systems to those having pressures less than orequal to the stated pressures. Consistent with thedefinition, piping systems begin at the point of deliv-ery and end at the outlet of the
43、appliance shutoffvalves (see Section 101.2.3 and definition of “Pipingsystem”).A 101.2.3 Gas appliances. Requirements for gas appli-ances and related accessories shall include installation, com-bustion and ventilation air and venting and connections topiping systems.The piping and connectors between
44、 the applianceshutoff valves and the appliance served are coveredby the code, although the piping and connectors areoutside the scope of the definition of “Piping system.”A 101.2.4 Systems, appliances and equipment outsidethe scope. This code shall not apply to the following:1. Portable LP-gas appli
45、ances and equipment of all typesthat is not connected to a fixed fuel piping system.2. Installation of farm appliances and equipment such asbrooders, dehydrators, dryers and irrigation equip-ment.3. Raw material (feedstock) applications except for pip-ing to special atmosphere generators.4. Oxygen-f
46、uel gas cutting and welding systems.5. Industrial gas applications using gases such as acety-lene and acetylenic compounds, hydrogen, ammonia,carbon monoxide, oxygen and nitrogen.6. Petroleum refineries, pipeline compressor or pumpingstations, loading terminals, compounding plants,refinery tank farm
47、s and natural gas processing plants.7. Integrated chemical plants or portions of such plantswhere flammable or combustible liquids or gases areproduced 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
48、 power and atomic energy plants.11. Proprietary items of equipment, apparatus or instru-ments such as gas-generating sets, compressors andcalorimeters.12. LP-gas equipment for vaporization, gas mixing andgas manufacturing.13. Temporary LP-gas piping for buildings under con-struction or renovation th
49、at is not to become part ofthe permanent piping system.14. Installation of LP-gas systems for railroad switchheating.15. Installation of hydrogen gas, LP-gas and compressednatural gas (CNG) systems on vehicles.16. Except as provided in Section 401.1.1, gas piping,meters, gas pressure regulators and other appurte-nances used by the serving gas supplier in the distr
