NFPA 54 ANSI Z223.1-2021 美国燃气规范.pdf

Copyright 2020 National Fire Protection Association and the American Gas Association.All Rights Reserved.NFPA 54 ANSI Z223.l-2021 National Fuel Gas Code 2021 Edition This edition ofNFPA 54/ANSI Z223.l,National Fuel Gas Code,wa5 prepared by the Technical Committee on National Fuel Gas Code.It was issued by the Standards Council on March 15,2020,with an effective date of April 4,2020,and supersedes all previous editions.This edition of NFPA 54/ANSI Z223.l was approved as an American National Standard on April 4,2020.The ANSI designation,Z223.1-2021,was approved on April 2,2020.The NFPA designation is NFPA 54-2021.Origin and Development of NFPA 54/ANSI Z223.1 This code offers criteria for the installation and operation of gas piping and gas equipment on consumers p1emises.It is the cumulative result of years of experience of many individuals and many organizations acquainted with the installation of gas piping and equipment designed for utilization of gaseous fuels.It is intended to promote public safety by providing requirements for the safe and satisfactory uti.lization of ga.Changes in this code can become necessary from time to time.vVhen any revision is deemed advisable,recommendations should be forwarded to the Secretary,Accredited Standards Committee Z223,400 N.Capitol St.NW,Washington,DC 20001,and the Secretary,Standa1-ds Council,National Fire Protection Association,1 Batterymarch Park,Quincy,MA 02169-7471.Prior to 1974,the following three codes covered the installation of gas piping and appliances:(1)American National Standard Installation of Gas Appliances and Gas Piping,ANSI Z21.30(NFPA 54)(2)Installation of Gas Piping and Gas Equipment on lndust1ial Premises and Certain Other Premises,ANSI Z83.l(NFPA54A)(3)Fuel Gas Piping,ASME B31.2 The first edition of the code was issued in 1974.It combined the requirements of the three predecessor documents.The American Gas Association and the National Fire Protection Association have continued co-sponsorship of the code following the first edition.The second edition of the code,incorporating pertinent portions of B31.2,was issued in 1980 and 1eorganized the code to the current fonnat.Subsequent editions were issued in 1984,1988,1992,1996,1999,and 2002,respectively.The scope of the code was expanded in 1988 to include piping systems up to and including 125 psi(862 kPa).Revision highlights from subsequent editions include the following:The 2006 edition incorporated expanded steel,copper,and polyethylene pipe sizing tables.Requirements for appliance shutoff valves were revised to allow manifold systems with all shutoff valves in one location up to 50 ft(15 m)from the most remote appliance,and the chapters were reorganized by application.The 2009 edition included allowing press-connect fittings for gas tubing systems,new 1equirements for bonding of CSST piping systems,expanded CSST sizing tables to recognize additional available sizes,new coverage of outdoor decorative appliances,and a new requirement to seal the annular space around the side wall vent penetrations.The 2012 edition included revised fuel gas piping pmging procedures that requi1e outdom-purging of piping with larger pipe sizes or higher operating pressures and allows smaller or lower operating pressure piping to be purged indoors under specific conditions.NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association,Quincy,Massachusetts 02169.54-1 54-2 NATIONAL FUEL GAS CODE The 2015 edition revised the bonding requirements for CSST so that the bonding connection can be placed on any metallic fitting in the piping system as long as the bonding jumper does not exceed 75 ft(22 m)in length.Overpressure protection requirements were revritten and overpressure protection is required on any system containing an appliance with a maximum inlet pressure of 14 in.w.c.(3.5 kPa)that is supplied with gas at the point of delivery at a pressure greater than 2 psig(14 kPa).Annex G,Recommended Procedure for Safety Inspection of an Existing Appliance Installation,was expanded and revised to reflect modern appliances and test methods.In the 2018 edition,revisions to piping included allowing listed arc-resistant jacket or coated CSST to use the appliances electrical grounding connector as the bonding means and recognizing stainless steel smooth wall pipe and tubing products as acceptable piping materials.The minimum allowed wall thickness of carbon and stainless steel pipe was revised to Schedule 10,but joints on Schedule 10 pipe cannot be ma.de with screwed fittings.Press-connect fittings were added as an acceptable joining method for pipe.Revisions to the venting requirements included requiring listing to the appropriate UL standards for plastic venting materials,factory-built chimneys,Type Band 8.V vents,chimney lining systems,and special gas vent.Direct vent clearances to building openings for appliances with an input above 150,000 Btu(44 kW)a.re to be in accordance with the appliance manufacturers installation instructions.Finally,in Chapter 9 a requirement was added that an existing gas appliance installation be inspected for combustion air and venting code compliance when the building structure that it is installed in is modified with specific air infiltration-reducing changes.The 2021 edition includes revisions in Chapter 10 that now require appliances to be listed to and in compliance with the a.pprop1-iate ANSI/CSA appliance listing standard,thereby providing an increased level of safety.Installation requirements for unlisted appliances have been removed,and they will now have to be evaluated through the application of equivalency.A table for through the wall vent terminal clearances has been added to Chapter 12,along with an associated annex figure that coordinates this code with the clearances in ANSI product standards.Engineering methods a1-e now defined in Chapter 4 to provide guidance to authorities having jurisdiction on acceptable engineering methods that/ill eliminate the need to approve individually all engineering methods used.Finally,electric isolation requirements for gas piping installation have been revised and reorganized to better reflect where the dielectric union is to be installed in the system and what it is protecting.2021 Edition COMMITIEE PERSONNEL Technical Committee on National Fuel Gas Code Joint Listing of NFPA 54 and ASC Z223 Committee Frank J.Mortimer,Chair EMC Insurance Company,lA I/I Rep.Property Casualty Insurers Association of America Paul W.Cabot,Nonvoting Secretary American Gas Association,DC JM Rep.American Gas Association Dmitry Antonov,lntertek,NY RT/AR-TL Eric Adiart,Hearth,Patio&Barbecue Association,VA M Thomas Andrews,Michigan Technical Education Center,Ml SE/SE David Berningt,Product Design Engineering,SC M JonathanBrania,ULLLC,NC RT/AR-TL James P.Brewer,Magic Sweep Corporation,VA IM/1-M Rep.National Chimney Sweep Guild Chris Dale Byers,Piedmont Natural Gas,SC U/ES Thomas R.Crane,Crane Engineering,MN SE/SE Gerald G.Davis*,Williams Meter Company,MD IM Mike Deegan,Clearwater Gas System,FL U/ES Rep.American Public Gas Association Mark Fasel,Viega LLC,IN M/M Alberto Jose Fossa*,NEWEN Creative Engineering,Brazil SE Rep.NFPA Latin American Section Richard L.Gilbert*,Texas Propane Gas Association,TX IM Enrique Trejo Gonzalez,International Association of Plumbing&Mechanical Officials(lAPMO),CA E/EA Rep.International Association of Pltm1bing&Mechanical Officials Mike Gorham,Northwest Gas Company,MN lM/ES Rep.National Propane Gas Association Gregg A Gress,International Code Council,LL E/EA Roger W.Griffith*,Griffith Engineering,TN U Steen Hagensen,ENERVEX,GA M/M William T.Hamilton*,UGI Utilities Inc.,PA IM Rep.American Gas Association PeterT.Holmes*,Maine Fuel Board,ME E DianeJakobs,Rheem,AR M/M Rep.Air-Conditioning,Heating,&Refrigeration lnstinne James Kendzel*,American Supply Association,IL U Jeff Kleiss,Lochinva1 TN M/M Rep.Air-Conditioning,Heating,&Refrigeration Institute Vladimir Kochkint,National A%ociation of Home Builders,DC 1-M Marek Kulik*,Technical Standards and Safety Authority,Canada E Theodore C.Lemoff,Naples,FL SE/SE Timothy McNulty*,RM Manifold Group Inc.,dba US Draft Company,TX M WilliamJ Murray*,Corning Incorporated,NY U Tung Nguyen*,Emerson Automation Solution,TX M Andrea Lanier Papageorge,Southern Company Gas,GA JM/ES Rep.American Gas Association Dale L.Powell,Copper Development Association,Inc.,PA M/M Rep.Copper Development Association Inc.Phillip H.Ribbs*,PHR Consultants,CA L Rep.California State Pipe Trades Council April Dawn Richardson,Railroad Commission of Texas,TX E/EA Brian Rygiewicz*,Chimney Design Solutions Inc.,NJ M Eric C.Smith,State of Nevada,NV E/EA Rep.International Fire Marshals Association Jason Stanek,Metropolitan Utilities District(MUD),NE IM/ES Rep.American Gas Association Peter C.Swim*,Whirlpool Corporation,Ml M Franklin R.Switzer,Jr.,S-afe,Inc.,NY SE/SE Mathew Williamst,Association of Home Appliance Manufacturers,DC M Alternates Hugo Aguilar,International Association of Plumbing&Mechanical Officials(lAPMO),CA E/EA(AlL to Enrique Trejo Gonzalez)Jeremy R.Conjura*,Corning Incorporated,NY U(AIL to William.J Murray)Kody N.Daniel,EMC Insurance Companies,LA I/I(AIL to FrankJ.Mortimer)John P.Doucette,State of CT Department of Administrative Services,CT E/EA(AIL to Peter T.Holmes)Craig Drumhellert,National Association of Home Builders,DC(1-M(Alt.to Vladimir Koch kin)Ralph Euchner,PSNC Energy,NC JM/ES(AIL to Andrea Lanier Papageorge)Pennie L.Feehan,Pennie L.Feehan Consulting,CA M/M(Alt.to Dale L.Powell)Fred Grable,International Code Council,L L E/EA(Alt.to Gregg A.Gress)Paul Gugliottat,National Grid,NY ES(Alt.to Jason Stanek)Travis F.Hardin*,UL LLC,NC RT(Alt.to Jonathan Brania)John Kory,CSA America,Inc.,OH RT/AR-TL(Voting Alt.)DonaldJ.MacBride,Dominion East Ohio Gas,OH JM/ES(Alt.to William T.Hamilton)Jean L.McDowell*,McDowell Owens Engineering Inc.,TX IM(Alt.to Richard L.Gilbert)John R.Puskar,Prescient Technical Services LLC,OH SE/SE(Alt.to Theodore C.Lemoff)Phillip W.Stephens,Weil Mclain,IN M/M(Alt.to Jeff Kleiss)BruceJ.Swiecicki,National Propane Gas Association,LL IM/ES(Alt.to Mike Gorham)54-3 2021 Edition 54-4 NATIONAL FUEL GAS CODE Andy john Thielen,Crane Engineering,MN SE/SE(AJL to Thomas R.Crane)Robert Torbin,Omega Flex,Inc.,MA M/M(Alt.to Dianej akobs)Kent Lowery Thompson*,Railroad Commission ofTexas,TX E(AJL to April Dawn Richardson)Alex Ing,NFPA Staff Liaison 2021 Edition*NFPA 54 Committee only.t Z223 Committee only.NFPA Interest Category/ASC Z223 Interest Category This list rejmsenls the membership al the lime the Commillee was balloted on lhefinal/xl of this edition.Since lhat time,changes in the membershijJ nwy have occurred.A key to classifications is found at the back of/he document.NOTE:Membership on a committee shall not in and of itself constitute an endorsement of the Association or any document developed by the committee on which the member serves.The National Fuel Gas Code Committee is a committee functioning jointly under American National Standards Institute Accredited Standard Committee Z223 procedures and the National Fire Protection Association and,accordingly,tl1e National Fuel Gas Code bears two designations,ANSI Z223.l and NFPA 54.In the ANSI context,the code is prepared by the Accredited Standards Committee on National Fuel Gas Code,Z223,sponsored by tl1e American Gas Association(Administrative Secretariat).In the NFPA context,the committee is an NFPA Technical Committee submitted to ANSI under NFPA audited designation.Committee Scope:This Committee shall have primary responsibility for documents on safety code for gas piping systems on consumers premises and the installation of gas utilization equipment and accessories for use with fuel gases such as natural gas,manufactured gas,liquefied petroleum gas in the vapor phase,liquefied petroleum gas-air mixtures,or mixtures of these gases,including:a.The design,fabrication,installation,testing,operation,and maintenance of gas piping systems from the point of delivery to tl1e connections with each gas utilization device.Piping systems covered by this Code are limited to a maximum operating pressure of 125 psig.For purposes of this Code,tl1e point of delivery is defined as tl1e outlet of the meter set assembly,or the outlet of the service regulator or ser.ice shutoff valve where no meter is provided.b.The installation of gas utilization equipment,related accessories,and their ventilation and venting systems.Chapter 1 Administration.I.I Scope.1.2 Purpose.1.3 Retroactivity.1.4 Equivalency.1.5 Enforcement.Chapter 2 Referenced Publications.2.1 General.2.2 NFPA Publications.2.3 Other Publications.2.4 References for Extracts in Mandatory Sections.Chapter 3 Definitions.3.1 General.3.2 NFPA Official Definitions.3.3 General Definitions.Chapter 4 General.4.1 Qualified Agency.4.2 Interruption of Service.4.3 Prevention of Accidental Ignition.4.4 Noncombustible Material.4.5 Engineering Methods.Chapter 5 Gas Piping System Design,Materials,and Components.5.1 Piping Plan.5.2 Interconnections Between Gas Piping Systems.5.3 Sizing of Gas Piping Systems.5.4 Operating Pressure.5.5 Piping Materials and Joining Methods.5.6 Gas Meters.5.7 Gas Pressure Regulators.5.8 Overpressure Protection Devices.5.9 Back Pressure Protection.5.10 Low-Pressure Protection.5.11 Shutoff Valves.5.12 Excess FlowValve(s).5.13 Expansion and Flexibility.5.14 Pressure Regulator and Pressure Control Venting.Chapter 6 Pipe Sizing.6.L Pipe Sizing Methods.6.2 Sizing Natural Gas Piping Systems.6.3 Sizing Propane Piping Systems.6.4 Sizing Equations.Chapter 7 Gas Piping Installation.7.L Installation of Underground Piping.7.2 Installation of Aboveground Piping.7.3 Concealed Piping in Buildings.7.4 Piping in Vertical Chases.7.5 Gas Pipe Turns.7.6 Drips and Sediment Traps.7.7 Outlets.7.8 Manual Gas Shutoff Valves.7.9 Prohibited Devices.7.10 Systems Containing Gas-Air Mixrures Outside tl1e Flammable Range.7.11 Systems Containing Flammable Gas-Air Mixrures.7.12 Electrical Bonding and Grounding.7.13 Electrical Circuits.7.14 Electrical Connections.CONTENTS 54-7 54-7 54-7 54-8 54-8 54-8 54-8 54-8 54-8 54-8 54-10 54-10 54-10 54-10 54-10 54-17 54-17 54-17 54-17 54-18 54-18 54-18 54-18 54-18 54-18 54-18 54-19 54-21 54-22 54-22 54-23 54-23 54-23 54-23 54-23 54-23 54-24 54-24 54-24 54-24 54-24 54-62 54-62 54-63 54-64 54-64 54-64 54-65 54-65 54-65 54-65 54-65 54-65 54-66 54-67 54-67 Contents Chapter 8 Inspection,Testing,and Purging.8.1 Pressure Testing and Inspection.8.2 Piping System Leak Check.8.3 Purging Requirements.Chapter 9 Appliance,Equipment,and Accessory Installation.9.1 General.9.2 Accessibility and Clearance.9.3 Air for Combustion and Ventilation.9.4 Appliances on Roofs.9.5 Appliances in Attics.9.6 Appliance and Equipment Connections to Building Piping.9.7 Electrical.9.8 Room Temperature Thermostats.Chapter 10.l 10.2 10.3 10.4 10 Installation of Specific Appliances.General.Air-Conditio