1、AN AM E R IC AN NAT IO NAL STANDARDASME B16.40-2019(Revision of ASME B16.40-2013)Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution SystemsASME B16.40-2019(Revision of ASME B16.40-2013)Manually OperatedThermoplastic Gas Shutoffsand Valves in GasDistribution SystemsAN AMERICA
2、N NATIONAL STANDARDxDate of Issuance:February 11,2019The next edition of this Standard is scheduled for publication in 2024.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Periodically certainactionsoftheASMEB16CommitteemaybepublishedasCases.
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9、affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand policies,which precludes the issuance of interpreta
10、tions by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2019 byTHE AMERICAN SOCIETY OF
11、MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viSummary of Changes.viiiList of Changes in Record Number Order.ix1Scope.12Construction.23Configuration.24Pressure Rating.25Marking.26Production and Qualification Testin
12、g.3Mandatory AppendicesIValve Design Pressure.7IIReferences.8Nonmandatory AppendixAQuality System Program.9Tables6.2.1-1Duration of Test.46.3.1-1Maximum Operating Torque Values.56.3.3-1Sustained Test Pressures and Minimum Durations.56.3.4-1Flow and Head Loss Coefficients.6iiiFOREWORDTheB16StandardsC
13、ommitteewasorganizedinthespringof1920andhelditsorganizationalmeetingonNovember21of that year.The group operated as a Sectional Committee(later redesignated as a Standards Committee)under theauthorizationoftheAmericanEngineeringStandardsCommitteesubsequentlynamedAmericanStandardsAssociation,United St
14、ates of America Standards Institute,and now American National Standards Institute(ANSI).Sponsors for thegroup were the American Society of Mechanical Engineers(ASME),Manufacturers Standardization Society of the Valveand Fittings Industry,and the Heating and Piping Contractors National Association(la
15、ter the Mechanical ContractorsAssociation of America).TheAmericanGasAssociation(A.G.A.)determinedthatstandardizationofgasvalvesusedindistributionsystemswasdesirable and needed.The A.G.A.Task Committee on Standards for Valves and Shutoffs was formed,and developmentwork commenced in 1958.In 1968,it wa
16、s determined that a more acceptable document would result if approval weregainedfromANSI,andtofacilitatesuchaction,theA.G.A.CommitteebecameSubcommitteeNo.13oftheB16activity.ThisB16 group was later renamed Subcommittee L,which is its current designation.The first standard developed by Subcommittee L was ANSI B16.33.The ANSI B16.38 standard was subsequentlydeveloped to cover larger sizes of gas valves and shutoffs.Sinceabout1965,theincreaseduseofplasticpipingingasdistributionsystemsbroughtwithitth
