6-38_2012.pdf

AN AMERICAN NATIONAL STANDARD ASME B16.38-2012(Revision of ASME B16.38-2007)Large Metallic Valves for Gas DistributionManually Operated,NPS 2 (DN 65)to NPS 12(DN 300),125 psig(8.6 bar)MaximumASME B16.38-2012(Revision of ASME B16.38-2007)Large Metallic Valvesfor Gas DistributionManually Operated,NPS 212(DN 65)to NPS 12(DN 300),125 psig(8.6 bar)MaximumAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USADate of Issuance:September 21,2012The next edition of this Standard is scheduled for publication in 2017.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically certain actions of the ASME B16 Committee may be published as Cases.Casesand interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable Letters Patent,nor assumes any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures andpolicies which precludes the issuance of interpretations by individual volunteers.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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.vi1Scope.12Construction.13Qualification Requirements.34Production Testing.4Figure1Bend Test Assembly.5Tables1Duration of Test.32Bending Moment Values.43Flow and Head Loss Coefficients.6Mandatory AppendixIReferences.7Nonmandatory AppendixAQuality System Program.8iiiFOREWORDThe B16 Standards Committee was organized in the spring of 1920 and held its organizational meetingon November 21 of that year.The group operated as a Sectional Committee(later redesignated as a StandardsCommittee)undertheauthorizationoftheAmericanEngineeringStandardsCommitteesubsequentlynamedAmerican Standards Association,United States of America Standards Institute,and now American NationalStandards Institute(ANSI).Sponsors for the group were the American Society of Mechanical Engineers,Manufacturers Standardization Society of the Valve and Fittings Industry,and the Heating and PipingContractors National Association(later the Mechanical Contractors Association of America).In 1982,theB16 Committee was reorganized as an ASME Committee operating under procedures accredited by ANSI.The American Gas Association determined that standardization of gas valves used in distribution systemswas desirable and needed.The A.G.A.Task Committee on Standards for Valves and Shutoffs was formedand development work commenced in 1958.In 1968,it was determined that a more acceptable documentwould result if approval was gained from ANSI,and to facilitate such action,the A.G.A.Committee becameSubcommittee 13 of the B16 activity.This B16 group was later renamed Subcommittee L,which is its currentdesignation.The first standard developed by Subcommittee L was ANSI B16.33,which was publ