6-38_Edtn_2007.pdf

Large Metallic Valves for Gas DistributionManually Operated,NPS 21/2(DN 65)to NPS 12(DN 300),125 psig(8.6 bar)MaximumAN AMERICAN NATIO NAL STANDARDASME B16.38-2007Revision of ANSI/ASME B16.38-1985(R2005)Copyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ASME B16.38-2007Revision of ANSI/ASME B16.38-1985(R2005)Large MetallicValves forGas 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 10016Copyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:February 4,2008The next edition of this Standard is scheduled for publication in 2012.There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.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 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.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.8iiiCopyright 2008 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDThe 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,