ASME_B16.40-2002.pdf

The American Society ofMechanical EngineersN ATION ALSTAN D A RMANUALLY OPERATEDTHERMOPLASTICGAS SHUTOFFSAND VALVES IN GASDISTRIBUTION SYSTEMSASME B16.40-2002Revision of ANSI/ASME B16.40-1985(R1994)No roproduction or notworking permitled without liconso from IHSNot for RosaleDate of Issuance:July 15,2002The next edition of this Standard is scheduled for publication in 2007.Therewill be no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations oftechnical aspects of this Standard.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 forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not approve,rate,or endorseany item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentioned in this document,and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable letters patent,nor assumeany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies,which precludes the issuanceof interpretations 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright2o02byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.。with ASMENo roproduction or notworking permitled without liconso from IHSNot for RosaleCONTENTSForew0rdivStandards Committee Roster.dCorrespondence With the B16 Committee.vi1 Scope，。4。4+444。+4。412Construction.1Production and Qualification Testing.3Tables1Pressure Ratings for Valves for Service Temperatures From-20 to 73F(-29 to 23C).32Duration of Test.3Maximum Operating Torque Values.54AMinimum Sustained Pressure Test Requirements at 73F(23C).J4BMinimum Sustained Pressure Test Requirements at 100F(38C).55Flow and Head Loss Coefficients.6Mandatory AppendicesDesign Pressure for Valves.9References“10Nonmandatory AppendixA Quality System Program.11No roproduction or notworking permitled without liconso from IHSNot for RosaleFOREWORDThe B16 Standards Committee was organized in the spring of 1920 and held itsorganizational meeting on November 21 of that year.The group operated as a SectionalCommittee(later redesignated as a Standards Committee)under the authorization of theAmerican Engineering Standards Committee subsequently named American Standards Associ-ation,United States of America Standards Institute,and now American National StandardsInstitute(ANSI).Sponsors for the group were the American Society of Mechanical Engineers,Manufacturers Standardization Society of the Valve and Fittings Industry,and the Heatingand Piping Contractors Naational Association(later the Mechanical Contractors Associationof America).The American Gas Association determined that standardization of gas valves used indistribution systems was desirable and needed.The A.G.A.Task Committee on Standardsfor Valves and Shutoffs was formed and development work commenced in 1958.In 1968it was determined that a more acceptable document would result if approval were gainedfrom ANSI,and to facilitate such action the A.G.A.Committee became Subcommittee No.13 of the B16 activity.This B16 group was later renamed Subcommittee L,which is itscurrent designation.The first standard developed by Subcommittee L was B16.33.The B16.38 standard wassubsequently developed to cover larger sizes of gas valves and shutoffs.Since about 1965,the increased use of plastic piping in gas distribution systems brought with it the need forvalves and shutoffs of compatible material.To fill this need,the present standard wasdeveloped and initially appeared as ANSI B16.40-1977.Subcommittee L began review ofthis document in 1982.Editorial changes were made throughout the text to bring the format in line with therest of the B16 series of standards and to clarify the intent of this Standard.Revisionsinclude addition of rules for allowable pressure at temperatures above 74F for valves ofcertain materials,updating of reference standards,and editorial changes to text and tables.The cover,headings,and designation of the Standard have also been revised to reflectreorganization of the B16 Committee as an ASME Committee whose procedures areaccredited by ANSI.This Standard is offered on a subscription service basis that includesinterpretations and addenda up to the issuance of a new edition.All requests for interpretations or suggestions for revisions should be sent to the Secretary,B16 Committee,The American Society of Mechanical Engineers,Three Park Avenue,NewYork.NY 10016.In 2001,after several years and iterations,B16 Subcommittee L produced a fully reviseddocument.Among the many revisions were a new Definitions section,a new ImpactResistance section,and a nonmandatory Quality Systems Program Annex.Following approval by the B16 Main Committee and the ASME Supervisory Board,thisStandard was approved as an American National Standard by ANSI on February 6,2002.ivNo roproduction or notworking permitled without liconso from IHSNot for Rosale