1、AN AM E R IC AN NAT IO NAL STANDARDASME B16.39-2019(Revision of ASME B16.39-2014)Malleable Iron Threaded Pipe UnionsClasses 150,250,and 300ASME B16.39-2019(Revision of ASME B16.39-2014)Malleable IronThreaded Pipe UnionsxClasses 150,250,and 300AN AMERICAN NATIONAL STANDARDxDate of Issuance:March 18,2
2、020The 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.CasesandinterpretationsarepublishedontheASMEwebsit
3、eunder the Committee Pages at http:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon
4、the date posted.TheCommitteePagescanbefoundathttp:/cstools.asme.org/.Thereisanoptionavailabletoautomaticallyreceiveane-mailnotification when errata are posted to a particular code or standard.This option can be found on the appropriate CommitteePage after selecting“Errata”in the“Publication Informat
5、ion”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandcon
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10、e 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 2020 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U
11、.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viSummary of Changes.viiiList of Changes in Record Number Order.ix1Scope.12Design.13PressureTemperature Ratings.24Size.25Marking.26Materials.27Joints and Seats.28Threading of Pipe Ends.29Hydrostatic Strength.310Tensile S
12、trength.311Air-Pressure Test.312Sampling for Air-Pressure Test.313Coatings.314Dimensions.3Mandatory AppendixIReferences.6Nonmandatory AppendixAQuality System Program.7Tables3-1PressureTemperature Ratings.26-1Tensile Strength of Unions.314-1Dimensions of Class 150 Malleable Iron Threaded Unions.414-2
13、Dimensions of Class 250 Malleable Iron Threaded Unions.414-3Dimensions of Class 300 Malleable Iron Threaded Unions.5iiiFOREWORDIn 1921,the American Engineering Standards Committee,later the American Standards Association(ASA),now theAmericanNationalStandardsInstitute(ANSI),authorizedtheorganizationo
14、faSectionalCommitteeontheStandardiza-tion of Pipe Flanges and Flanged Fittings,with the following organizations as joint sponsors:Heating,Piping,and AirConditioningContractorsNationalAssociation,latertheMechanicalContractorsAssociationofAmerica(MCAA);Manu-facturers Standardization Society of the Val
15、ve and Fittings Industry(MSS);and the American Society of MechanicalEngineers(ASME).ThreadedfittingswereaddedtothescopeoftheB16Committee,andSubcommitteeNo.2(nowSubcommitteeB)wasmade responsible for threaded fittings other than steel.Standards for cast and malleable iron fittings were approved byASA
16、as early as 1927.For many years,the need for standardization of threaded malleable iron unions was met by Federal Specifications(published by the General Services Administration)and other documents published by the Association of AmericanRailroads(AAR)and the Underwriters Laboratories(UL).As these standards continued to diverge,however,manu-facturers concluded that a common practice would be desirable.Accordingly,beginning in 1967,MSS developed astandard practice embodying features of the existi
