1、AN AM E R IC AN NAT IO NAL STANDARDASME B16.42-2021(Revision of ASME B16.42-2016)Ductile Iron PipeFlanges andFlanged FittingsClasses 150 and 300ASME B16.42-2021(Revision of ASME B16.42-2016)Ductile Iron PipeFlanges andFlanged FittingsxClasses 150 and 300AN AMERICAN NATIONAL STANDARDTwo Park Avenue N
2、ew York,NY 10016 USAxDate of Issuance:February 4,2022The next edition of this Standard is scheduled for publication in 2026.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Periodically certainactionsoftheASMEB16CommitteemaybepublishedasCases.
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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 2022 byTHE AMERICAN SOCIETY OF
11、MECHANICAL ENGINEERSAll rights reservedCONTENTSForeword.vCommittee Roster.viCorrespondence With the B16 Committee.viiSummary of Changes.ixList of Changes in Record Number Order.x1Scope.12General.13PressureTemperature Ratings.24Size.25Marking.36Materials.37Dimensions.38Tolerances.59Testing.5Mandatory
12、 AppendixIReferences.22Nonmandatory AppendicesAQuality System Program.23BMethods for Establishing PressureTemperature Ratings.24Figures4.2-1Method of Designating Outlets of Reducing Fittings.77.9.3-1Method of Designating Location of Tapped Holes for Drains When Specified.21Tables3.1-1PressureTempera
13、ture Ratings.63.1-1CPressureTemperature Ratings.67.1.1-1DimensionsofClass150Elbows,DoubleBranch Elbows,Tees,Crosses,Laterals,TrueYs(StraightSizes),and Reducers.87.1.1-2Dimensions of Class 300 Elbows,Tees,Crosses,Laterals,True Ys(Straight Sizes),and Reducers107.1.4-1Dimensions of Class 150 Base Elbow
14、s and Base Tees.127.1.4-2Dimensions of Class 300 Base Elbows and Base Tees.137.3-1Templates for Drilling Class 150 Ductile Iron Flanges.147.3-2Templates for Drilling Class 300 Ductile Iron Flanges.15iii7.4-1Dimensions of Class 150 Ductile Iron Flanges.167.4-2Dimensions of Class 300 Ductile Iron Flan
15、ges.187.5.2-1Reducing Threaded Flanges for Classes 150 and 300.20ivFOREWORDIn 1921,the American Engineering Standards Committee,later the American Standards Association(ASA),now theAmericanNationalStandardsInstitute(ANSI),authorizedtheorganizationofaSectionalCommitteeontheStandardiza-tion of Pipe Fl
16、anges and Flanged Fittings,with the following organizations as joint sponsors:Heating,Piping,and AirConditioningContractorsNationalAssociationlatertheMechanicalContractorsAssociationofAmerica(MCAA),Manu-facturers Standardization Society of the Valves and Fittings Industry(MSS),and The American Society of MechanicalEngineers(ASME).CastironflangesandflangedfittingsarewithinthescopeofSubcommitteeNo.1(nowSubcommitteeA),with standards approved by ASA as early as 1928.In 1957,piping components of duct
