ASME_B16.42-2021.pdf

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 New 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.CasesandinterpretationsarepublishedontheASMEwebsiteunder 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 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 Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto participate.The proposed codeorstandardwasmadeavailable forpublic reviewandcommentthatprovidesanopportunityfor additional public input 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 any items mentioned in thisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand policies,which precludes the issuance of 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2022 byTHE AMERICAN SOCIETY OF 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 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.21Tables3.1-1PressureTemperature 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 Elbows 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 Flanges.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 Flanges 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