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/.&3*$//5*0/-45/%3%4.&# 3FWJTJPOPG4.&#'PSHFE'JUUJOHT4PDLFU8FMEJOHBOE5ISFBEFE((RevisionofASMEB16.11-2005)ForgedFittings,Socket-WeldingandThreadedANAMERICANNATIONALSTANDARDḷ߶࠶ӛ㖁ZZZE]I[ZFRPݽ䍩л䖭()()DateofIssuance:August14,2009ThenexteditionofthisStandardisscheduledforpublicationin2014.Therewillbenoaddendaissuedtothisedition.ASMEissueswrittenrepliestoinquiriesconcerninginterpretationsoftechnicalaspectsofthisStandard.InterpretationsanditemsapprovedaserratatothiseditionarepublishedontheASMEWebsiteundertheCommitteePagesat“approve,”“rate,”or“endorse”anyitem,construction,proprietarydevice,oractivity.ASMEdoesnottakeanypositionwithrespecttothevalidityofanypatentrightsassertedinconnectionwithanyitemsmentionedinthisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumesanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtheriskofinfringementofsuchrights,isentirelytheirownresponsibility.Participationbyfederalagencyrepresentative(s)orperson(s)affiliatedwithindustryisnottobeinterpretedasgovernmentorindustryendorsementofthiscodeorstandard.ASMEacceptsresponsibilityforonlythoseinterpretationsofthisdocumentissuedinaccordancewiththeestablishedASMEproceduresandpolicies,whichprecludestheissuanceofinterpretationsbyindividuals.Nopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.TheAmericanSocietyofMechanicalEngineersThreeParkAvenue,NewYork,NY10016-5990Copyright©2009byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllrightsreservedPrintedinU.S.A.()()CONTENTSForeword........................................................................ivCommitteeRoster................................................................viCorrespondenceWiththeB16Committee.........................................vii1ScopeandGeneral............................................................12PressureRatings..............................................................13SizeandType................................................................74Marking......................................................................85Material......................................................................86Dimensions...................................................................87AdditionalTolerances.........................................................98ProofTesting.................................................................9Figures1MethodofDesignatingOutletsofReducingTeesandCrosses.................82WeldingGapandMinimumFlatDimensionsforSocket-WeldingFittings......9Tables1Socket-WeldingFittings......................................................22ForgedThreadedFittings.....................................................33ForgedThreadedFittings—StreetElbows....................................44ThreadedFittings............................................................55PlugsandBushings..........................................................66TypesofFittingsbyClassDesignationandNPSSizeRange...................77CorrelationofFittingsClassWithScheduleNumberorWallDesignationofPipeforCalculationofRatings.............................................78NominalWallThicknessofSchedule160andDoubleExtraStrongPipe........7MandatoryAppendicesIInchTables...................................................................11IIReferences...................................................................17NonmandatoryAppendixAQualitySystemProgram.....................................................18iiiḷ߶࠶ӛ㖁ZZZE]I[ZFRPݽ䍩л䖭()()FOREWORDTheSectionalCommitteeontheStandardizationofPipeFlangesandFittings,B16,organizedin1920undertheprocedureoftheAmericanStandardsAssociation(ASA)appointedasubgroupofSubcommittee3(nowSubcommitteeF)toinitiatethestandardizationofweldingfittingsinMay1937.Thefirstmeetingofthisgroupwasheldlaterthatmonth,andatitsmeetinginDecember1938,inNewYork,itwasagreedtoundertakethestandardizationofdimensionsofsocket-weldingfittingsandtoreferthisprojecttoanewdraftingsubgroup.Oneofthemostimportantdimensionsofthistypeoffittingrequiringstandardizationwasconsideredtobethedimensionfromthecenterlineofthefittingtothebottomofthesocket,sincefromthestandpointofthedesigning