ASMEANSIB169工厂制对焊件

ASMEB16.9-2001FACTORY-MADEWROUGHTBUTTWELDINGFITTINGSANAMERICANNATIONALSTANDARDASMEB16.9-2001FACTORY-MADEWROUGHTBUTTWELDINGFITTINGSANAMERICANNATIONALSTANDARDB16.9-20017/23/012:40PMPage1ANAMERICANNATIONALSTANDARDFACTORY-MADEWROUGHTBUTTWELDINGFITTINGSASMEB16.9-2001p.105-18-0110:39:37Unit:UCPTextfile:B16P9$$$CPp.1DateofIssuance:June22,2001ThisStandardwillberevisedwhentheSocietyapprovestheissuanceofanewedition.Therewillbenoaddendaissuedtothisedition.ThenexteditionofthisStandardisscheduledforpublicationin2005.ASMEwillissuewrittenrepliestoinquiriesconcerninginterpretationoftechnicalaspectsofthisStandard.ASMEistheregisteredtrademarkofTheAmericanSocietyofMechanicalEngineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunitytoparticipate.Theproposedcodeorstandardwasmadeavailableforpublicreviewandcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatoryagencies,andthepublic-at-large.ASMEdoesnot“approve,”“rate,”or“endorse”anyitem,construction,proprietarydevice,oractivity.ASMEdoesnottakeanypositionwithrespecttothevalidityofanypatentrightsassertedinconnectionwithanyitemsmentionedinthisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtheriskofinfringementofsuchrights,isentirelytheirownresponsibility.Participationbyfederalagencyrepresentative(s)orperson(s)affiliatedwithindustryisnottobeinterpretedasgovernmentorindustryendorsementofthiscodeorstandard.ASMEacceptsresponsibilityforonlythoseinterpretationsofthisdocumentissuedinaccordancewiththeestablishedASMEproceduresandpolicies,whichprecludestheissuanceofinterpretationsbyindividuals.Nopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.TheAmericanSocietyofMechanicalEngineersThreeParkAvenue,NewYork,NY10016-5990Copyright©2001byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllRightsReservedPrintedinU.S.A.p.305-18-0108:31:17Unit:UFWTextfile:B16P9$$$FWp.3FOREWORDIn1921,theAmericanEngineeringStandardsCommittee,laterAmericanStandardsAssociation(ASA),organizedSectionalCommitteeB16tounifyandfurtherdevelopnationalstandardsforpipeflangesandfittings(and,later,forvalves,gaskets,andvalveactuators).CosponsorsoftheB16CommitteeweretheAmericanSocietyofMechanicalEngineers(ASME),theHeatingandPipingContractorsNationalAssociation[nowtheMechanicalContractorsAssociationofAmerica(MCAA)],andtheManufacturersStandardizationSocietyoftheValveandFittingsIndustry(MSS).Cosponsorswerelaterdesignatedascosecretariatorganizations.Standardizationofweldingfittingswasinitiatedin1937byasubgroup(designatedSubgroup6)ofSubcommittee3.Afterconsiderationofseveraldrafts,astandardwasapprovedbytheCommittee,cosponsors,andASA,andpublishedwiththedesignationASAB16.9-1940.Revisionsweremadein1950and1955toaddsizesuptoNPS24andtocompletecoverageoffittingsinsomesizes.TheserevisionswereapprovedandpublishedasASAB16.9-1951andASAB16.9-1958.WiththesubgroupnowdesignatedSubcommittee6(laterSubcommitteeF),furtherrevisionswerebeguntoclarifytheintentofthestandard,toaddangularitytolerances,andtoincludefittingsofdifferenttypes(longradius-reducingelbowsandcrosses)andsmallersizes(NPS1⁄4and1⁄2).ThisrevisionwaspublishedasASAB16.9-1964afterASAapproval.AfterreorganizationofASA,firstastheUnitedStatesofAmericaStandardsInstitute(USASI),thenastheAmericanNationalStandardsInstitute(ANSI),withtheSectionalCommitteebeingredesignatedasanAmericanNationalStandardsCommittee,anotherrevisionincreasingthesizerangetoNPS48andrevisingthetextforclaritywasapprovedandpublishedasANSIB16.9-1971.In1975,SubcommitteeFbeganamajorrevisiontobringthestandarduptodatewithcurrentpracticeandusage.Commonfractionswereexpressedasdecimals(butwithoutintendinghigherprecision)andmetricdimensionalequivalentswereadded.Provisionsforstep-wisechangeofradiusforNPS3⁄4longradiuselbowsand180degreturnswereintroduced.FollowingStandardsCommittee,cosecretariat,andANSIapproval,therevisionwaspublishedasANSIB16.9-1978.Itwasupdatedbyacorrectiveaddendum,B16.9a-1981,issuedinFebruary1982.In1982,AmericanNationalStandardsCommitteeB16wasreorganizedasanASMECommitteeoperatingunderproceduresaccreditedbyANSI.InthisEdition,thetexthasbeenrevisedandinchdimensionsareestablishedasthestandard.FollowingapprovalbytheStandardsCommitteeandASME,approvalasanAmericanNationalStandardwasgivenbyANSIonNovember12,1986withthenewdesignationASME/ANSIB16.9-1986.In1991theSubcommitteereviewedthedocumentandmadeanumberofrevisions.Dimensionsforshortpatternlapjointswerealsoaddedtothis1993EditionoftheStandard.Inthis2001Edition,shortradiuselbowsandreturnswereaddedwhichincludesalldimensionsandtolerancesofASMEB16.28-1994.ThisEditionalsoprovidesmetricunitsasanindependentbutparalle