BRITISHSTANDARDCONFIRMEDOCTOBER1993BS3293:1960IncorporatingAmendmentNo.1SpecificationforCarbonsteelpipeflanges—(Over24inchesnominalsize)—Forthepetroleumindustrywww.bzfxw.comBS3293:1960ThisBritishStandard,havingbeenapprovedbythePetroleumEquipmentIndustryStandardsCommitteeandendorsedbytheChairmanoftheEngineeringDivisionalCouncil,waspublishedundertheauthorityoftheGeneralCouncilon30December1960©BSI03-2000ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePEE/2DraftforcommentCZ(PEE)9923ISBN0580030660Co-operatingorganizationsThePetroleumEquipmentIndustryStandardsCommittee,underwhosesupervisionthisBritishStandardwasprepared,consistsofrepresentativesfromthefollowingGovernmentdepartmentsandscientificandindustrialorganizations:BritishIron&SteelFederation*CouncilofBritishManufacturersofPetroleumEquipment*EngineeringEquipmentUsers’AssociationFederationofBritishRubberandAlliedManufacturersInstituteofPetroleumMinistryofPowerOilCompaniesMaterialsAssociation*Theindustrialorganizationsmarkedwithanasteriskintheabovelist,togetherwiththefollowing,weredirectlyrepresentedonthecommitteeentrustedwiththepreparationofthisBritishStandard:BritishValveManufacturers’AssociationNationalAssociationofDropForgersandStampersAmendmentsissuedsincepublicationAmd.No.DateofissueComments1004August1972Indicatedbyasidelineinthemarginwww.bzfxw.comBS3293:1960©BSI03-2000iContentsPageCo-operatingorganizationsInsidefrontcoverForewordiiSection1.General1Scope12Designationandpressure/temperatureratings13Flangefacings14Nominalsizes1Section2.Materials5Materialsforflanges16Boltingmaterials1Section3.DimensionsandTolerances7Flanges18Flangefacingsandgaskets29Flangeboltingdimensions210Spot-facingandback-facingofflanges2Section4.Inspection11Inspection312Repairofdefects3Section5.Marking13Marking3Section6.PreparationandDespatch14Preparation315Despatch3Table1—Dimensionsofflanges,Class1504Table2—Drilling,boltingandfacingdimensionsforflanges,Class1505Table3—Dimensionsofflanges,Class3006Table4—D...
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