Designation:F704−81(Reapproved2018)´1AnAmericanNationalStandardStandardPracticeforSelectingBoltingLengthsforPipingSystemFlangedJoints1ThisstandardisissuedunderthefixeddesignationF704;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—EditorialcorrectionsweremadetoSection2inSeptember2018.1.Scope1.1Thispracticecoversboltandstudboltlengths,quantities,andthreadseriesforpipetopipeandpipetovalveflangedjoints(Note1)inthenominalpipesizerangesof1⁄2through48-in.(12.7through1219-mm)diameterandpressurerangeof125through2500psi(0.8through17236kPa).NOTE1—Thisisapplicablewhenflangeofvalvehasthesamethicknessasmatingflange.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASMEStandards:2B1.1UnifiedInchScrewThreads(UNandUNRThreadForm)B16.1GrayIronPipeFlangesandFlangedFittings:Classes25,125,and250B16.5PipeFlangesandFlangedFittings:NPS1/2throughNPS24Metric/InchStandardB16.24CastCopperAlloyPipeFlanges,FlangedFittings,andValves:Classes150,300,600,900,1500,and2500B18.2.1Square,Hex,HeavyHex,andAskewHeadBoltsandHex,H...
