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4300Catalog PipeFittingsandPortAdapters ApplicationGuidelinesforTaperedThreads UN/UNFThreads StraightConnectorswithNPT/NTPF3/4-14andSmaller SAEJ1926usesUN/UNFthreadsandisoftenreferredtoas SAEStraightThread.Thefemaleportisoftenreferredtoas Straightconnectorswith3/4-14NPT/NPTFandsmallermale ORBorO-ringboss.Thisportstyle,showninFig.G4,iswidely pipethreadshaveveryhighpressureholdingcapabilityandseal usedinNorthAmerica. reliabilitywhenusedinapplicationswithout"makeandbreak" (suchasmaintenance)requirements. Theyarealsowellsuitedforlowcyclenon-pulsating(static) applicationswithpressuresinexcessof6,000psi. StraightConnectorswithNPT/NPTFabove3/4-14and AllShapedConnectorswithNPT/NPTFThreads Itisdifficulttoalwaystightenshapeswithpipethreadstoan optimumtightnesslevelbecauseoforientationrequirements. Also,allconnectorsinthiscategorywithpipethreadshavelow reliabilityforleakfreeoperationindynamicapplications.There- fore,theyarenotpreferredwherealeakfreejointisrequired. Fig.G4--TypicalO-RingBossPort AllNPTFConnectors Whileapipethreadconnectioncanbedisassembledandre- BSPP assembledinlow-pressuresystems,itisnotintendedtobea frequently assembled and disassembled connection. (When In Europe, Japan and many other former Commonwealth connectorsareknowntobedisassembledandre-assembled nations, the British Standard Pipe thread form, BSP, is still repeatedly,pipeconnectionsarenotpreferredforhigh-pres- usedextensivelytoconnectpipesandcomponentsinhydraulic suresystems.) systems.TheBSPthreadisofferedinastraight(parallel)form knownasBSPPandataperedformknownasBSPT.These Fortheaboveapplications,aportconnectionwithanelastomeric threadsfeaturea55�flankangle.Fittingsinthissectionwith seal,suchasSAEstraightthreadport(SAEJ1926/ISO11926), maleBSPPthreadsuseaprimarysealingmethodofanO-ring SAEfourboltsplitflange(SAEJ518/ISO6162),andISO6149 andretainingring,asshowninFig.G5. isrecommended.Forapplicationswhereelastomericsealscan't beused,consultthemanufacturer. Asnoted,BSPTandmetrictaperaredesignedandperform similarly.FollowtheNPT/NPTFguidelinesfortheirapplication. In general, tapered thread connections have the following limitationswhichshouldbeconsideredwhenspecifyingport connections: � Poordynamicsealingcharacteristics Fig.G5--O-RingwithRetainingRing � Possibleexpansion,andevencracking,oftheport � Orientationisaconcerninshapedconnectors AdditionalsealingmethodssuchasacuttingfaceoranEOlastic � Largerthreadsaremorepronetoleakagebecauseof seal,asshowninFig.G6,arealsoavailableonotherfittings morepotentialleakpoints withinthecatalog.TheseBSPPfittingsarealldesignedtothread � Systemcontaminationduetothreadsealant intoafemaleBSPPport(ISO1179),however,thesealiscre- atedwithoneoftheaforementionedsealingmethods,notwith � Pronetogalling,especiallyinstainlesssteel thethreads.ItisalsoimportanttonotethatwiththeseBSPP � Limitedremakeability threadedconnections,thesealoccursontheportsurface,or spotface,notinanO-ringglandorchamferasSAEandISO- ParallelThreadAdapters 6149straightthreaddo.AdetailoftheBSPPportisshownon Straight,orparallel,threadportsinvariousformsarebecom- pageU29. ingmorepopularinhydraulicsystemsbecausetheyaremore reliableandeasiertoservice. Threetypesofthreadsareusedforparallelthreadports: � UN/UNF(SAEstraightthread) � BSPP(BritishStandardPipe,Parallel) � Metricparallel Becauseparallelthreadsonlyserveonefunction(i.e.holding the fittinginplace),someothermeansofsealingisalways present,suchasanelastomericO-ringorametalseal.There Fig.G6--O-RinginFittingGroove aremanyvariationsofsealingmethods,andinsomecases, theyareinterchangeableamongthedifferentthreadformsand mayappeartobesimilar. Dimensionsandpressuresforreferenceonly,subjecttochange. G5 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
Goodyear Rubber Products
