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4300Catalog Assembly/Installation PortEndAssembly Thevarietyofthreadformsavailableundertaperthreadsin- TaperedThreadPortAssembly clude: Thepropermethodofassemblingtaperedthreadedconnectors NPT�AmericanStandardTaperPipeThread(ANSIB1.20.1). istoassemblethemfingertightandthenwrenchtightenfurther tothespecifiednumberofturnsfromfingertight(T.F.F.T.)givenin NPTF�DrysealAmericanStandardTaperPipeThread(SAE TableT5.Thefollowingassemblyprocedureisrecommendedto J476,ANSIB1.20.3). minimizetheriskofleakageand/ordamagetocomponents. BSPTorJIS"PT"�BritishStandardPipe,Tapered(BS21, 1. Inspectcomponentstoensurethatmaleandfemaleport JISB0203,ISO7),alsoknownas"R"formaleand"Rc"for threadsandsealingsurfacesarefreeofburrs,nicksand female. scratches,oranyforeignmaterial. 2. Applysealant/lubricanttomalepipethreadsifnotpre-ap- M-Keg�Metrictaperthreads(DIN158). plied.Forstainlesssteelfittings,theuseofParkerThread- matesealant/lubricantisstronglyrecommended.(Pre-ap- ThevastmajorityofParkerTubeFittingsDivision'sstandardpipe plieddrysealantsarepreferredoverothersealants).With threadfittingsaremachinedwiththeNPTFthreadform.NPTF anysealant,thefirstonetotwothreadsshouldbeleft threadisalsoreferredtoasDrysealPipeThread. uncoveredtoavoidsystemcontamination.IfPTFEtape ThefullthreadprofilecontactofNPTFthreadsisdesignedtogive isuseditshouldbewrapped1-1/2to2turnsinclockwise thetaperedthreadsself-sealingabilitywithoutthreadsealant. directionwhenviewedfromthepipethreadend. However,variationsinconditionofmatingthreads,fittingand Caution:Morethantwoturnsoftapemaycausedistortion portmaterials,assemblyproceduresandoperatingconditions orcrackingoftheport. makeself-sealinghighlyimprobable.Sometypeofthreadseal- 3. Screwtheconnectorintotheporttothefingertightposi- antis,therefore,requiredtoachievepropersealand,insome tion. cases,additionallubricitytopreventgalling. 4. WrenchtightentheconnectortotheappropriateT.F.F.T. TypesofSealant/Lubricant valuesshowninTableT5,makingsurethatthetubeendof ashapedconnectorisalignedtoreceivetheincomingtube Sealant/Lubricants assist in sealing and provide lubrication orhoseassembly.Neverbackoff(loosen)pipethreaded duringassembly,reducingthepotentialforgalling.Pipethread connectorstoachievealignment. sealantsareavailableinvariousformssuchasdrypre-applied, 5. Ifleakagepersistsafterfollowingtheabovesteps,check tape,pasteandanaerobicliquid. fordamagedthreadsandtotalnumberofthreadsengaged. Pre-appliedsealants,suchas"Vibraseal"(registeredtrade-mark Ifthreadsonthefittingarebadlynickedorgalled,replacethe ofLoctiteCorporation)andpowderedPTFEareusuallyapplied fitting.Ifportthreadsaredamaged,re-tap,ifpossible,orreplace toconnectorsbythemanufacturer.Connectorswithsomeof thecomponent.Iftheportiscracked,replacethecomponent. thesesealantsmayberemadeafewtimeswithoutneeding additionalsealant.Vibrasealmayalsohelpreduceloosening Normally,thetotalnumberoftaperedthreadsengagedshould duetovibration. bebetween3-1/2and6.Anynumberoutsideofthisrangemay indicateeitherunderorovertighteningofthejointoroutoftoler- PTFEtape,ifnotappliedproperly,cancontributetosystem ancethreads.Ifthejointisundertightened,tightenitfurtherbutno contamination during assembly and installation. In addition, morethanonefullturn.Ifitisovertightened,checkboththreads, becauseofPTFE'shighlubricity,fittingscanbemoreeasilyover andreplacethepartwhichhasout-of-tolerancethreads. tightened;anditdoesnotoffermuchresistancetoloosening duetovibration. Asageneralrule,pipefittingswithtaperedthreadsshouldnot beassembledtoaspecifictorquebecausethetorquerequired Pastesealantscanalsocontributetosystemcontamination, forareliablejointvarieswiththreadquality,portand fitting ifnotappliedproperly.Theyarealsomessytoworkwith;and materials, sealant used, and other factors. Where many of sometypesrequireacureperiodaftercomponentinstallation, thesefactorsarewell-controlled,suchasparticularjobsonan priortosystemstartup. assemblyfloor,atorquerangethatproducesthedesiredresults Anaerobicliquidsareavailablefromseveralmanufacturersand maybedeterminedbytestandusedinlieuofturnscountfor performsealingaswellasthreadlockingfunctions.Theyare properjointassembly. appliedtotheconnectorsbytheuserandrequireacureperiod priortosystemstartup.Somearesolubleincommonhydraulic TaperedPipe fluidsandwillnotcontaminatethesystem.Forproperperformance ThreadSize theyneedtobeappliedtocleananddrycomponents,carefully BSPT NPTF T.F.F.T. followingthemanufacturer'sdirections. 1/8-28 1/8-27 2-3 1/4-19 1/4-18 2-3 3/8-19 3/8-18 2-3 1/2-14 1/2-14 2-3 3/4-14 3/4-14 2-3 1-11 1-111/2 1.5-2.5 11/4-11 11/4-111/2 1.5-2.5 11/2-11 11/2-111/2 1.5-2.5 2-11 2-111/2 1.5-2.5 TableT5�AssemblyTurnsFrom FingerTight(T.F.F.T)ValuesFor Steel,StainlessSteelandBrassPipe Fittings Dimensionsandpressuresforreferenceonly,subjecttochange. T7 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
Goodyear Rubber Products
