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4300Catalog Assembly/Installation Triple-LokAssembly jointtightnessorclampingload.Therefore,itisrecommended tousethismethodwhereverpossible,andespeciallywherethe platingcombinationofcomponentsisnotknown,andduring maintenanceandrepairwherethecomponentsmaybeoily.Use TableT19asaguideforpropertighteningmethod. Condition RecommendedTighteningMethod Underflared Overflared 1. Platingofallcomp-Eithermethodisacceptable. assembly assembly onentsisthesame. UseTableT20. 2. Platingismixed. UseFFWRmethod. Fig.T29�Underflaringandoverflaring 3. Platingofnutand UseFFWRmethod. sleeveorhoseend Theflaremustbereasonablysquareandconcentricwiththe isunknown. tubeO.D.;anditssurfacemustbesmooth,freeofrust,scratches, 4. Partsareoily. UseFFWRmethod. splits,weldbeads,drawmarks,embeddedchips,burrsordirt. Ifthe flaredoesnotmeettheaboverequirements,cutitoff, 5. Stainlessorbrass UseFFWRmethod. determinetheprobablecausefromthetroubleshootingguide components. showninTableT21,takecorrectiveactionandre-flare. TableT19�Jointtighteningmethodguide Installation Parkeralsorecommendsthatwhereverpossible,thestepof markingthenutpositionrelativetothebodyshouldbedone.This Improperflaringorinstallationcausesoverhalfoftheleakage stepservesasaquickqualityassurancecheckforjointtighten- withflaredfittings.Thus,properinstallationiscriticalforatrouble ing.Todothis,attheinitialwrenchresistanceposition,makea freeoperation. longitudinalmarkononeoftheflatsofthenutandcontinueit ontothebodyhexwithapermanenttypeinkmarkerasshown inFig.T31.Then,attheproperlytightenedposition,markthe bodyhexoppositethepreviousmarkonthenuthex. Fig.T31�Makereferencemarkonnutandtubebody Thesemarksservetwoimportantfunctions: Fig.T30�Improperbendandshorttube 1. Thedisplacedmarksserveasaquickqualityassurance checkthatthejointhasbeentightened. 2. Thesecondmarkonthebodyservesasapropertighten- Alignthetubeontheflare(nose)ofthefittingbodyandtighten ingpositionafterajointhasbeenloosened. thenutusingoneoftwomethodsdescribedbelow. Theflatsmethodisslowerthanthetorquemethod,butithasthe twodistinctadvantagesdescribedearlier,namely,circumven- 1. FlatsfromWrenchResistance(FFWR)or"Flats"method tionofplatingdifferencesandaquickvisualcheckforproper 2. Torquemethod jointtightening. Note:Donotforceanimproperlybenttubeintoalign- TorqueMethod ment(Fig.T30)ordraw-intooshortatubeusingthenut. Withpropertubeflarealignmentwiththenoseofthefitting, Itputsundesirablestrainonthejointleading,eventually, tightenthenuttoappropriatetorquevalueinTableT20.This toleakage. methodisfastandaccuratewhenpresettorquewrenchesare FlatsMethod used.Consistentcomponentselectionisrecommendedsothat theeffectsofdissimilarplatingisnotanadversefactorinjoint Tightenthenutlightlywithawrench(approximately30in.lb.), integrity.Thismakesitdesirableforhighproductionassembly clampingthetubeflarebetweenthefittingnoseandthesleeve. lines.However,ajointassembledusingthetorquemethodcan ThisisconsideredtheWrenchResistance(WR)position.Starting onlybecheckedforpropertighteningbytorquingitagain. fromthisposition,tightenthenutfurtherbythenumberofflats fromTableT20.Aflatisreferredtoasonesideofthehexagonal Note:Thismethodshouldnotbeusedifthetypeofplat- tubenutandequatesto1/6ofaturn. ingonthefittingandmatingparts(sleeve+nutorhose swivel)isnotknown.Thetorquemethodshouldnotbe ThisFlatsmethodismoreforgivingofthetwo.Itcircumvents usedforlubricatedoroilypartsasimproperclamping theeffectsofdifferencesinplating,lubrication,surfacefinishes, forcesmayresult.Over-tighteningandfittingdamage etc.,thatgreatlyinfluencethetorquerequiredtoachieveproper mayoccurasaresult. T21 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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