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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.T29Underflaringandoverflaring                              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.
                                                                 TableT19Jointtighteningmethodguide
Installation                                                     Parkeralsorecommendsthatwhereverpossible,thestepof
                                                                 markingthenutpositionrelativetothebodyshouldbedone.This
Improperflaringorinstallationcausesoverhalfoftheleakage
                                                                 stepservesasaquickqualityassurancecheckforjointtighten-
withflaredfittings.Thus,properinstallationiscriticalforatrouble
                                                                 ing.Todothis,attheinitialwrenchresistanceposition,makea
freeoperation.
                                                                 longitudinalmarkononeoftheflatsofthenutandcontinueit
                                                                 ontothebodyhexwithapermanenttypeinkmarkerasshown
                                                                 inFig.T31.Then,attheproperlytightenedposition,markthe
                                                                 bodyhexoppositethepreviousmarkonthenuthex.
                                                                 Fig.T31Makereferencemarkonnutandtubebody
                                                                 Thesemarksservetwoimportantfunctions:
Fig.T30Improperbendandshorttube                          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