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4300Catalog Assembly/Installation Seal-LokAssembly 2. Cleaningthetubeend:Alloilandoxidebuid-upmustbe InspectionofBrazing removedfromthetubeendforatleastthelengthofthebraze Inspectthebrazeforafilletallthewayaroundthetubeatthe joint.Oilmayberemovedbyusinganoil-freesolvent.Oxide farend(smalldiameter)ofthesleeve. build-upmayberemovedbypicklingorbylightlysanding withanaluminum-freeemerypaper. Caution:Iftherearegapsinthefillet,thejointmaynotbesound. 3. Fixturingthepartsforbrazing:Careshouldbetakenso Inthiscase,rebrazingisrecommended.Removethesleeveand thebrazefixtureallowsthesleevetosettleandbottomon rebrazeanewoneinitsplace. thetubecompletelyduringheating.SincetheSeal-Lokfitting sleeveisdesignedforaslipfit,thisshouldhappeneasily.Short Nobrazealloyoverrun tubescanbebrazedintheverticalposition.Onlongertubes, Filletalltheway onsealingsurface thejointmayneedtobeinthehorizontalposition,requiring aroundthetube aslightnudgetoseatthesleeveonthetube. 4. Applying flux: Apply proper flux to tube end (about 1� sleevelengths)andsleeve'sfaceandoutsidesurface.Insert appropriatebrazeringinthesleeveandplacethesleeveon endofthetube.Thefluxhelpsprotectthepartsfromoxidizing andpromotesbrazeflow. 5. Heatingthepart:Applyheatuniformlytothejointbyusing amulti-flametorchasshowninFig.T21orwithaninduction Fig.T23�Brazedfitting brazeunit.Properbrazinginvolvesheatingtheassemblyto brazingtemperatureandflowingthefillermetalthroughthe joint.Heatshouldbeappliedbroadlyanduniformlytothe Inspectthesealingsurface.Thereshouldbenobrazealloy tubeaswellastheSeal-Loksleeve.Keepinmindthatthicker overrunorbuild-uponthissurface.Ifthereisbuild-up,removeit fittingandtubingsectionstakelongertoheat.Theentire withemerypaper,beingcarefulnottoscratchthesealsurface. assemblyshouldheattobrazingtemperatureataboutthe Ifthisisnotpossible,removetheoldsleeveandrebrazeanew sametime.Thebrazealloywillalwaysflowtowardsthearea oneinitsplace. ofhighertemperature.Thepre-formedbrazeringhasbeen placedinsidethejointarea--thelastareatoreachmelting FinalInstallation temperature.Therefore,whenyouseethebrazematerialflow The following steps are required for final installation of the totheoutsideofthejoint,youknowthejointiscomplete.If Seal-Lokfitting: thesleevedoesnotsettle,aslightpressurewillcausethe sleevetosettle,completingthebrazejoint. 1. EnsurethatthecorrectO-ringisproperlyinstalledinthe grooveofthefitting,ifnotalreadypre-installedbythefitting 6. Cleaningthebrazedjoint:Afterstoppingheatapplication, manufacturer(ParkerprovidesSeal-Lokfittingswithpre-in- allowabout10secondsforthebrazealloytosolidify.Then, stalledO-rings).SinceSeal-Lokismachinedwiththecaptive immerse the joint in hot water (approx. 140�F.).To make O-ringgroove(CORG),itisrecommendedthataCORG cleaningeasier,addParkerBrazeCleanertothehotwater. assemblytoolbeutilized,asshowninFig.T24.Toproperly Thissuddencoolingcracksthebrazefluxresidue,makingit usetheassemblytool,followthesesteps easiertoremove.Anyremainingresiduecanberemovedby carefulwirebrushing,makingsurenottoscratchthesealing � PositiontheO-ringinsidetheCORGassemblytoolagainst surfaceofthesleeve. thepusher. 7. Corrosionprotectionafterbrazing:Thisisanextremely � PositionthetoolovertheSeal-Loktubeenduntiltheendis importantstepfollowingbrazingandevenmoresofollowing bottomedinthetool. theuseofabrazecleaner.BrazecleanerssuchasHandy � PushtheplungerofthetooluntiltheO-ringisinsertedand andHarmanPostBrazeCleaneravailablefromParkerand seatedintothegroove. Bernite451whichareusedtofacilitatetheremovalofresidual fluxafterbrazing,aregenerallycorrosive.Theresiduelefton thesurfacebythecleaner,especiallyontheI.D.ofthetube, cancauserustingincarbonsteeltubesratherquickly,ifit isnotneutralized.Therefore,itisimportanttoneutralizethe cleanerresidueaftercleaningwithasolutionsuchasBernite 1362(mix4ouncesofBernite136withonegallonofwater). Ifthebrazedpartsarenottobeusedsoonafterbrazing, acoatingofrustinhibitorssuchasWD-403orSP-3504is recommendedforthebrazeandheataffectedarea. 1&2)ProductsofBerniteProducts,Inc.84NewYork,Westbury,NY11500 (516)338-4646. 3)AproductofWD-40Company,SanDiego,CA92220. 4)AproductofCRCChemicals,USA,Warminister,PA18974(215)674-4300 Fig.T24�O-RinginstallationusingtheCORG assemblytool T17 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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