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4300Catalog GeneralTechnical ReturnT FluidCompatibility ChoosingtheTube I o ndex Thefluidcompatibilitychartonthefollowingpageisintended MaterialandType asaguideonlyandisnottobeconsideredasasoleselection criteriatouseParkerTubeFittingsinaspecificapplicationorwith Selectionoftubematerialdependsonthefluid,corrosivenature aspecificfluid.Otherfactorsthatmustbeconsideredinclude, oftheserviceenvironment,theoperatingtemperaturerange butarenotlimitedto:Fluidtemperature,ambienttemperature, andthemaximumoperatingpressure.ThetubeO.D.andwall system pressure (both operating and peak) and applicable thicknessselectiondependsonthesefourparameters. standardsorregulations.Formedianotlisted,pleasecontact Asimplemethodofselectingthepropertubetypeandmaterial yourParkerrepresentativeortheTubeFittingsDivision. isdescribedbelow. TableU7listsseveralcommontubetypeswiththeirrecommended operatingtemperatureranges,generalapplication,andfitting ProtectiveCoatingsonSteel compatibility.Basedonthefluidsystemparametersandmedia, Protectivecoatingssuchaselectroplatedzincandcadmium1)and selecttheappropriatetubetypeandmaterial. zincphosphateareusuallyappliedtosteelfittingsforextending Ifmediaand/orserviceenvironmentisdifferentfromthecom- theirusefulservicelifeincorrosiveenvironments.Cadmiumand monlyusedoneslistedinthegeneralapplicationcolumn,please zinccorrodesacrificially,protectingthesteelsubstratefromnor- consulttheFluidCompatibilitychartonthefollowingpageor malatmosphericrustingduetothecommonpresenceofoxygen, contacttheTubeFittingsDivision. moistureandacidicgases.Theyare,however,rapidlyattacked bymanyfluidsincludingthosecontainingacidichydrogenand ForselectingpropertubeO.D.andwallthicknessusethepro- reactivefluorine,chlorine,bromine,iodine,andnitrogen.Zinc ceduregivenonpageU15. platingwillfurtherbeattackedbystrongbasesorwaterwithpH >12.Zincreactswithglycolbasedfireresistantfluidsand Caution:Whenworkingwithhighlycorrosivemedia, formsagelatinouscompoundthatcanplugupfiltersandbe alwaysconsulttheTubeFittingsDivision. harmfulotherwise,inasystemwithmanyzincplatedtube andhosefittings.Steelfittingswithzincphosphatecoatingor stainlesssteelfittings,alongwithbrassfittingsinlowpressure applications,areviableoptions. Theotheroptionistorunthefluidthroughthesystem,without componentswithmovingpartsinit,withanauxiliarypower source,togenerateandflushthegelatinouscompound.Then re-connectallcomponents,changefiltersandchargethesystem withnewfluid. The corrosion resistance of the Chromium-6 Free standard surfacetreatmentisaminimumof25%improvedovertradi- tionalzincgold(hexavalent)chromatesurface.Additionally,the Chromium-6FreesurfacemeetstheEUendoflifevehicledirec- tiveandROHScompliance. Zincphosphatecoatingsprotectsteelbycoveringitssurface andwillretardrustingaslongastheinhibitingbarrierisnot broken. Caution:Wherelowtoxicityandlowcorrosionarere- quired,asinfoodorbeverageapplications,steelcoated withanyformofzincorotherprotectivecoatingsisnot recommended. Notes: 1) CadmiumisnotallowedbySAEandISOstardardsfor generalindustrialandcommercialuse.Somemilitary applicationsstillrequirecadmiumplating.Theserequire- mentsaremetwithspecial(non-standard)processingat extracost. U10 ParkerHannifinCorporation TubeFittingsDivision Columbus,Ohio http://www.parker.com/tfd
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