Designation:C450−18StandardPracticeforFabricationofThermalInsulatingFittingCoversforNPSPiping,andVesselLagging1ThisstandardisissuedunderthefixeddesignationC450;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidestablesofdimensionsofpre-formedpipeinsulationthatshallbeusedinfabricatinginsula-tioncoversforuseonvalves,ells,tees,flanges,andvesselsinthepressurerangefrom150to1500psi(1to10MPa).Thesetables,whicharepartofthisstandard,arepublishedseparatelyastheASTMRecommendedDimensionalStandardsforFab-ricationofThermalInsulationFittingCoversforNPSPipingandVesselLagging.Inaddition,theADJC0450AtablesforShortRadius(SR)andLongRadius(LR)ElbowsInsulationFittingCoversforpipingareincludedinthispractice.Thetablesweredevelopedtoprovidedimensionsforshopfabrica-tionuseinformingpipeinsulationfittingcoversonNPSpipeoperatingathightemperatureandlowtemperature.Thetablesalsoincludedimensionsforuseinformingthermalinsulationintocurvedsegments,andlagging,forapplicationonvessels.Thispracticedoesnotapplytoreflective-typeinsulation,insulationonscrewedelbows,ShortRadius(SR)andLongRadius(LR)ElbowsFittingCoversfortubing,dutchman(extendedleg)insulationfittingcovers,double-layeredstaggered-jointpipeinsulationfittingcovers,flexiblepre-formedpipe-tubeelastomericfoamfittingcoversinaccordancewithSpecificationC534/C534MorpolyolefinfoamfittingcoversinaccordancewithSpecificationC1427.1.1.1RefertoGuideC1710whenreferringtoinsulationmaterialsforfabricationofpreformedflexibleclosedcellinsulated90°elbows,tees,orsimilarproducts.1.2Thispracticedoesnotspecifyfabricationmethods.Thermalinsulationforfittingcoversisformedbynumerousfabricationmethods.Ingeneral,insulationsarecutbycircularorbandsaws,shapedbygrindersormillers,ormolded/preformed.Eachmethodhascertainadvantagesanddisadvantages,...
