Designation:C921−10(Reapproved2015)StandardPracticeforDeterminingthePropertiesofJacketingMaterialsforThermalInsulation1ThisstandardisissuedunderthefixeddesignationC921;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thispracticecoversjacketsappliedoverthermalinsu-lationonpipingandequipment,includingmaterialsappliedsolelyforphysicalprotection,andmaterialsappliedasvaporretarders.1.2Thispracticeprovidesmaterialandphysicalrequirements,orboth,forjackets.GuidanceinselectingtheproperjacketforagivenapplicationcanbefoundinGuideC1423.1.3Thispracticedoesnotcoverfieldappliedmasticsorbarriercoatingsandtheirattendantreinforcements,nordoesitcoverjacketsforburiedinsulationsystems.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A240/A240MSpecificationforChromiumandChromium-NickelStainlessSteelPlate,Sheet,andStripforPressureVesselsandforGeneralApplicationsA336/A336MSpecificationforAlloySteelForgingsforPressureandHigh-TemperaturePartsA653/A653MSpecificationforSteelSheet,Zinc-Coated(Galvanized)orZinc-IronAlloy-Coated(Galvannealed)bytheHot-DipProcessA792/A792MSpecificationforSteelSheet,55%Aluminum-ZincAlloy-CoatedbytheHot-DipProcessB209SpecificationforAluminumandAluminum-AlloySheetandPlateC168TerminologyRelatingtoThermalInsulationC390PracticeforSamplingandAcceptanceofThermalInsulationLots...
