Designation:D7843−21StandardTestMethodforMeasurementofLubricantGeneratedInsolubleColorBodiesinIn-ServiceTurbineOilsusingMembranePatchColorimetry1ThisstandardisissuedunderthefixeddesignationD7843;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodextractsinsolublecontaminantsfromasampleofin-serviceturbineoilontoapatchandthecolorofthemembranepatchisanalyzedbyaspectrophotometer.Theresultsarereportedasa∆Evalue,withintheCIELABscale.1.2Thistestmethodisnotappropriateforturbineoilswithdyes.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProductsD4378PracticeforIn-ServiceMonitoringofMineralTur-bineOilsforSteam,Gas,andCombinedCycleTurbinesD4898TestMethodforInsolubleContaminationofHydrau-licFluidsbyGravimetricAnalysisD5452TestMethodforParticulateContaminationinAvia-tionFuelsbyLaboratoryFiltrationD7317TestMethodforCoagulatedPentaneInsolublesinUsedLubricatingOilsbyPaperFiltration(LMOAMethod)E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE284TerminologyofAppearanceE308PracticeforComputingtheColo...
