Designation:D3338/D3338M−20aStandardTestMethodforEstimationofNetHeatofCombustionofAviationFuels1ThisstandardisissuedunderthefixeddesignationD3338/D3338M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoverstheestimationofthenetheatofcombustion(megajoulesperkilogramor[Btuperpound])ofaviationgasolinesandaircraftturbineandjetenginefuelsintherangefrom40.19MJ⁄kgto44.73MJ⁄kgor[17280Btu⁄lbto19230Btu⁄lb].Theprecisionforestimationofthenetheatofcombustionoutsidethisrangehasnotbeendeterminedforthistestmethod.1.2ThistestmethodispurelyempiricalandisapplicabletoliquidhydrocarbonfuelsthatconformtothespecificationsforaviationgasolinesoraircraftturbineandjetenginefuelsofgradesJetA,JetA-1,JetB,JP-4,JP-5,JP-7,andJP-8.NOTE1—TheexperimentaldataonheatofcombustionfromwhichtheTestMethodD3338correlationwasdevisedwasobtainedbyaprecisionmethodsimilartoTestMethodD4809.NOTE2—Theestimationofthenetheatofcombustionofahydrocarbonfuelisjustifiableonlywhenthefuelbelongstoawell-definedclassforwhicharelationbetweenheatofcombustionandaromaticandsulfurcontents,density,anddistillationrangeofthefuelhasbeenderivedfromaccurateexperimentalmeasurementsonrepresentativesamplesofthatclass.Eveninthiscase,thepossibilitythattheestimatesmaybeinerrorbylargeamountsforindividualfuelsshouldberecognized.Thefuelsusedtoestablishthecorrelationpresentedinthismethodaredefinedasfollows:Fuels:Aviationgasoline—Grades100/130and115/145(1,2)2Kerosenes,alkylates,andspecialWADCfuels(3)Purehydrocarbons—paraffins,naphthenes,andaromatics(4)FuelsforwhichdatawerereportedbytheCoordinatingResearchCouncil(5).NOTE3—Thepropertyrangesusedinthiscorrelationareasfollows:Aromatics—from0%bymassto100%bymassAPIGravity—from[25.7°to81.2...
