Designation:D7153−15IP529⁄15StandardTestMethodforFreezingPointofAviationFuels(AutomaticLaserMethod)1ThisstandardisissuedunderthefixeddesignationD7153;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthetem-peraturebelowwhichsolidhydrocarboncrystalsmayforminaviationturbinefuels.1.2Thistestmethodisdesignedtocoverthetemperaturerangeof–80°Cto20°C;however,theinterlaboratorystudymentionedin12.4hasonlydemonstratedthetestmethodwithfuelshavingfreezingpointsintherangeof–60°Cto–42°C.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2386TestMethodforFreezingPointofAviationFuelsD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProducts2.2EnergyInstituteStandard:IP16DeterminationFreezingPointofAviationFuels33.Terminology3.1Definitions:3.1.1freezingpoint,n—inaviationfuels,thefueltempera-tureatwhichsolidhydrocarboncrystals,formedoncooling,disappearwhenthetemperatureofthefuelisallowedtoriseunderspecifiedconditionsoftest.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1automaticlasermethod,n—theproceduresofauto-maticallycoolingaliquidaviationfuelspecimenuntilsolidhydrocarboncrystalsappear,followedbycontrolledwarmingandrecordingoftemperatureatwhichhydrocarboncrystalscompletelyredissolveintotheliquidphase.3.3Symbols:Cd=thespecimentemperatureatwhichtheappearanceofthefirstcrystalsaredetectedinthespecimenbyanopticalcrystaldete...
