Designation:D2889−95(Reapproved2015)StandardTestMethodforCalculationofTrueVaporPressuresofPetroleumDistillateFuels1ThisstandardisissuedunderthefixeddesignationD2889;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethoddescribesthecalculationoftruevaporpressuresofpetroleumdistillatefuelsforwhichdistillationdatamaybeobtainedinaccordancewithTestMethodD86withoutreachingadecompositionpointpriortoobtaining90volume%distilled.1.2Thetestmethodmaybeusedtocalculatevaporpres-suresattemperaturesbetweenthe0%equilibriumflashtemperatureandthecriticaltemperatureofthefuel.Provisionisincludedforobtainingacalculatedcriticaltemperatureforfuelsforwhichitisnotknown.1.3Criticalpressure-temperaturedataareusuallynotavail-ableforpetroleumfuels.However,ifboththecriticalpressureandcriticaltemperatureareknown,thevaluesshallbeusedasthecoordinatesinFig.1toestablishacriticalpointtobeusedinsteadofthefocalpointestablishedasdescribedin6.5.4;andthecalculationsdescribedin6.5through6.5.4arenotrequired.Ifeitheradeterminedtrueboilingpointordeterminedequi-libriumflashvaporizationtemperatureat0%distilledatatmosphericpressureisknown,thedeterminedvalueshallbeusedtoestablishthelowerlimitofthebubble-pointlinereferredtoin6.4.1.4Themethodisnotreliablefordistillatefuelshavingaboilingrangeoflessthan100°F(38°C)betweentheTestMethodD8610volume%and90volume%distilledtem-peratures.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationsprio...
