Designation:D5949−16(Reapproved2022)StandardTestMethodforPourPointofPetroleumProducts(AutomaticPressurePulsingMethod)1ThisstandardisissuedunderthefixeddesignationD5949;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThistestmethodcoversanalternativeprocedureforthedeterminationofpourpointofpetroleumproductsusinganautomaticapparatus.1.Scope1.1Thistestmethodcoversthedeterminationofpourpointofpetroleumproductsbyanautomaticinstrumentthatappliesacontrolledburstofnitrogengasontothespecimensurfacewhilethespecimenisbeingcooledanddetectsmovementofthesurfaceofthetestspecimenwithanopticaldevice.1.2Thistestmethodisdesignedtocovertherangeoftemperaturesfrom−57°Cto+51°C.However,therangeoftemperaturesincludedinthe1992interlaboratorytestprogramonlycoveredthetemperaturerangefrom−39°Cto+6°Candtherangeoftemperaturesincludedinthe1998interlaboratorytestprogramwasfrom−51°Cto−11°C.(see13.4).1.3Testresultsfromthistestmethodcanbedeterminedat1°Cor3°Ctestingintervals.1.4Thistestmethodisnotintendedforusewithcrudeoils.NOTE1—Theapplicabilityofthistestmethodorresidualfuelsampleshasnotbeenverified.Forfurtherinformationonapplicability,referto13.4.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(...
