Designation:D7961−17StandardPracticeforCalibratingU-tubeDensityCellsoverLargeRangesofTemperatureandPressure1ThisstandardisissuedunderthefixeddesignationD7961;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThispracticeoutlinesproceduresforthecalibrationofU-tubedensitycells.Itisapplicabletoinstrumentscapableofdeterminingfluiddensityattemperaturesintherange–10°Cto200°Candpressuresfromjustgreaterthanthesaturationpressureto140MPa.Thepracticereferstodensitycellsastheyareutilizedtomakemeasurementsoffluidsprimarilyinthecompressed-liquidstate.ExamplesofsubstancesforwhichthedensitycanbedeterminedwithacalibratedU-tubedensitymeterinclude:crudeoils,gasolineandgasoline-oxygenateblends,dieselandjetfuels,hydraulicfluids,andlubricatingoils.1.2Thispracticespecifiesaprocedureforthedeterminationoftheexpandeduncertaintyofthedensitymeasurement.1.3Thispracticepertainstofluidswithviscosities<1Pa·s(1000centipoise)atambientconditions.1.44ThevalueslistedinSIunitsareregardedasthestandard,unlessotherwisestated.TheSIunitformassdensityiskilogramspercubicmetre(kg·m-3)andcanbegivenasgramspercubiccentimetre(g·cm-3).1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD4052TestMethodforDensity,RelativeDensity,andAPIGravityofLiquidsbyDigitalDensityMeterD5002TestMethodforDensityandRelativeDensityofCrudeOilsbyDigitalDensityAnalyzerD6792PracticeforQualitySysteminPetroleumProductsandLubricantsTestingLaboratoriesD7483TestMethodforDeterminationofDynamicViscosityandDerivedKinematicViscosityofLiquidsbyOscillat-ingPistonViscome...
