Designation:D1298−12b(Reapproved2017)ManualofPetroleumMeasurementStandards(MPMS),Chapter9.1StandardTestMethodforDensity,RelativeDensity,orAPIGravityofCrudePetroleumandLiquidPetroleumProductsbyHydrometerMethod1ThisstandardisissuedunderthefixeddesignationD1298;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthelaboratorydeterminationusingaglasshydrometerinconjunctionwithaseriesofcalculations,ofthedensity,relativedensity,orAPIgravityofcrudepetroleum,petroleumproducts,ormixturesofpetroleumandnonpetroleumproductsnormallyhandledasliquids,andhavingaReidvaporpressureof101.325kPa(14.696psi)orless.Valuesaredeterminedatexistingtemperaturesandcorrectedto15°Cor60°Fbymeansofaseriesofcalculationsandinternationalstandardtables.1.2Theinitialhydrometerreadingsobtainedareuncor-rectedhydrometerreadingsandnotdensitymeasurements.Readingsaremeasuredonahydrometerateitherthereferencetemperatureoratanotherconvenienttemperature,andreadingsarecorrectedforthemeniscuseffect,thethermalglassexpan-sioneffect,alternativecalibrationtemperatureeffectsandtothereferencetemperaturebymeansofthePetroleumMeasurementTables;valuesobtainedatotherthanthereferencetemperaturebeinghydrometerreadingsandnotdensitymeasurements.1.3Readingsdeterminedasdensity,relativedensity,orAPIgravitycanbeconvertedtoequivalentvaluesintheotherunitsoralternativereferencetemperaturesbymeansofInterconver-sionProcedures(APIMPMSChapter11.5),orAdjuncttoD1250GuideforPetroleumMeasurementTables(APIMPMSChapter11.1),orboth,ortables,asapplicable.1.4Theinitialhydrometerreadingsdeterminedinthelabo-ratoryshallberecordedbeforeperforminganycalculations.ThecalculationsrequiredinSection10shallbeappliedtotheinitialhydrometerreadingwithobserva...
