Designation:D1267−12StandardTestMethodforGageVaporPressureofLiquefiedPetroleum(LP)Gases(LP-GasMethod)1ThisstandardisissuedunderthefixeddesignationD1267;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthegagevaporpressuresofliquefiedpetroleumgasproducts(Warning—Flammablegas.Harmfulwheninhaled.)attem-peraturesof37.8°C(100°F)uptoandincludingatesttemperatureof70°C(158°F).1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see1.1andAnnexA2.2.ReferencedDocuments2.1ASTMStandards:2D323TestMethodforVaporPressureofPetroleumProducts(ReidMethod)D1265PracticeforSamplingLiquefiedPetroleum(LP)Gases,ManualMethod3.Terminology3.1Definitions:3.1.1liquefiedpetroleumgases,n—narrowboilingrangehydrocarbonmixturesconsistingmainlyofpropaneorpropylene,orboth,andbutanesorbutylenes,orboth,pluslimitedamountsofotherhydrocarbonsandnaturallyoccurringnon-hydrocarbons.3.1.2vaporpressure,n—thepressureexertedbythevaporofaliquidwheninequilibriumwiththeliquid.4.SummaryofTestMethod4.1Thetestapparatus,consistingoftwointerconnectedchambersandequippedwithasuitablepressuregage,ispurgedwithaportionofthesamplewhichisthendiscarded.Theapparatusisthenfilledcompletelywiththeportionofthesampletobetested.Thirty-threeandone-thirdtofortyvolumepercentofthesamplecontentoftheapparatusisimmediatelywithdrawntoprovideadequatefreespaceforproductexpan-sion.Theapparatusisthenimmersedinawaterbathmain-tainedatthestandardtesttemperatureof37.8°C(10...
