ASTM_D_6378_-_10.pdf

Designation:D637810Standard Test Method forDetermination of Vapor Pressure(VPX)of PetroleumProducts,Hydrocarbons,and Hydrocarbon-OxygenateMixtures(Triple Expansion Method)1This standard is issued under the fixed designation D6378;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the use of automated vaporpressure instruments to determine the vapor pressure exerted invacuum by volatile,liquid petroleum products,hydrocarbons,and hydrocarbon-oxygenate mixtures.This test method issuitable for testing samples with boiling points above 0C(32F)that exert a vapor pressure between 7 and 150 kPa(1.0and 21 psi)at 37.8C(100F)at a vapor-to-liquid ratio of 4:1.The liquid sample volume size required for analysis is depen-dent upon the vapor-to-liquid ratio chosen(see Note 1)and themeasuring chamber volume capacity of the instrument(see6.1.1 and Note 3).NOTE1The test method is suitable for the determination of the vaporpressure of volatile,liquid petroleum products at temperatures from 0 to100C at vapor to liquid ratios of 4:1 to 1:1(X=4 to 1)and pressures upto 500 kPa(70 psi),but the precision statement(see Section 16)may notbe applicable.1.2 This test method also covers the use of automated vaporpressure instruments to determine the vapor pressure exerted invacuum by aviation turbine fuels.This test method is suitablefor testing aviation turbine fuel samples with boiling pointsabove 0C(32F)that exert a vapor pressure between 0 and110 kPa(0 and 15.5 psi)at a vapor-to-liquid ratio of 4:1,in thetemperature range from 25 to 100C(77 to 212F).1.3 The vapor pressure(VPX)determined by this testmethod at a vapor-liquid ratio of 4:1(X=4)of gasoline andgasoline-oxygenate blends at 37.8C can be correlated to thedry vapor pressure equivalent(DVPE)value determined byTest Method D5191(see 16.3).This condition does not applywhen the sample is aviation turbine fuel.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificwarning statements,see 7.2 7.8.2.Referenced Documents2.1 ASTM Standards:2D323 Test Method for Vapor Pressure of Petroleum Products(Reid Method)D2892 Test Method for Distillation of Crude Petroleum(15-Theoretical Plate Column)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4953 Test Method for Vapor Pressure of Gasoline andGasoline-Oxygenate Blends(Dry Method)D5191 Test Method for Vapor Pressure of Petroleum Prod-ucts(Mini Method)D5842 Practice for Sampling and Handling of Fuels forVolatility MeasurementD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material3.Terminology3.1 Definitions of Terms Specific to This Standard:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.08 on Volatility.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1999.Last previous edition approved in 2008 as D637808.DOI:10.1520/D6378-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 dry vapor pressure equivalent(DVPE)a value cal-culated by a correlation equation from the total pressure(TestMethod D5191),which is equivalent to the value obtained onthe sample by Test Method D4953,Procedure A.3.1.2 partial pressure from dissolved air(PPA),nthepressure exerted in vacuum from dissolved air that escapesfrom the liquid phase into the vapor phase.3.1.3 Reid vapor pressure equivalent(RVPE)a value cal-culated by a correlation equation from the TPX,which isequivalent to the value obtained