1、Designation:D637820Standard 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 of
2、original 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 instru
3、ments to determine the vapor pressure exerted invacuum by volatile,liquid petroleum products,hydrocarbons,and hydrocarbon-oxygenate mixtures including ethanol blendsup to 85%(volume fraction).This test method is suitable fortesting samples with boiling points above 0 C(32 F)thatexert a vapor pressur
4、e between 7 kPa and 150 kPa(1.0 psi and21 psi)at 37.8 C(100 F)at a vapor-to-liquid ratio of 4:1.Theliquid sample volume size required for analysis is dependentupon the vapor-to-liquid ratio chosen(see Note 1)and themeasuring chamber volume capacity of the instrument(see6.1.1 and Note 5).NOTE1The tes
5、t method is suitable for the determination of the vaporpressure of volatile,liquid petroleum products at temperatures from 0 Cto 100 C at vapor to liquid ratios of 4:1 to 1:1(X=4 to 1)and pressuresup to 500 kPa(70 psi),but the precision statement(see Section 16)maynot be applicable.NOTE2The precisio
6、n(see Section 16)using 1 L containers wasdetermined in a 2003 interlaboratory study(ILS);2the precision using250 mL containers was determined in a 2016 ILS.31.2 This test method also covers the use of automated vaporpressure instruments to determine the vapor pressure exerted invacuum by aviation tu
7、rbine fuels.This test method is suitablefor testing aviation turbine fuel samples with boiling pointsabove 0 C(32 F)that exert a vapor pressure between 0 kPaand 110 kPa(0 psi and 15.5 psi)at a vapor-to-liquid ratio of4:1,in the temperature range from 25 C to 100 C(77 F to212 F).NOTE3The precision(se
8、e Section 16)for aviation turbine fuels using100 mL containers was determined in a 2007 ILS.41.3 The vapor pressure(VPX)determined by this testmethod at a vapor-liquid ratio of 4:1(X=4)of gasoline andgasoline-oxygenate blends at 37.8 C can be correlated to thedry vapor pressure equivalent(DVPE)value
9、 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 asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.5 This sta
10、ndard 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific war
11、ning statements,see 7.2 7.8.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organi
12、zation TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:5D323 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 andPetrole
13、um ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products1This 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 May 1,20
14、20.Published May 2020.Originallyapproved in 1999.Last previous edition approved in 2018 as D6378 18a.DOI:10.1520/D6378-20.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1619.ContactASTM CustomerService at serviceastm.org.3R
15、esearch Report IP 394(EN 130161)and IP 619(EN 130163)2016,available from the Energy Institute,61 New Cavendish Street,London W1G 7AR,UK,email:ILSenergyinst.org.4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1651.ContactASTM
16、 CustomerService at serviceastm.org.5For 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 StatesThis international standard was developed in accordance w
