1、Designation:D637720Standard Test Method forDetermination of Vapor Pressure of Crude Oil:VPCRx(Expansion Method)1This standard is issued under the fixed designation D6377;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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 of cr
3、ude oils.This test method is suitable for testingsamples that exert a vapor pressure between 25 kPa and180 kPa at 37.8 C at vapor-liquid ratios from 4:1 and 0.02:1(X=4 and 0.02).NOTE1This test method is suitable for the determination of the vaporpressure of crude oils at temperatures from 0 C to 100
4、 C and pressuresup to 500 kPa,but the precision and bias statements(see Section 14)maynot be applicable.The current precision of the method is limited atvapor-liquid ratios of 0.02 and 4.(Section 14 is inclusive of vapor-liquidratios of 0.02 and 4).1.2 This test method also allows the determination
5、of vaporpressure for crude oil samples having pour points above 15 Cprovided the proper sample handling,transfer,and analysisprocedures are followed.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not p
6、urport 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 warning statements,
7、see 7.2.1 7.3.2.1.5 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 Organization Techn
8、icalBarriers to Trade(TBT)Committee.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)D3700 Practice for Obtaining LPG Samples Using a Float-ing Piston Cyli
9、nderD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5191 Test Method for Vapor Pressure of Petroleum Prod-ucts and Liquid Fuels(Mini Method)D5842 Practice for Sampling and Handling of Fuels forVolatility Me
10、asurementD5853 Test Method for Pour Point of Crude OilsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a MaterialD7975 Test Method for Determination of Vapor Pressure ofCrude Oil:VPCRx-F(TmC)(Manual E
11、xpansion FieldMethod)D8009 Practice for Manual Piston Cylinder Sampling forVolatile Crude Oils,Condensates,and Liquid PetroleumProducts3.Terminology3.1 Definitions:3.1.1 platinum resistance thermometer,ntemperaturemeasuring device constructed with a length of platinum wire,whose electrical resistanc
12、e changes in relation to temperature.3.1.2 vapor-liquid ratio(V/L),nthe ratio of the vaporvolume to the liquid volume of specimen,in equilibrium,underspecified conditions.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the dir
13、ect responsibility ofSubcommittee D02.08 on Volatility.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1999.Last previous edition approved in 2016 as D6377 16.DOI:10.1520/D6377-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Custome
14、r 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-
15、2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical
16、Barriers to Trade(TBT)Committee.3.2 Definitions of Terms Specific to This Standard:3.2.1 dead crude oil,ncrude oil with sufficiently lowvapor pressure that,when exposed to normal atmosphericpressure at room temperature,does not result in boiling of thesample.3.2.1.1 DiscussionSampling and handling of dead crudeoils can usually be done without loss of sample integrity orother problems by using normal,non-pressurized samplecontainers such as cans.3.2.2 live crude oil,ncrude oil with sufficiently h
