ASTM_D_323_-_20a.pdf

Designation:D32320aStandard Test Method forVapor Pressure of Petroleum Products(Reid Method)1This standard is issued under the fixed designation D323;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers procedures for the determina-tion of vapor pressure(see Note 1)of gasoline,volatile crudeoil,and other volatile petroleum products.1.2 Procedure A is applicable to gasoline and other petro-leum products with a vapor pressure of less than 180 kPa(26 psi).1.3 Procedure B may also be applicable to these othermaterials,but only gasoline was included in the interlaboratorytest program to determine the precision of this test method.1.4 Procedure C is for materials with a vapor pressure ofgreater than 180 kPa(26 psi).1.5 Procedure D for aviation gasoline with a vapor pressureof approximately 50 kPa(7 psi).NOTE1Because the external atmospheric pressure is counteracted bythe atmospheric pressure initially present in the vapor chamber,the Reidvapor pressure is an absolute pressure at 37.8 C(100 F)in kilopascals(pounds-force per square inch).The Reid vapor pressure differs from thetrue vapor pressure of the sample due to some small sample vaporizationand the presence of water vapor and air in the confined space.1.6 This test method is not applicable to liquefied petroleumgases or fuels containing oxygenated compounds other thanmethyl t-butyl ether(MTBE).For determination of the vaporpressure of liquefied petroleum gases,refer to Test MethodD1267 or Test Method D6897.For determination of the vaporpressure of gasoline-oxygenate blends,refer to Test MethodD4953.The precision for crude oil has not been determinedsince the early 1950s(see Note 3).Test Method D6377 hasbeen approved as a method for determination of vapor pressureof crude oil.IP 481 is a test method for determination of theair-saturated vapor pressure of crude oil.1.7 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.8This 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific warning statements are given in Sections 7 and 18,and12.5.3,15.5,21.2,A1.1.2,A1.1.6,and A2.3.1.9 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1267 Test Method for Gauge Vapor Pressure of LiquefiedPetroleum(LP)Gases(LP-Gas Method)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationD4953 Test Method for Vapor Pressure of Gasoline andGasoline-Oxygenate Blends(Dry Method)D5842 Practice for Sampling and Handling of Fuels forVolatility MeasurementD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6377 Test Method for Determination of Vapor Pressure ofCrude Oil:VPCRx(Expansion Method)D6897 Test Method for Vapor Pressure of Liquefied Petro-leum Gases(LPG)(Expansion Method)E1 Specification for ASTM Liquid-in-Glass Thermometers1This 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 Nov.1,2020.Published December 2020.Originallyapproved in 1930.Last previous edition approved in 2020 as D323 20.DOI:10.1520/D0323-20A.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 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