1、Designation:D495320Standard Test Method forVapor Pressure of Gasoline and Gasoline-Oxygenate Blends(Dry Method)1This standard is issued under the fixed designation D4953;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 and is applicable to gasolinesand gasoline-oxygenate blends with a vapor pressure rangefrom 35 kPa to
3、 100 kPa(5 psi to 15 psi)(see Note 2).This testmethod,a modification of Test Method D323(Reid Method),provides two procedures to determine the vapor pressure(Note1)of gasoline and gasoline-oxygenate blends.NOTE1Because the external atmospheric pressure is counteracted bythe atmospheric pressure init
4、ially present in the air chamber,this vaporpressure is an absolute pressure at 37.8 C(100 F)in kilopascals(pounds-force per square inch).This vapor pressure differs from the truevapor pressure of the sample due to some small vaporization of the sampleand air in the confined space.NOTE2Vapor pressure
5、 of gasoline or gasoline-oxygenate blendsbelow 35 kPa(5 psi)or greater than 100 kPa(15 psi)can be determinedwith this test method but the precision and bias(Section 11)do not apply.For materials with a vapor pressure greater than 100 kPa(15 psi),use a0 kPa to 200 kPa(0 psi to 30 psi)gauge as specifi
6、ed in the annex of TestMethod D323.1.2 Some gasoline-oxygenate blends may show a haze whencooled to 0 C to 1 C.If a haze is observed in 9.4,it shall beindicated in the reporting of results.The precision and biasstatements for hazy samples have not been determined(seeNote 7).1.3 The values stated in
7、SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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,health,and envir
8、onmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific warnings are given in 7.5,8.4.1,8.5.1,9.1,A1.1,andA1.1.3.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the
9、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:2D323 Test Method for Vapor Pressure of Petroleum Products(Reid Method)D4057 Pract
10、ice 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 ContaminationD519
11、0 Test Method for Vapor Pressure of Petroleum Prod-ucts(Automatic Method)(Withdrawn 2012)3D5191 Test Method for Vapor Pressure of Petroleum Prod-ucts and Liquid Fuels(Mini Method)D5842 Practice for Sampling and Handling of Fuels forVolatility MeasurementD5854 Practice for Mixing and Handling of Liqu
12、id Samplesof Petroleum and Petroleum ProductsE1 Specification for ASTM Liquid-in-Glass Thermometers3.Terminology3.1 Definitions:3.1.1 Bourdon spring gauge,npressure measuring devicethat employs a bourdon tube connected to an indicator.3.1.2 Bourdon tube,nflattened metal tube bent to a curvethat stra
13、ightens under internal pressure.1This test method is under the jurisdiction of Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.08 on Volatility.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 1989.Last
14、previous edition approved in 2015 as D4953 15.DOI:10.1520/D4953-20.2For 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
15、.3The last approved version of this historical standard is referenced onwww.astm.org.*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
16、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 Barriers to Trade(TBT)Committee.3.1.3 dry method,nin vapor pressure methods,a specificempirical test method(D4953)for measuring the vapor pres-sure of gasoline and other volatile products in which contact ofthe test specimen with water is not allowed.3.1.4 dry