ASTM_D_4953_-_15.pdf

Designation:D495315Standard 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 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 and is applicable to gasolinesand gasoline-oxygenate blends with a vapor pressure rangefrom 35 kPa to 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 initially 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 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 specified 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 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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific warningsare given in 7.5,8.4.1,8.5.1,9.1,A1.1,and A1.1.3.2.Referenced Documents2.1 ASTM Standards:2D323 Test Method for Vapor Pressure of Petroleum Products(Reid Method)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD5190 Test Method for Vapor Pressure of Petroleum Prod-ucts(Automatic Method)(Withdrawn 2012)3D5191 Test Method for Vapor Pressure of Petroleum Prod-ucts(Mini Method)E1 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 straightens under internal pressure.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 vapor pressure equivalent(DVPE),nvalue cal-culated by a defined correlation equation,that is expected to becomparable to the vapor pressure value obtained by TestMethod D4953,Procedure A.3.1.5 oxygenate,noxygen-containing ashless organiccompound,such as an alcohol or ether,which may be used asa fuel or fuel supplement.D41753.1.6 vapor pressure,npressure exerted by the vapor of aliquid when in equilibrium with the liquidD41751This 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 June 1,2015.Published June 2015.Originallyapproved in 1989.Last previous edition approved in 2012 as D4953 06(2012).DOI:10.1520/D4953-15.2For 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.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 States1 3.2 Abbreviations:3.2.1 DVPE,ndry vapor pressure equivalent4.Summary of Test Method4.1 The liquid chamber of the vapor pressure apparatus isfilled with the chilled sample and connected to the vaporchamber at 37.8 C(100 F).The apparatus is immersed in abath at 37.8 C(100 F)until a constant pressure is observed.The pressure reading,suitably corrected,is reported as thevapor pressure.4.2 Procedure A utilizes the same apparatus and essentiallythe same procedure as Test Method D323 with the exceptionthat the interior surfaces of the liquid and vapor chamber