ASTM_D_5482_-_07_2013.pdf

Designation:D548207(Reapproved 2013)Standard Test Method forVapor Pressure of Petroleum Products(Mini MethodAtmospheric)1This standard is issued under the fixed designation D5482;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.Scope1.1 This test method covers a procedure for the determina-tion of total vapor pressure of petroleum products usingautomatic vapor pressure instruments.The test method issuitable for testing samples with boiling points above 0C(32F)that exert a vapor pressure between 7 and 110 kPa(1.0and 16 psi)at 37.8C(100F)at a vapor-to-liquid ratio of 4:1.The test method is applicable to gasolines containing oxygen-ates.No account is made of dissolved water in the sample.NOTE1Because the external atmospheric pressure does not influencethe resultant vapor pressure,this vapor pressure is an absolute pressure at37.8C(100F)in kPa(psi).This vapor pressure differs from the truevapor pressure of the sample due to some small vaporization of the sampleand dissolved air into the air of the confined space.1.1.1 Some gasoline-oxygenate blends may show a hazewhen cooled to 0 to 1C.If a haze is observed in 8.5,it shallbe indicated in the reporting of results.The precision and biasstatements for hazy samples have not been determined(seeNote 6).1.2 This test method is a modification of Test MethodD5191(Mini Method)in which the test chamber is at atmo-spheric pressure prior to sample injection.1.3 This test method covers the use of automated vaporpressure instruments that perform measurements on liquidsample sizes in the range from 1 to 10 mL.1.4 This test method is suitable for the determination of thedry vapor pressure equivalent(DVPE)of gasoline andgasoline-oxygenate blends by means of a correlation equation(see 13.2).The calculated DVPE is considered equivalent tothe result obtained on the same material when tested by TestMethod D4953.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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.(For specificwarning statements,see 7.2 through 7.7.)2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4953 Test Method for Vapor Pressure of Gasoline andGasoline-Oxygenate Blends(Dry Method)D5190 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)3.Terminology3.1 Definitions:3.1.1 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.3.1.2 gasoline-oxygenate blend,nspark-ignition enginefuel consisting primarily of gasoline with one or more oxygen-ates.3.1.3 oxygenate,noxygen-containing ashless organiccompound,such as an alcohol or ether,which may be used asa fuel or fuel supplement.D41753.1.4 platinum resistance thermometer,n temperaturemeasuring device with platinum wire,whose electrical resis-tance changes in relation to temperature.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.08 on Volatility.Current edition approved June 1,2013.Published August 2013.Originallyapproved in 1993.Last previous edition approved in 2007 as D5482 07.DOI:10.1520/D5482-07R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 total vapor pressure,nobserved pressure measuredin the experiment,that is the sum of the partial pressure of thesample and the partial pressure of the dissolved air.3.1.6 vapor pressure,npressure exerted by the vapor of aliquid when in equilibrium with the liquid.D41753.2 Abbreviations:3.2.1 DVPE,ndry vapor pressure equivalent.3.2.2 MTBE,nmethyl t-butyl ether.4.Summary of Test Method4.1 A known volume of chilled,air-saturated sample isintroduced into a thermostatically controlled test chamber,theinternal volume of which is five times that of the total testspecimen introduced into t