ASTM_D_5190_-_07.pdf

Designation:D5190 07Standard Test Method forVapor Pressure of Petroleum Products(Automatic Method)1This standard is issued under the fixed designation D5190;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 the determination of the totalvapor pressure of air-containing,volatile,petroleum products.This test method is suitable for testing samples with boilingpoints above 0C(32F)that exert a vapor pressure between 7and 172 kPa(1 and 25 psi)at 37.8C(100F)at a vapor-to-liquid ratio of 4:1.This test method is suitable for testinggasoline samples that contain oxygenates.No account is madeof dissolved water in the sample.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 8).1.2 This test method is suitable for the calculation of a dryvapor pressure equivalent(DVPE)by means of a correlationequation(see 13.1).The calculated DVPE very closely ap-proximates the dry vapor pressure that would be obtained onthe same material when tested in accordance with Test MethodD4953.1.3 The values stated in SI units are to be regarded as thestandard.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.For specific hazardstatements,see 7.3 through 7.5 and 9.2.2.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)D5191 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 total vapor pressure,nthe observed pressure mea-sured in the experiment,that is,the sum of the partial pressureof the sample and the partial pressure of the dissolved air.3.1.5 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 The chilled sample cup of the automatic vapor pressureinstrument is filled with chilled sample and is coupled to theinstrument inlet fitting.The sample is then automaticallyforced from the sample chamber to the expansion chamberwhere it is held until thermal equilibrium at 37.8C(100F)isreached.In this process the sample is expanded to five times itsvolume(4:1 vapor-to-liquid ratio).The vapor pressure ismeasured by a pressure transducer.4.2 The measured vapor pressure is automatically convertedto a DVPE value by the instrument.A correction to this valueis necessary to account for the observed bias between the testresult and that obtained by Test Method D4953.1This 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 Nov.1,2007.Published January 2008.Originallyapproved in 1991.Last previous edition approved in 2001 as D519001.DOI:10.1520/D5190-07.2For 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.5.Significance and Use5.1 Vapor pressure is an important physical property ofvolatile liquids.5.2 The vapor pressure of gasoline and gasoline-oxygenateblends is regulated by various government agencies.5.3 Specifications for volatile petroleum products generallyinclude vapor pressure limits to ensure products of suitablevolatility performance.5.4 This test method is more precise than Test MethodD4953.6.Apparatus6.1 Automatic Vapor Pressure Instrument,3the essent