ASTM_D_2889_-_95_2015.pdf

Designation:D288995(Reapproved 2015)Standard Test Method forCalculation of True Vapor Pressures of Petroleum DistillateFuels1This standard is issued under the fixed designation D2889;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 describes the calculation of true vaporpressures of petroleum distillate fuels for which distillationdata may be obtained in accordance with Test Method D86without reaching a decomposition point prior to obtaining 90volume%distilled.1.2 The test method may be used to calculate vapor pres-sures at temperatures between the 0%equilibrium flashtemperature and the critical temperature of the fuel.Provisionis included for obtaining a calculated critical temperature forfuels for which it is not known.1.3 Critical pressure-temperature data are usually not avail-able for petroleum fuels.However,if both the critical pressureand critical temperature are known,the values shall be used asthe coordinates in Fig.1 to establish a critical point to be usedinstead of the focal point established as described in 6.5.4;andthe calculations described in 6.5 through 6.5.4 are not required.If either a determined true boiling point or determined equi-librium flash vaporization temperature at 0%distilled atatmospheric pressure is known,the determined value shall beused to establish the lower limit of the bubble-point linereferred to in 6.4.1.4 The method is not reliable for distillate fuels having aboiling range of less than 100 F(38 C)between the TestMethod D86 10 volume%and 90 volume%distilled tem-peratures.1.5 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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.2.Referenced Documents2.1 ASTM Standards:2D86 Test Method for Distillation of Petroleum Products atAtmospheric PressureD287 Test Method for API Gravity of Crude Petroleum andPetroleum Products(Hydrometer Method)2.2 ASTM Adjuncts:Temperature Pressure Conversion Chart(16 by 20 in.draw-ings)33.Summary of Test Method3.1 Equilibrium flash vaporization(EFV)temperatures arecalculated from distillation data(Test Method D86)determinedon the sample.The distillation data,calculated EFV data,andAPI gravity of the sample are used with a graphical correlationprocedure to obtain two pairs of temperature-pressure coordi-nates through which the bubble-point line of the phase diagramfor the sample may be drawn.The calculated true vaporpressure at a specified temperature is obtained by reading thepressure at the intersection of the bubble-point line andspecified temperature.NOTE1Details of the procedure and data substantiating its validity forestablishing equilibrium flash vaporization temperatures have been pub-lished.44.Significance and Use4.1 The true vapor pressure of a distillate fuel is a relativemeasurement,both of the tendency of the most volatile portionof the fuel to gasify,and of the restraining pressure required toprevent gasification of the most volatile portion.Thus themeasurement is of importance when a fuel is to be utilized inapplications where no gasification may be tolerated,and1This test method is under jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.04.0K on Correlative Methods.Current edition approved Oct.1,2015.Published December 2015.Originallyapproved in 1970.Last previous edition approved in 2010 as D2889 95(2010).DOI:10.1520/D2889-95R15.2For 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.3Available from ASTM International Headquarters.Order Adjunct No.ADJD2889.Original adjunct produced in 1987.4Edmister,W.C.,andOkamoto,K.K.,“AppliedHydrocarbonThermodynamics,Part 12:Equilibrium Flash Vaporization Correlations for Petro-leum Fractions,”Petroleum Refiner,PEREA,Vol 38,No.8,1959,p.117.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 temperature-pressure conditions are expected to be near thetrue vapor pressure of the fuel.5.Data Requirements5.1 Distillation temperatures at the initial boiling point(IBP)and 10 volume%,30 volume%,50 volume%,70volume%,and 90 volume%distilled obtained in accordancewith Test Method D86.5.2