ASTM_D_2502_-_14.pdf

Designation:D250214Standard Test Method forEstimation of Mean Relative Molecular Mass of PetroleumOils from Viscosity Measurements1This standard is issued under the fixed designation D2502;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 estimation of the meanrelative molecular mass of petroleum oils from kinematicviscosity measurements at 100 F and 210 F(37.78 C and98.89 C).2It is applicable to samples with mean relativemolecular masses in the range from 250 to 700 and is intendedfor use with average petroleum fractions.It should not beapplied indiscriminately to oils that represent extremes ofcomposition or possess an exceptionally narrow mean relativemolecular mass range.1.2 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.1.3 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:3D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D7042 Test Method for Dynamic Viscosity and Density ofLiquids by Stabinger Viscometer(and the Calculation ofKinematic Viscosity)2.2 ASTM Adjuncts:Mean Relative Molecular Mass of Petroleum Oils fromViscosity Measurements43.Summary of Test Method3.1 The kinematic viscosity of the oil is determined at100 F and 210 F(37.78 C and 98.89 C).A function“H”ofthe 100 F viscosity is established by reference to a tabulationof H function versus 100 F viscosity.The H value and the210 F viscosity are then used to estimate the mean relativemolecular mass from a correlation chart.4.Significance and Use4.1 This test method provides a means of calculating themean relative molecular mass of petroleum oils from anotherphysical measurement.4.2 Mean relative molecular mass is a fundamental physicalconstant that can be used in conjunction with other physicalproperties to characterize hydrocarbon mixtures.5.Procedure5.1 Determine the kinematic viscosity of the oil at 100 Fand 210 F(37.78 C and 98.89 C)as described in TestMethod D445 or Test Method D7042.5.2 Look in Table 1 for 100 F(37.78 C)viscosity and readthe value of H that corresponds to the measured viscosity.Linear interpolation between adjacent columns may be re-quired.5.3 Read the viscositymean relative molecular mass chartfor H and 210 F(98.89 C)viscosity.A simplified version ofthis chart is shown in Fig.1 for illustration purposes only(Note1).Interpolate where necessary between adjacent lines of210 F viscosity.After locating the point corresponding to thevalue of H(ordinate)and the 210 F viscosity(superimposedlines),read the mean relative molecular mass along theabscissa.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0K on Correlative Methods.Current edition approved May 1,2014.Published June 2014.Originallyapproved in 1966.Last previous edition approved in 2009 as D2502 04(2009).DOI:10.1520/D2502-14.2Hirschler,A.E.,Journal of the Institute of Petroleum,JIPEA,Vol 32,1946,p.133.3For 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.4Available from ASTM International Headquarters.Order Adjunct No.ADJD2502.*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 TABLE 1 Tabulation of HFunctionKinematicViscosity,cSt at 100 F(37.78 C)H00.20.40.60.82178151126104853675238251341919283654452596673679859096101710611111612012481281321361401449147151154157160101631661691721751117818018318518812190192195197199132012032062082101421121321521721915221222224226227162292312322342351723723824024124318244245247248249192512522532552562025725825926126221263264265266267222692702712722732327427527627727824279280281281282252832842852862872628828928929029127292293294294295282962972982982992930030130130230330304304305306306313073083083093103231031131231231333314314315316316343173173183193193532032032132232236323323324325325373263263273273283832832932933033139331332332333333H012345678940334336339341343345347349352354503553573593613633643663683693716037237437537737838038138238438570386387388390391392393