ASTM_D_5985_-_02_2014.pdf

Designation:D598502(Reapproved 2014)Standard Test Method forPour Point of Petroleum Products(Rotational Method)1This standard is issued under the fixed designation D5985;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.INTRODUCTIONThis test method covers an alternative procedure for the determination of pour point of petroleumproducts using an automatic apparatus.1.Scope1.1 This test method covers the determination of pour pointof petroleum products by an automatic instrument that con-tinuously rotates the test specimen against a suspended detec-tion device during cooling of the test specimen.1.2 This test method is designed to cover the range oftemperatures from 57 to+51C;however,the range oftemperatures included in the 1992 interlaboratory programonly covered the temperature range of 39 to+6C(see 13.4).1.3 This test method determines the no-flow point of petro-leum products by detection of the crystal structure or viscosityincrease,or both,in the sample that is sufficient to impede flowof the specimen.1.4 This test method is not intended for use with crude oils.NOTE1The applicability of this test method on residual fuel sampleshas not been verified.For further information on applicability,refer to13.4.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2D97 Test Method for Pour Point of Petroleum ProductsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products2.2 Energy Institute Standards:3IP 15 Test Method for Pour Point of Petroleum Products3.Terminology3.1 Definitions:3.1.1 pour point,nin petroleum products,the lowesttemperature at which movement of the test specimen isobserved under prescribed conditions of test.3.2 Definitions of Terms Specific to This Standard:3.2.1 no-flow point,nin petroleum products,the tempera-ture of the test specimen at which a wax crystal structure orviscosity increase,or both,impedes movement of the surfaceof the test specimen under the conditions of the test.3.2.2 DiscussionThe no-flow point occurs when,uponcooling,the formation of wax crystal structures or viscosityincrease,or both,have progressed to the point where theapplied observation device no longer detects movement underthe conditions of the test.The preceding observationtemperature,at which flow of the test specimen is lastobserved,is the pour point.3.2.3 pour point at 3C testing intervals,nin petroleumproducts,the temperature calculated by rounding the no-flowpoint of the test specimen to the next higher integer which is amultiple of 3C.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1996.Last previous edition approved in 2008 as D598502(2008).DOI:10.1520/D5985-02R14.2For 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 Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.uk.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.4 DiscussionThe no-flow point can be measured witha resolution of 0.1C in this test method.In Test Method D97observations for no-flow are in 3C intervals and when resultswith a similar format to Test Method D97 are required,thiscalculation shall be performed.Some apparatus can performthis calculation automatically.3.2.5 rotational,nin this standard,the technique of turn-ing the test specimen jar in an upright position upon a turntablewith a stationary positioned,temperature sensor containingpendulum,inserted into the test specimen.3.2.6 DiscussionUpon cooling of the test specimen,theresultant crystal formation or viscosity increase in the speci-men exerts force upon the pendulum,offsetting the stationaryposition and causing detection of the no-flow point.4.Summary of Test Method4.1 After inserting the test specimen into the automatic pourpoint apparatus,and initiation of the program,the test speci-men is heated and then cooled by maintaining a constanttemperature differential betwe