ASTM_D_5949_-_16.pdf

Designation:D594916Standard Test Method forPour Point of Petroleum Products(Automatic PressurePulsing Method)1This standard is issued under the fixed designation D5949;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.Scope*1.1 This test method covers the determination of pour pointof petroleum products by an automatic instrument that appliesa controlled burst of nitrogen gas onto the specimen surfacewhile the specimen is being cooled and detects movement ofthe surface of the test specimen with an optical device.1.2 This test method is designed to cover the range oftemperatures from 57 C to+51 C.However,the range oftemperatures included in the 1992 interlaboratory test programonly covered the temperature range from 39 C to+6 C andthe range of temperatures included in the 1998 interlaboratorytest program was from 51 C to 11 C.(see 13.4).1.3 Test results from this test method can be determined at1 C or 3 C testing intervals.1.4 This test method is not intended for use with crude oils.NOTE1The applicability of this test method or 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 ProductsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material2.2 Energy Institute Standard:IP 15 Test Method for Pour Point of Petroleum Products33.Terminology3.1 Definitions:3.1.1 pour point,nin petroleum products,the lowesttemperature at which movement of the test specimen isobserved under the prescribed conditions of the 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.3.2.1.1 DiscussionThe no-flow point occurs when,uponcooling,the formation of wax crystal structures or viscosityincrease,or both,has progressed to the point where the appliedobservation device no longer detects movement under the1This 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 April 1,2016.Published May 2016.Originallyapproved in 1996.Last previous edition approved in 2014 as D5949 14.DOI:10.1520/D5949-16.2For 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.*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 conditions of the test.The preceding observation temperature,at which flow of the test specimen is last observed,is the pourpoint.3.2.2 pulse,na controlled burst of nitrogen gas of a fixedpressure and flow rate sufficient to cause movement on thesurface of the test specimen without fracturing the waxstructure which may be formed in the specimen.3.2.3 Peltier device,na solid-state thermoelectric deviceconstructed with dissimilar semiconductor materials,config-ured in such a way that it will transport heat to or away froma test specimen dependent on the direction of electric currentapplied to the device.4.Summary of Test Method4.1 After inserting the test specimen into the automatic pourpoint apparatus,and initiation of the test program,the testspecimen is heated and then cooled by a Peltier device at a rateof 1.5 Cmin 6 0.1 C min.At temperature intervals of 1 Cor 3 C,depending on the selection made by the user,a movingforce in the form of a pressurized pulse of compressed gas isimparted onto the surface of the specimen.Mu