ASTM_D_6892_-_03_2014.pdf

Designation:D689203(Reapproved 2014)Standard Test Method forPour Point of Petroleum Products(Robotic Tilt Method)1This standard is issued under the fixed designation D6892;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 covers the determination of the pourpoint of petroleum products by an automatic instrument thattilts the test jar to detect movement of the surface of the testspecimen with an optical device,after being removed from aregulated,stepped-bath cooling jacket.1.2 This test method is designed to cover the range oftemperatures from 57 to+51C;however,the range oftemperatures included in the 1998 interlaboratory test programonly covered the temperature range from 51 to 11C.1.3 Test results from this test method can be determined ateither 1 or 3C testing intervals.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 the 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 Standard: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,n in 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 theconditions of the test.The preceding observation temperatureat which flow of the test specimen is last observed is the pourpoint.3.2.2 tilting,vttechnique of movement where the test jarin a vertical position is moved towards a horizontal position toinduce specimen movement.3.2.2.1 DiscussionWhen the test jar is tilted and held in ahorizontal position for 5 s without detection of movement ofthe surface of the specimen,this is the no-flow point and thetest is complete.4.Summary of Test Method4.1 After insertion of the specimen into the automatic pourpoint apparatus and initiation of the testing program,thespecimen is heated and then cooled according to a prescribedprofile.The specimen surface is examined periodically formovement using an optical camera system mounted on top ofthe specimen test jar,while tilting the specimen test jar.Thetest jar is removed from the jacketed cooling chamber prior toeach examination.The lowest temperature,when movement ofthe surface of the specimen is detected,is recorded as the pourpoint determined by this Test Method D6892.1This 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 2003.Last previous edition approved in 2008 as D689203(2008).DOI:10.1520/D6892-03R14.2For 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 5.Significance and Use5.1 The pour point of a petroleum product is an index of thelowest temperature of its utility for certain applications.Flowcharacteristics,such as pour point,can be critical for thecorrect operation of lubricating systems,fuel systems,andpipeline operations.5.2 Petroleum blending operations require precise measure-ment of the pour point.5.3 Test results from this test method can be determined ateither 1 or 3C intervals.5.4 This t