ASTM_D_5950_-_14.pdf

Designation:D595014Standard Test Method forPour Point of Petroleum Products(Automatic Tilt Method)1This standard is issued under the fixed designation D5950;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 tilts thetest jar during cooling and detects movement of the surface ofthe test specimen with an optical device.1.2 This test method is designed to cover the range oftemperatures from 66 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 51 C to 11 C.(See Section 13.)1.3 Test results from this test method can be determined at1 C or 3 C 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 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: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 the prescribed conditions of this test method.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 the viscosityincrease,or both,has progressed to the point where the appliedobservation device no longer detects movement under theconditions of the test.The preceding observation temperature,at which flow of the test specimen is last observed,is the pourpoint.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 May 1,2014.Published June 2014.Originallyapproved in 1996.Last previous edition approved in 2012 as D5950 12a.DOI:10.1520/D5950-14.2For 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 3.2.2 tilting,vtechnique of movement where the test jar ina 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 specimenmovement,this is the no-flow point and the test is complete.4.Summary of Test Method4.1 After preliminary heating,the test specimen is insertedinto the automatic pour point apparatus.After starting theprogram,the specimen is cooled according to the coolingprofile listed in Table 1 and examined at either 1 C or 3 Cintervals.The lowest temperature at which movement ofspecimen is detected,by the automatic equipment,is displayedas the pour point.NOTE2If the automatic pour apparatuss preheat option is utilized,place the test specimen into the apparatus.After starting the program,theapparatus will automatically carry out the preliminary heating.5.Significance and Use5.1 The pour point of a petroleum product is an inde