1、Designation:D382920aStandard Test Method forPredicting the Borderline Pumping Temperature of EngineOil1This standard is issued under the fixed designation D3829;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.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 prediction of the borderlinepumping temperature(BPT)of engine oils through the use ofa 16 h cooling cycle
3、over the temperature range from 0 C to40 C.The precision is stated for temperatures from 34 C to15 C.1.2 Applicability to petroleum products other than engineoils has not been determined.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thi
4、sstandard.1.3.1 ExceptionThis test method uses the SI based unit ofmilliPascal second(mPas)for viscosity,which is equivalent tocentipoise(cP).1.4 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
5、 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princip
6、les for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:D8278 Specification for Digital Contact Thermometers forTest Methods Measuring Flow Properties of Fue
7、ls andLubricantsE563 Practice for Preparation and Use of an Ice-Point Bathas a Reference Temperature2.2 ISO Standards:2ISO 17025 General requirements for the competence oftesting and calibration laboratoriesISO Guide 34 General requirements for the competence ofreference material producers3.Terminol
8、ogy3.1 Definitions:3.1.1 apparent viscosity,nthe determined viscosity ob-tained by use of this test method.3.1.2 digital contact thermometer(DCT),nan electronicdevice consisting of a digital display and associated tempera-ture sensing probe.3.1.2.1 DiscussionThis device consists of a temperaturesens
9、or connected to a measuring instrument;this instrumentmeasures the temperature-dependent quantity of the sensor,computes the temperature from the measured quantity,andprovides a digital output.This digital output goes to a digitaldisplay and/or recording device that may be internal or externalto the
10、 device.3.1.2.2 DiscussionThe devices are often referred to as a“digital thermometers,”however the term includes devices thatsense temperature by means other than being in physicalcontact with the media.3.1.2.3 DiscussionPET is an acronym for portable elec-tronic thermometers,a subset of digital con
11、tact thermometers(DCT).3.1.3 Newtonian oil or fluid,nan oil or fluid that at a giventemperature exhibits a constant viscosity at all shear rates orshear stresses.3.1.4 non-Newtonian oil or fluid,nan oil or fluid that at agiven temperature exhibits a viscosity that varies with chang-ing shear stress
12、or shear rate.3.1.5 viscosity,nthe ratio between the applied shear stressand rate of shear which is sometimes called the coefficient ofdynamic viscosity and is a measure of the resistance to flow ofthe liquid.3.2 Definitions of Terms Specific to This Standard:1This test method is under the jurisdict
13、ion of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Nov.1,2020.Published November 2020.Originallyapproved in 1979.Last previous edition approved in 2020 as D3829 20.DOI:10.1520/D
14、3829-20A.2Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*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 Sta
15、tesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Tra
16、de(TBT)Committee.13.2.1 borderline pumping temperature,nthe maximumtemperature at which the critical yield stress or critical viscos-ity occurs,whichever is the higher temperature.3.2.2 calibration oils,nthose oils for establishing theinstruments reference framework of apparent viscosity versusspeed from which the apparent viscosities of test oils aredetermined.3.2.3 critical viscosity,nthe maximum viscosity at adefined shear rate to allow adequate flow of oil to the oil pumpin an automotive eng
