1、Designation:D250017aBritish Standard 4458Standard Test Method forCloud Point of Petroleum Products and Liquid Fuels1This standard is issued under the fixed designation D2500;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers only petrole
3、um products andbiodiesel fuels that are transparent in layers 40 mm inthickness,and with a cloud point below 49 C.NOTE1The interlaboratory program consisted of petroleum productsof Test Method D1500 color of 3.5 and lower.The precisions stated in thistest method may not apply to samples with ASTM co
4、lor higher than 3.5.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 WARNINGMercury has been designated by manyregulatory agencies as a hazardous material that can causecentral nervous system,kidney and liver damage.Mercur
5、y,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information.Users sh
6、ould be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.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 establish appro-priat
7、e safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Section 7.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in
8、the Decision on Principles 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:2D1500 Test Method for ASTM Color of Petroleum Products(ASTM Color Scale)D6300
9、 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD7962 Practice for Determination of Minimum ImmersionDepth and Assessment of Temperature Sensor Measure-ment DriftE1 Specification for ASTM Liquid-in-Glass ThermometersE644 Test Methods
10、for Testing Industrial Resistance Ther-mometersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision LiquidsE2877 Guide for Digital Contact Thermometers2.2 Energy Institute Standard:3Specifications for IP Standard Thermometers3.Terminology3.1 Definitions:3.1.1digital c
11、ontact thermometer(DCT),nan electronicdevice consisting of a digital display and associated tempera-ture sensing probe.3.1.1.1 DiscussionThis device consists of a temperaturesensor connected to a measuring instrument;this instrumentmeasures the temperature-dependent quantity of the sensor,computes t
12、he 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 device.These devices are referred to as“digitalthermometers.”3.1.1.2 DiscussionPET is an acronym for portable elec-tronic
13、 thermometers,a subset of digital contact thermometers(DCT).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 Dec.1,2017.Published Janua
14、ry 2018.Originallyapproved in 1966.Last previous edition approved in 2017 as D2500 17.DOI:10.1520/D2500-17A.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
15、 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 19428-2
16、959.United StatesThis 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 Trade(TBT)Committee.1 3.2 Definitions of Terms Specific to This Standard:3.2.1 biodiesel,na fuel comprised of mono-alkyl esters oflong chain fatty acids derived from vegetable oils or anima
