1、Designation:D768917Standard Test Method forCloud Point of Petroleum Products and Liquid Fuels(MiniMethod)1This standard is issued under the fixed designation D7689;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 determination of the cloudpoint of petroleum products,biodiesel,and biodiesel blendsthat are transparen
3、t in layers 40 mm in thickness,using anautomatic instrument.1.2 This test method covers the range of cloud pointtemperatures from 50 C to+6 C.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport
4、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.1.5 This international standard was developed in acco
5、r-dance with internationally recognized principles on standard-ization established in 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 St
6、andards:2D2500 Test Method for Cloud Point of Petroleum Productsand Liquid FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement
7、Between Two Test Methods thatPurport to Measure the Same Property of a Material2.2 Energy Institute Standard:3IP219 Test Method for Cloud Point of Petroleum Products3.Terminology3.1 Definitions:3.1.1 biodiesel,nfuel comprising mono-alkyl esters oflong-chain fatty acids derived from vegetable oils or
8、 animalfats,designated B100.3.1.1.1 DiscussionBiodiesel is typically produced by areaction of vegetable oil or animal fat with an alcohol such asmethanol or ethanol in the presence of a catalyst to yieldmono-esters and glycerin.The fuel typically may contain up to14 different types of fatty acids th
9、at are chemically transformedinto fatty acid methyl esters(FAME).3.1.2 biodiesel blend(BXX),nblend of biodiesel fuel withpetroleum-based diesel fuel designated BXX,where XX is thevolume percentage(as a whole number without the percentagesign)of biodiesel.3.1.3 cloud point,nin petroleum products and
10、biodieselfuels,the temperature of a liquid specimen when the smallestobservable cluster of wax crystals first occurs upon coolingunder prescribed conditions.3.1.3.1 DiscussionThe cloud point occurs when the tem-perature of the specimen is low enough to cause wax crystalsto precipitate.In a homogeneo
11、us liquid,the cloud is alwaysnoted first at the location in the specimen where the specimentemperature is the lowest.The cloud point is the temperature atwhich the crystals first occur,regardless of their location in thespecimen,and not after extensive crystallization has takenplace.The wax crystals
12、 that precipitate at lower temperaturesare typically,but not excluded to,straight-chain hydrocarbonsand lipids.3.2 Definitions of Terms Specific to This Standard:3.2.1 D2500/IP219 equivalent cloud point,ntemperatureof a specimen,in integers,calculated by applying a bias androunding the results of th
13、is test method to the next lowerinteger(see 12.2).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 1,2017.Published May 2017.Origin
14、allyapproved in 2011.Last previous edition approved in 2011 as D7689 11.DOI:10.1520 D7689-17.2For 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 Summa
15、ry page onthe ASTM website.3Available from Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.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 StatesT
16、his 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 3.2.1.1 DiscussionThis test method produces results with0.1 C resolution.Should the user wish to provide results witha similar format to Test Method D2500,then this calculationcan be pe
