1、Designation:D768317Standard Test Method forCloud Point of Petroleum Products and Liquid Fuels(SmallTest Jar Method)1This standard is issued under the fixed designation D7683;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.1.Scope*1.1 This test method covers the determination of the cloudpoint of petroleum products,biodiesel,and biodiesel blendsthat are
3、transparent in layers 40 mm in thickness,using anautomatic instrument.1.2 The measuring range of the apparatus is from 65 C to+51 C,however the precision statements were derived onlyfrom samples with cloud point temperatures from 50 C to+6 C.1.3 The values stated in SI units are to be regarded assta
4、ndard.No other units of measurement are included in thisstandard.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-priate safety and health practices and determine the applica
5、-bility 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 Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the
6、 World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards: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
7、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 Standards:3IP219 Test Method for Cloud Point of Petroleum Products3.Terminology3.1 Definitions:3.1.1
8、 biodiesel,nfuel comprising mono-alkyl esters oflong-chain fatty acids derived from vegetable oils or 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 y
9、ieldmono-esters and glycerin.The fuel typically may contain up to14 different types of fatty acids that 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
10、 a whole number without the percentagesign)of biodiesel.3.1.3 cloud point,nin petroleum products and 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 w
11、hen the tem-perature of the specimen is low enough to cause wax crystalsto precipitate.In a homogeneous 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
12、their location in thespecimen,and not after extensive crystallization has takenplace.The wax crystals 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 small test jar method,nin cloud
13、 point test methods,automatic test procedure using a small sample size,prescribed1This 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
14、,2017.Published May 2017.Originallyapproved in 2011.Last previous edition approved in 2011 as D7683 11.DOI:10.1520/D7683-17.2For 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
15、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 Conshoh
16、ocken,PA 19428-2959.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 cooling rate,specimen receptacle,and optical system fordetection of crystal formation.3.2.1.1 DiscussionThe prescribed cooling rate is de-scribed in 11
