1、Designation:D577115Designation:IP 44409Standard Test Method forCloud Point of Petroleum Products(Optical DetectionStepped Cooling Method)1This standard is issued under the fixed designation D5771;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f 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 describes an alternative procedure for the determination of cloud point ofpetroleu
3、m products Test Method D2500/IP 219 using an automatic apparatus.The temperature resultsfrom this test method have been found to be equivalent to Test Method D2500/IP 219.Whenspecification requires Test Method D2500/IP 219,do not substitute this test method or any othermethod without obtaining compa
4、rative data and agreement from the specifier.1.Scope*1.1 This test method covers the description of the determi-nation of the cloud point of petroleum products and biodieselfuels that are transparent in layers 40 mm in thickness,by anautomatic instrument using an optical device.1.2 This test method
5、covers the range of temperaturesfrom 60 C to+49 C with temperature resolution of 0.1 C,however,the range of temperatures included in the 1997interlaboratory cooperative test program only covered thetemperature range of 56 C to+34 C.1.3 The values stated in SI units are to be regarded asstandard.No o
6、ther 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-bility of
7、 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2500 Test Method for Cloud Point of Petroleum ProductsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD6708 Practice for Statis
8、tical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material2.2 Energy Institute Standard:3IP 219 Test Method for Cloud Point of Petroleum Products32.3 Other Standard:4IEC 751 Industrial Platinum Resistance Thermometer Sen-sors
9、3.Terminology3.1 Definitions:3.1.1 biodiesel,nfuel comprised of mono-alkyl esters oflong chain fatty acids derived from vegetable oils or animalfats,designated B 100.3.1.1.1 DiscussionBiodiesel is typically produced by areaction of vegetable oil or animal fat with an alcohol such asmethanol or ethan
10、ol in the presence of a catalyst to yieldmono-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,na blend of biodiesel fuel withpetroleum-based diesel fuel designated BXX,w
11、here XX is thevolume%of biodiesel.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 April 1,2015.Published April 2015.Originallyapproved
12、 in 1995.Last previous edition approved in 2012 as D5771 12.DOI:10.1520/D5771-15.2For 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 onth
13、e ASTM website.3Available from Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.uk.4Available from International Electrotechnical Commission(IEC),3 rue deVaremb,Case postale 131,CH-1211,Geneva 20,Switzerland,http:/www.iec.ch.*A Summary of Changes section appears at
14、the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 cloud point,n in petroleum products and biodieselfuels,the temperature of a liquid specimen when the smallestobservable cluster of hydrocarbon crystals first oc
15、curs uponcooling under prescribed conditions.3.1.3.1 DiscussionThe cloud point occurs when the tem-perature of the specimen is low enough to cause hydrocarboncrystals to precipitate.In a homogeneous liquid,the cloud isalways noted first at the location in the specimen where thespecimen temperature i
16、s the lowest.The cloud point is thetemperature at which the crystals first occur,regardless of theirlocation in the specimen,and not after extensive crystallizationhas taken place.The hydrocarbon crystals that precipitate atlower temperatures are typically,but not excluded to,straightchain hydrocarbons commonly called“wax crystals.”3.1.3.2 DiscussionThe purpose of the cloud point methodis to detect the presence of the wax crystals in the specimen;however,trace amounts of water and inorganic comp
