1、Designation:D750112aStandard Test Method forDetermination of Fuel Filter Blocking Potential of Biodiesel(B100)Blend Stock by Cold Soak Filtration Test(CSFT)1This standard is issued under the fixed designation D7501;the number immediately following the designation indicates the year oforiginal adopti
2、on or,in the case of 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.1.Scope*1.1 This test method covers the determination by filtrationtime after cold soak of t
3、he suitability for a biodiesel(B100)blend stock that meets all other requirements of SpecificationD6751 and has a cloud point below 20C(68F)to provideadequate low temperature operability performance to at leastthe cloud point of the finished blend.1.2 The formal precision of this test method is incl
4、uded in13.1 on Precision.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 to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this stand
5、ard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD6217 Test Method for Particulate Contamination in MiddleDi
6、stillate Fuels by Laboratory FiltrationD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6751 Specification for Biodiesel Fuel Blend Stock(B100)for Middle Distillate Fuels3.Terminology3.1 Definitions:3.1.1 biodiesel,nfuel comprise
7、d of mono-alkyl esters oflong chain fatty acids derived from vegetable oils or animalfats,designated as B100.3.1.2 bond,vto connect two parts of a system electricallyby means of a conductive wire to eliminate voltage differences.3.1.3 BXX blend,nfuel blend consisting of up to 20volume percent biodie
8、sel designated as up to B20 conformingto the requirements of Specification D6751 with the remainderbeing a light middle or middle distillate grade diesel fuel andmeeting the requirements of this test method.3.1.3.1 DiscussionThe abbreviation BXX represents aspecific blend concentration in the range
9、B2 to B20,where XXis the percent volume of biodiesel in the fuel blend.3.1.4 ground,vto connect electrically with earth.3.2 Definitions of Terms Specific to This Standard:3.2.1 air chamber,nunit to control temperature of samplefor cooling with maximum 0.5C variation from set point.Theunit shall use
10、a microprocessor temperature controller withdigital set point and readout.Afood-grade refrigerator does notprovide adequate temperature stability for this test method.3.2.2 minor component,nmaterial present in B100,typi-cally at concentrations well below 1%by mass.3.2.3 thermal history,nrange of tem
11、peratures that a batchor sample of B100 has experienced which can result inseparation or precipitation of minor components.3.2.3.1 DiscussionCooling some biodiesel fuels can resultin precipitation or separation of minor components that havelimited solubility in B100.Heating these biodiesel fuels abo
12、ve40C is believed to redissolve most of these minor componentsand thus erase the thermal history of the sample.3.3 Abbreviations:3.3.1 CSFTCold Soak Filtration Test4.Summary of Test Method4.1 In this test method,300 mLof biodiesel(B100)is storedat 4.5 6 0.5C(40 6 1F)for 16 h,allowed to warm to 25 61
13、C(77 6 2F),and vacuum filtered through a single 0.7 mglass fiber filter at controlled vacuum levels of 7085 kPa(2125 in.of Hg).4.2 The filtration time is reported in seconds.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the
14、direct responsibility ofSubcommittee D02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved Nov.1,2012.Published February 2013.Originallyapproved in 2009.Last previous edition approved in 2012 as D750112.DOI:10.1520/D7501-12A.2For referenced ASTM standards,visit the ASTM websit
15、e,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO
16、 Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 Some substances that are soluble or appear to be solublein biodiesel(B100)at room temperature will,upon cooling totemperatures above the cloud point or standing at roomtemperature for extended periods,come out of solution.Thisphenomenon has been observed in both B100 and BXX blends.These substances can cause filter plugging.This methodprovides an accelerated means of assessing the presence ofthese substances in B1
