1、Designation:D206820Standard Test Method forDetermining Filter Blocking Tendency1This standard is issued under the fixed designation D2068;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parenthes
2、es indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThis test method describes three procedures using different filter media.The result of any test isdependent on the filter mandated in the procedure.If a spec
3、ification requires a specific D2068procedure,do not substitute a different procedure or filter without agreement from the specifier.1.Scope*1.1 This test method covers three procedures for the deter-mination of the filter blocking tendency(FBT)and filterabilityof middle distillate fuel oils and liqu
4、id fuels such as biodieseland biodiesel blends.The three procedures and associated filtertypes are applicable to fuels within the viscosity range of1.3 mm2to 6.0 mm2/s at 40 C.NOTE1ASTM specification fuels falling within the scope of this testmethod are:Specification D396 Grades No 1 and 2;Specifica
5、tion D975Grades 1-D,low sulfur 1-D and 2-D;Specification D2880 Grades 1-GTand 2-GT;Specification D6751.1.2 This test method is not applicable to fuels that containfree(undissolved)water(see 7.3).1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are include
6、d 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,health,and environmental practices and deter-mine the applicability of regulatory limitations
7、 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 World Trade Organization Technic
8、alBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D396 Specification for Fuel OilsD975 Specification for Diesel FuelD2880 Specification for Gas Turbine Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4176 Test Method for Free Water and Particu
9、late Contami-nation in Distillate Fuels(Visual Inspection Procedures)D4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4860 Test Method for Free Water and Particulate Contami-nation in Middle Distillate Fuels(Clear and Bright Nu-merical Rating)D6300 Practice for Determination
10、of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and LubricantsD6426 Test Method for Determining Filterability of MiddleDistillate Fuel OilsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Meas
11、ure the Same Property of a MaterialD6751 Specification for Biodiesel Fuel Blend Stock(B100)for Middle Distillate Fuels2.2 ISO Standard:3ISO 5636-5 Paper and BoardDetermination of Air Per-meance and Air Resistance(Medium Range)Part 5Gurley Method1This test method is under the jurisdiction of ASTM Com
12、mittee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability,Cleanliness and Compatibility of Liquid Fuels.Current edition approved Oct.1,2020.Published October 2020.Originallyapproved in 1997.Last previous edition approved in 2017 a
13、s D2068 17.DOI:10.1520/D2068-20.2For 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 onthe ASTM website.3Available from American National
14、Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.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 StatesThis international standard was develope
15、d 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.2.3 ASTM Adjuncts:D2PP,Det
16、ermination of Precision and Bias Data for Use inTest Methods for Petroleum Products4CompTM,Standard Practice for Statistical Assessment andImprovement of the Expected Agreement between TwoTest Methods that Purport to Measure the Same Propertyof a Material43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 filterability,nof certain fuels,the relationship be-tween the volume of sample filtered and the measured pressureincrease across the filter.3.1.1.1 DiscussionThe filterabilit
