ASTM_D_2068_-_14.pdf

Designation:D206814Standard 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 parentheses 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 specification 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 liquid fuels such as biodieseland biodiesel blends.The 3 procedures and associated filtertypes,are applicable to fuels within the viscosity range of 1.3to 6.0 mm2/s at 40C.NOTE1ASTM specification fuels falling within the scope of this testmethod are:Specifications D396 Grades No 1 and 2;Specification 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 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 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D396 Specification for Fuel OilsD975 Specification for Diesel Fuel OilsD2880 Specification for Gas Turbine Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4176 Test Method for Free Water and Particulate 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 of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6426 Test Method for Determining Filterability of MiddleDistillate Fuel OilsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure 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 Method2.3 ASTM Adjuncts:D2PP,Determination 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:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1997.Last previous edition approved in 2013 as D2068 13.DOI:10.1520/D2068-14.2For 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 Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4This adjunct has been withdrawn and is no longer available.*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 States1 3.1.1 filter blocking tendency(FBT),nof certain fuels,acalculated dimensionless value that defines the tendency ofparticulates in a fuel to plug or block a filter.3.1.1.1 DiscussionThe value is calculated using the pres-sure across the filter or the volume of fuel filtered at the end ofthe test.Depending on the outcome of the test,one of twoequations is applied.See Section 10,Calculation.See 5.6 forinterpretation of results.3.1.2 filterability,nof certain fuels,the relationship be-tween the volume of sample filtered and the measured pressureincrease across the filter.3.1.2.1 DiscussionThe filterability of the fuel can beassessed by recording the pressure when a specific volume offuel has flowed through the filter,or recording the volumewhen a specific pressure across the filter has been