ASTM_D_6426_-_18.pdf

Designation:D642618Standard Test Method forDetermining Filterability of Middle Distillate Fuel Oils1This standard is issued under the fixed designation D6426;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.1.Scope*1.1 This test method covers a procedure for determining thefilterability of distillate fuel oils within the viscosity range from1.70 mm2/s to 6.20 mm2/s(cSt)at 40 C.NOTE1ASTM specification fuels falling within the scope of this testmethod are Specification D396 Grade No.2,Specification D975 GradeNo.2-D,and Specification D2880 Grade No.2-GT.NOTE2The test method has been used with lower viscosity middledistillate fuels such as Specification D396 Grade No.1,SpecificationD975 Grade No.1-D,and Specification D2880 Grade No.1-GT,but theprecision has not been studied and therefore the stated precision has notbeen validated for these grades.1.2 This test method is not applicable to fuels that containundissolved water.1.3 The values stated in SI units are to be regarded asstandard.1.3.1 Non-SI units,specifically U.S.customary units suchas temperature in degrees Fahrenheit and pressure in poundsper square inch gauge(psig),are included for information.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 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 TechnicalBarriers to Trade(TBT)Committee.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)3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 filterability,na measure of the rapidity with which astandard filter medium is plugged by insoluble matter in fueland may be described as a function of pressure or volume:3.1.2 filterability(by pressure),nthe pressure drop acrossa filter medium when 300 mL of fuel is passed at a rate of20 mL min.3.1.3 filterability(by volume),nthe volume of fuel passedwhen a pressure of 104 kPa(15 psig)is reached.3.1.3.1 DiscussionFilterability by volume is used whenless than 300 mL passes at a pressure up to 104 kPa(15 psig).3.1.4 filterability quality factor(F-QF),na value thatdefines the filter plugging tendency of a fuel caused byparticulates.3.1.4.1 DiscussionThe F-QF value is calculated using thevolume and pressure attained at the end of the test cycle,according to one of two equations,depending on the outcomeof the test.(See Section 10,Calculations.)4.Summary of Test Method4.1 A sample is passed at a constant rate(20 mL min)through a standard porosity filter medium.The pressure dropacross the filter and the volume of filtrate are monitored.Thetest is concluded either when the pressure drop across the filterexceeds 104 kPa(15 psig)or when 300 mL have passedthrough the filter.4.2 Results are reported as either the volume that has passedthrough the filter when a pressure of 104 kPa(15 psig)hasbeen reached or the pressure drop when 300 mL have passedthrough the filter.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.14 on Stability,Cleanliness and Compatibility of Liquid Fuels.Current edition approved Dec.1,2018.Published February 2019.Originallyapproved in 1999.Last previous edition approved in 2013 as D6426 13.DOI:10.1520/D6426-18.2For 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.*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 developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of Internatio