ASTM_D_6426_-_13.pdf

Designation:D642613Standard 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 to 6.20 mm2/s(cSt)at 40C.NOTE1ASTM specification fuels falling within the scope of this testmethod are Specification D396 Grade Nos.1 and 2,Specification D975Grades 1-D,low sulfur 1-D,2-D,and low sulfur 2-D,and SpecificationD2880 Grade Nos.1-GT and 2-GT.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 Units of pressure are also provided in inch-pound forinformation.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)2.2 ASTM Adjuncts:ADJ6300 D2PP,Version 4.43,Determination of Precisionand Bias Data for Use in Test Methods for PetroleumProducts33.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 of 20mL/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)has beenreached or the pressure drop when 300 mL have passedthrough the filter.4.3 Verification of the apparatus is required when there is adoubt of a test result,or when the apparatus has not been used1This 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 and Cleanliness of Liquid Fuels.Current edition approved July 1,2013.Published August 2013.Originallyapproved in 1999.Last previous edition approved in 2007 as D6426 07.DOI:10.1520/D6426-13.2For 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 ASTM International Headquarters.Order Adjunct No.ADJD6300.*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 for three months or more.It is not necessary to verify apparatusperformance prior to each test.5.Significance and Use5.1 This test method is intended for use in the laboratory orfield in evaluating distillate fuel cleanliness.5.2 A change in filtration performance after storage,pretreatment,or commingling can be indicative of changes infuel condition.5.3 Relative filterability of fuels may vary depending onfilter porosity and structure and may not always correlate withresults from this test method.5.4 Causes of poor filterability in industrial/refinery filters