ASTM_D_7261_-_22.pdf

Designation:D726122Standard Test Method forDetermining Water Separation Characteristics of DieselFuels by Portable Separometer1This standard is issued under the fixed designation D7261;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 rapid portable means for fieldand laboratory use to rate the ability of diesel fuels(both neatand those containing additives)to release entrained or emulsi-fied water when passed through fiberglass coalescing material.1.2 This test method is applicable to diesel fuels such asSpecification D975 Grade No.1-D and Grade No.2-D of allsulfur levels,Specification D7467 biodiesel blends B6-B20,and MIL-DTL-16884,naval distillate fuel(NATO F-76).NOTE1This test method is similar to Test Method D3948 which isapplicable to aviation turbine fuels.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,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:2D975 Specification for Diesel FuelD1193 Specification for Reagent WaterD3948 Test Method for Determining Water Separation Char-acteristics ofAviation Turbine Fuels by Portable Separom-eterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4176 Test Method for Free Water and Particulate Contami-nation in Distillate Fuels(Visual Inspection Procedures)D4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationD4860 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,Liquid Fuels,and LubricantsD6426 Test Method for Determining Filterability of MiddleDistillate Fuel OilsD7467 Specification for Diesel Fuel Oil,Biodiesel Blend(B6 to B20)2.2 Military Standard:MIL-DTL-16884 Fuel,Naval Distillate33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4175.3.1.2 reference fluid,nin MSEP4and DSEP4,dieselseparability water separability tests a reference fluid base towhich a prescribed quantity of a known surface active agenthas been added.3.1.2.1 DiscussionThe known surface active agent is typi-cally bis-2-ethylhexyl sodium sulfosuccinate,commonly re-ferred to as AOT,dissolved in toluene.3.1.3 strong surfactant,nin petroleum fuels,surface activematerial that disarms filter separator elements,allowing waterto pass.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,Cleanliness and Compatibility of Liquid Fuels.Current edition approved July 1,2022.Published August 2022.Originallyapproved in 2006.Last previous edition approved in 2017 as D7261 17.DOI:10.1520/D7261-22.2For 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 for electronic download at ASSIST Quick Search(http:/quicksearch.dla.mil).4MSEP and DSEP are registered trademarks of EMCEE Electronics,Inc,520Cypress Ave.,Venice,FL 34285.*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 International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.3.1 DiscussionStrong surfactants can be refinery pro-cess chemicals left in the fuel or contaminants introducedduring transportation of the fuel.3.1.4 surfactant,nin petroleum fuels,surface active ma-terial(or surface active