ASTM_D_7261_-_14.pdf

Designation:D726114Standard 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 asD975 Grade No.1 and Grade No.2 of all sulfur levels,andMIL-F-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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel Fuel OilsD1193 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 ProductsD4176 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)D6426 Test Method for Determining Filterability of MiddleDistillate Fuel OilsD7224 Test Method for Determining Water Separation Char-acteristics of Kerosine-Type Aviation Turbine Fuels Con-taining Additives by Portable Separometer2.2 Military Standard:MIL-F-16884 Fuel,Naval Distillate(NATO F-76)33.Terminology3.1 For definitions of terms used in this test method that arenot shown below,refer to Test Methods D3948 and D7224.3.2 Definitions:3.2.1 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.3.2.1.1 DiscussionThe known surface active agent is typi-cally bis-2-ethylhexyl sodium sulfosuccinate,commonly re-ferred to as AOT,dissolved in toluene.3.2.2 surfactant,nin petroleum fuels,surface active ma-terial(or surface active agent)that could disarm(deactivate)filter separator(coalescing)elements so that free water is notremoved from the fuel in actual service.3.2.2.1 DiscussionTechnically,surfactants affect the inter-facial tension between water and fuel which affects thetendency of water to coalesce into droplets.3.2.3 strong surfactant,nin petroleum fuels,surface activematerial that disarms filter separator elements,allowing waterto pass.3.2.3.1 DiscussionStrong surfactants can be refinery pro-cess chemicals left in the fuel or contaminants introducedduring transportation of the fuel.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 Dec.1,2014.Published January 2015.Originallyapproved in 2006.Last previous edition approved in 2013 as D7261 13.DOI:10.1520/D7261-14.2For 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 Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.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 States1 3.2.4 weak surfactant,nin petroleum fuels,surface activematerial,typically certain types of additives such as staticdissipator additive,that does not adversely affect the perfor-mance of filter separator elements in actual service.3.3 Definitions of Terms Specific to This Standard:3.3.1 DSEP rating,nthe diesel separability rating ofdiesel fuel as measured by this test method.3.3.1.1 DiscussionDSEP ratings are only valid within therange of 50 to 100,with rating