ASTM_D_3948_-_14.pdf

Designation:D394814An American National StandardStandard Test Method forDetermining Water Separation Characteristics of AviationTurbine Fuels by Portable Separometer1This standard is issued under the fixed designation D3948;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers a rapid portable means for fieldand laboratory use to rate the ability of aviation turbine fuels torelease entrained or emulsified water when passed throughfiberglass coalescing material.1.2 The procedure section of this test method contains twodifferent modes of test equipment operation.The primarydifference between the modes of operation is the rate of fuelflow through the fiberglass coalescing material.Test methodselection is dependent on the particular fuel to be tested.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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:2D1655 Specification for Aviation Turbine FuelsD2550 Method of Test for Water Separation Characteristicsof Aviation Turbine Fuels(Withdrawn 1989)3D3602 Test Method for Water Separation Characteristics ofAviation Turbine Fuels(Withdrawn 1994)3D4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationD7224 Test Method for Determining Water Separation Char-acteristics of Kerosine-Type Aviation Turbine Fuels Con-taining Additives by Portable SeparometerD7261 Test Method for Determining Water Separation Char-acteristics of Diesel Fuels by Portable Separometer2.2 Military Standards:4MIL-T-5624 Turbine Fuel,Aviation Grades JP-4,JP-5,andJP-5/JP-8 STMIL-T-38219 Turbine Fuel,Low Volatility,JP-7MIL-T-83133 Turbine Fuel,Aviation,Kerosene Types,NATO F34(JP-8),NATO F-35,and JP-8+1003.Terminology3.1 For definitions of terms used in this test method that arenot shown below,refer to Test Methods D7224 and D7261.3.2 Definitions:3.2.1 Micro-Separometer5rating(MSEP5rating),nin theaviation fuel industry,a numerical value indicating the ease ofseparating emulsified water from aviation(jet)fuel by coales-cence as affected by the presence of surface active materials(also known as surface active agents or surfactants).3.2.1.1 DiscussionMSEP ratings obtained using Test Aand Test B are termed MSEP-A and MSEP-B,respectively.3.2.1.2 DiscussionMSEP ratings are only valid within therange of 50 to 100,with ratings at the upper end of the rangeindicating a clean fuel with little or no contamination bysurfactants,which is expected to show good water-separatingproperties when passed through a filter-separator(coalescing-type filter)in actual service.3.2.2 reference fluid,nin MSEP and DSEP5diesel sepa-rability water separability tests,a reference fluid base towhich a prescribed quantity of a known surface active agenthas been added.3.2.2.1 DiscussionThe known surface active agent is typi-cally bis-2-ethylhexyl sodium sulfosuccinate,commonly re-ferred to as AOT,dissolved in toluene.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.J0.05 on Fuel Cleanliness.Current edition approved Dec.1,2014.Published January 2015.Originallyapproved in 1980.Last previous edition approved in 2013 as D3948 13.DOI:10.1520/D3948-14.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.5MSEP,DSEP,and Micro-Separometer are trademarks of EMCEEElectronics,Inc.,520 Cypress 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 3.2.3 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.3.2.3.1 DiscussionTechnically,surfactants affect the inter-facial tension between water and fuel which affects thetendency of water