ASTM_D_4625_-_14.pdf

Designation:D462514Designation:378/87Standard Test Method forMiddle Distillate Fuel Storage Stability at 43 C(110 F)1This standard is issued under the fixed designation D4625;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 method for evaluating theinherent storage stability of distillate fuels having flash pointsabove 38 C(100 F),by Test Methods D93,and 90%distilledpoints below 340 C(644 F),by Test Method D86.NOTE1ASTM specification fuels falling within the scope of this testmethod are Specification D396,Grade Nos.1 and 2;Specification D975,Grades 1-D and 2-D;and Specification D2880,Grades 1-GT and 2-GT.1.2 This test method is not suitable for quality controltesting but,rather it is intended for research use to shortenstorage time relative to that required at ambient storagetemperatures.1.3 Appendix X1 presents additional information aboutstorage stability and the correlation of Test Method D4625results with sediment formation in actual field storage.1.4 The values given in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.5 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:2D86 Test Method for Distillation of Petroleum Products atAtmospheric PressureD93 Test Methods for Flash Point by Pensky-MartensClosed Cup TesterD381 Test Method for Gum Content in Fuels by Jet Evapo-rationD396 Specification for Fuel OilsD975 Specification for Diesel Fuel OilsD1193 Specification for Reagent WaterD2880 Specification for Gas Turbine Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 adherent insolubles,ngums formed during storagethat remain tightly attached to the walls of the vessel after fuelhas been flushed from the container.3.1.2 filterable insolubles,nsolids formed during storagethat can be removed from the fuel by filtration.3.1.3 inherent storage stability,nof middle distillatefuelthe resistance of the fuel to change during storage incontact with air,but in the absence of other environmentalfactors such as water,or reactive metals and dirt.3.1.4 total insolubles,nthe arithmetic sum of the filterableinsolubles plus the adherent insolubles.4.Summary of Test Method4.1 Four-hundred millilitre volumes of filtered fuel are agedby storage in borosilicate glass containers at 43 C(110 F)forperiods of(0,4,8,12,18,24)weeks.After aging for a selectedtime period,a sample is removed from storage,cooled to roomtemperature,and analyzed for filterable insolubles and foradherent insolubles.5.Significance and Use5.1 Fuel oxidation and other degradative reactions leadingto formation of sediment(and color)are mildly accelerated bythe test conditions compared with typical storage conditions.Test results have been shown to predict storage stability morereliably than other more accelerated tests.See Appendix X1 forinformation on the correlation of test results with actual fieldstorage.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 and Cleanliness of Liquid Fuels.Current edition approved Dec.1,2014.Published March 2015.Originallyapproved in 1986.Last previous edition approved in 2009 as D4625 04(2009).This test method was adopted as a joint ASTM/IP standard in 1986.DOI:10.1520/D4625-14.2For 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.*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 5.2 Because the storage periods are long(4 weeks to24 weeks),the test method is not suitable for quality controltesting,but does provide a tool for research on storageproperties of fuels.5.3 Because environmental effects and the materials andnature of tank construction affect storage stability,the resultsobtained by this test are not necessarily the same as thoseobtained during storage in a specific field storage situation.6.Apparatus6.1 Sample Containers,borosilicate glass bottles.The con