1、Designation:D462521Standard 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
2、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 thein
3、herent 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,Gra
4、des 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 abou
5、tstorage 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.1.4.1 ExceptionThe values in parentheses are for informa-tion only.1.5 This standard does not purport to address all o
6、f 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.1.6 This international standard was developed in accor-
7、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 Stan
8、dards:2D86 Test Method for Distillation of Petroleum Products andLiquid Fuels at Atmospheric 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 FuelD1193
9、 Specification for Reagent WaterD2880 Specification for Gas Turbine Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products3.Termi
10、nology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 adherent insolubles,ngums formed during storagethat remain tightly attached to the walls of the vessel after fuelhas been flushed from the
11、container.3.2.2 filterable insolubles,nsolids formed during storagethat can be removed from the fuel by filtration.3.2.3 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
12、 water,or reactive metals and dirt.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,Cleanliness and Compatibility of Liquid Fuels.Current edition approved Oct.1,2021.P
13、ublished November 2021.Originallyapproved in 1986.Last previous edition approved in 2016 as D4625 161.DOI:10.1520/D4625-21.2For 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 t
14、o 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 StatesThis international standard was developed in accordance with internati
15、onally 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.13.2.4 total insolubles,nthe arithmetic sum of the filte
16、rableinsolubles plus the adherent insolubles.4.Summary of Test Method4.1 Four-hundred(400)mLvolumes of filtered fuel are agedby storage in borosilicate glass containers at 43 C(110 F)forperiods of 4,8,12,18,and 24 weeks.If desired,performzero-week analyses on the same day as the other samples areplaced in storage.Zero-week data are used to provide base dataand ensure satisfactory technique.After aging for a selectedtime period,a sample is removed from storage,cooled to roomtemperature,and analyz
