1、Designation:D270922Standard Test Method forWater and Sediment in Middle Distillate Fuels by Centrifuge1This standard is issued under the fixed designation D2709;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.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 the determination of the
3、volumeof free water and sediment(as a percentage of the sample)thatis suspended in the bulk fuel in middle distillate fuels withviscosities in the range of 1.0 mm2/s to 4.1 mm2/s at 40 C(1.0 cSt to 4.1 cSt at 104 F)and densities in the range of770 kgm3to 900 kg m3at 15 C.NOTE1Fuels corresponding to
4、Specification D396 Grades No.1 and2,D975 Grades No.1-D and 2-D,Specification D2880 Grades No.0-GT,1-GT and 2-GT,and Specification D3699 Grades No.1-K and 2-K andsimilar middle distillate fuels and blendstocks will usually fall in thisviscosity and density range.Test Method D1796 is intended for high
5、erviscosity fuel oils.1.2 The values stated in SI units are to be regarded asstandard.1.2.1 ExceptionThe non-SI values are for informationonly.1.3 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 t
6、o establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princi
7、ples 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:2D396 Specification for Fuel OilsD975 Specification for Diesel FuelD1796 Test Method for Water and S
8、ediment in Fuel Oils bythe Centrifuge Method(Laboratory Procedure)D2880 Specification for Gas Turbine Fuel OilsD3699 Specification for KerosineD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practic
9、e for Automatic Sampling of Petroleum andPetroleum Products3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D4175.3.2 Definitions:3.2.1 free water,nwater in excess of that soluble in theliquid sample(fuel)at the temperature of the test and usuallyappearing in th
10、e liquid sample(fuel)as a haze(cloudiness),droplets,or water layer.3.2.1.1 DiscussionNote that when there is a water layer ina biodiesel fuel blend,there can be water-soluble componentspresent in the free water.3.3 Abbreviations:3.3.1 rcfrelative centrifugal force.4.Summary of Test Method4.1 A 100 m
11、L sample of the undiluted fuel is centrifuged ata relative centrifugal force(see 6.2)of 800 for 10 min at 21 Cto 32 C(70 F to 90 F)in a specified centrifuge tube.Aftercentrifugation,the volume of free water and sediment that hassettled into the tip of the centrifuge tube is read to the nearest0.005
12、mL and reported as the volumetric percent water andsediment by centrifuge.5.Significance and Use5.1 This test method is used as an indication of free waterand sediment suspended as haze,cloudiness,or droplets inmiddle distillate fuels such as Grades No.1 and 2 fuel oil(Specification D396),Grades No.
13、1-D and 2-D diesel fuel(Specification D975),and Grades No.0-GT,1-GT,and 2-GTgas turbine fuels(Specification D2880),similar fuels andblendstocks used to make these fuels.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direc
14、t responsibility ofSubcommittee D02.14 on Stability,Cleanliness and Compatibility of Liquid Fuels.Current edition approved July 1,2022.Published August 2022.Originallyapproved in 1968.Last previous edition approved in 2016 as D2709 16.DOI:10.1520/D2709-22.2For referenced ASTM standards,visit the AST
15、M 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
16、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.15.2 Appreciable amounts of free water and sediment in afuel oil tend to cause fouling of fuel-handling facilities and togi
