1、Designation:D324022An American National StandardStandard Test Method forUndissolved Water In Aviation Turbine Fuels1This standard is issued under the fixed designation D3240;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 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 the measurem
3、ent of undissolvedwater in aviation turbine fuels in flowing fuel streams withoutexposing the fuel sample to the atmosphere or to a samplecontainer.The usual range of test readings covers from 1 ppmto 60 ppm of free water.This test method does not detect waterdissolved in the fuel,and thus test resu
4、lts for comparable fuelstreams can vary with fuel temperature and the degree of watersolubility in the fuel.1.2 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,hea
5、lth,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Internat
6、ional Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 free water,nwater not dissolved in the fuel.2.1.2 Free Water Independent of Pad Reader(FWIPR),nacalculated
7、 result which provides free water independent of testpad reader used for measurement.FWIPR equations weredeveloped from the 2011 ILS data.23.Summary of Test Method3.1 A measured sample of fuel is passed through as uraninedye-treated filter pad.Undissolved(free)water in the fuel willreact with the ur
8、anine dye.When the pad is subsequentlyilluminated by ultraviolet(UV)light,the dye previouslycontacted by free water will fluoresce a bright yellow with thebrightness increasing for increasing amounts of free water inthe fuel.The light-illuminated pad is compared to a knownstandard using a photocell
9、comparator,and the free water in thefuel sample is read out in parts per million by volume.Byvarying the fuel sample size,the range of the test method canbe increased.4.Significance and Use4.1 Undissolved(free)water in aviation fuel can encouragethe growth of microorganisms and subsequent corrosion
10、in thetanks of aircraft and can also lead to icing of filters in the fuelsystem.Control of free water is exercised in ground fuelingequipment by use of filter-coalescers and water separators.5.Apparatus5.1 Test Pad Rater(UV Source Device)A device3,4,5,6forcomparing the fluorescence of the test pad t
11、o a known standard,while both are illuminated by the same source of UV light,shall be used.The amount of UV light striking the standardshall be modulated until the total fluorescence of the test padand the standard are equal;this shall be determined using aphotocell bridge circuit null indicator.The
12、 light modulating1This 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 April 1,2022.Published May 2022.Originallyapproved in 1973.Last p
13、revious edition approved in 2015 as D3240 15.DOI:10.1520/D3240-22.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1804.ContactASTM CustomerService at serviceastm.org.3The Aqua-Glo Series II instrument manufactured by Gammon
14、TechnicalProducts,Inc.,P.O.Box 400,Manasquan,NJ 08736-0400 was used in the originalprecision test program(RR:D02-1195).The unit is currently available in a Series Vconfiguration,which is changed only in the power supply.All water contentmeasuring components remain of the same configuration as the Se
15、ries II instrument.Manufacturers who wish to offer similar products are referred to Committee D02Equipment Replacement Guidelines.4The sole source of supply of the apparatus known to the committee at this timeis Gammon Technical Products Inc.,P.O.Box 400,Manasquan,NJ 08736-0400.5The Digital Aqua-Glo
16、(trademarked)instrument is manufactured by GammonTechnical Products,Inc.,P.O.Box 400,Manasquan,NJ 08736-0400.At instrumentstart-up,the display of software version 5.0 indicates that the electronic settings ofthe prototype units utilized in the 2011 ILS are in use.Because the electronicsettings were not optizimed at the time of the 2011 ILS,these units are onlypermitted to display calculated FWIPR results.Gammon Technical Products isworking toward ASTM approval of Digital Aqua-Glo instruments wit
