Designation:D3240−15AnAmericanNationalStandardStandardTestMethodforUndissolvedWaterInAviationTurbineFuels1ThisstandardisissuedunderthefixeddesignationD3240;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthemeasurementofundissolvedwaterinaviationturbinefuelsinflowingfuelstreamswithoutexposingthefuelsampletotheatmosphereortoasamplecontainer.Theusualrangeoftestreadingscoversfrom1to60ppmoffreewater.Thistestmethoddoesnotdetectwaterdissolvedinthefuel,andthustestresultsforcomparablefuelstreamscanvarywithfueltemperatureandthedegreeofwatersolubilityinthefuel.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1DefinitionsofTermsSpecifictoThisStandard:2.1.1freewater,n—waternotdissolvedinthefuel.2.1.2FreeWaterIndependentofPadReader(FWIPR),n—acalculatedresultwhichprovidesfreewaterindependentoftestpadreaderusedformeasurement.FWIPRequationsweredevelopedfromthe2011ILSdata.23.SummaryofTestMethod3.1Ameasuredsampleoffuelispassedthroughasuraninedye-treatedfilterpad.Undissolved(free)waterinthefuelwillreactwiththeuraninedye.Whenthepadissubsequentlyilluminatedbyultraviolet(UV)light,thedyepreviouslycontactedbyfreewaterwillfluoresceabrightyellowwiththebrightnessincreasingforincreasingamountsoffreewaterinthefuel.Thelight-illuminatedpadiscomparedtoaknownstandardusingaphotocellcomparator,andthefreewaterinthefuelsampleisreadoutinpartspermillionbyvolume.Byvaryingthefuelsamplesize,therangeofthetestmethodcanbeincreased.4.SignificanceandUse4.1Undissolved(free)waterinaviationfuelcanen...
