EPA Method 307

Method307-DeterminationofEmissionsfromHalogenatedSolventVaporCleaningMachinesUsingaLiquidLevelProcedure1.APPLICABILITYANDPRINCIPLE1.1Applicability.Thismethodisapplicabletothedeterminationofhalogenatedsolventemissionsfromsolventvaporcleanersintheidlingmode.1.2Principle.Thesolventlevelinthesolventcleaningmachineismeasuredusinginclinedliquidlevelindicators.Thechangeinliquidlevelcorrespondsdirectlytotheamountofsolventlostfromthesolventcleaningmachine.2.APPARATUSNote:MentionoftradenamesorspecificproductsdoesnotconstituteendorsementbytheEnvironmentalProtectionAgency.2.1InclinedLiquidLevelIndicator.AschematicoftheinclinedliquidlevelindicatorsusedinthismethodisshowninFigure307-1;twoinclinedliquidlevelindicatorshaving0.05centimetersdivisionsorsmallershallbeused.Theliquidlevelindicatorsshallbemadeofglass,Teflon,oranysimilarmaterialthatwillnotreactwiththesolventshallbeused.A6-in.x1-in.slopeisrecommended;howevertheslopemayvarydependingonthesizeanddesignofthecleaner.Note:Itisimportantthattheinclinedliquidlevelindicatorsbeconstructedwitheaseofreadinginmind.Theinclinedliquidlevelindicatorsshouldalsobemountedsuchthattheycanberaisedorloweredifnecessarytosuitcleanersize.2.2HorizontalIndicator.Devicetochecktheinclinedliquidlevelindicatorsorientationrelativetohorizontal.2.3VelocityMeter.Hotwireandvaneanemometers,orotherdevicescapableofmeasuringtheflowratesrangingfrom0to15.2m/minacrossthesolventcleaningmachine.3.PROCEDURE3.1ConnectionoftheInclinedLiquidLevelIndicator.ConnectoneoftheinclinedliquidlevelindicatorstotheboilingsumpdrainandtheotherinclinedliquidlevelindicatortotheimmersionsumpdrainusingTeflontubingandtheappropriatefittings.AschematicdiagramisshowninFigure307-2.3.2PositioningtheVelocityMeter.Positionthevelocitymetersothatitmeasurestheflowrateoftheairpassingdirectlyacrossthesolventcleaningmachine.3.3Leveltheinclinedliquidlevelindicators.3.4InitialInclinedLiquidLevelIndicatorReadings.Openthesumpdrainagevalves.Allowthesolventcleaningmachinetooperatelongenoughforthevaporzonetoformandthesystemtostabilize(checkwithmanufacturer).Recordtheinclinedliquidlevelindicatorsreadingsandthestartingtimeonthedatasheet.AdatasheetisprovidedinFigure307-3.3.5FinalInclinedLiquidLevelIndicatorReadings.Attheendofthe16hourtestrun,checktomakesuretheinclinedliquidlevelindicatorsarelevel;ifnot,makethenecessaryadjustments.Recordthefinalinclinedliquidlevelindicatorsreadingsandtime.3.6DetermineofSolventVapor/AirInterfaceAreaforEachSump.Determinetheareaofthesolvent/airinterfaceoftheindividualsumps.Wheneverpossible,physicallymeasurethesedimensionsratherthanusingfactoryspecifications.AschematicofthedimensionsofasolventcleaningmachineisprovidedinFigure307-4.4.CALCULATIONS4.1Nomenclature.AB=Areaofboilingsumpinterface,m2(ft2).AI=Areaofimmersionsumpinterface,m2(ft2).Av=Areaofsolvent/airinterface,m2(ft2).E=Emissionrate,kg/m3-hr(lb/ft3-hr).K=100,000cmg/mkgformetricunits.=12in./ftforEnglishunits.Lbf=BoilingsumpInclinedliquidlevelindicatorsreading,cm(in.).LBi=InitialboilingsumpInclinedliquidlevelindicatorsreading,cm(in.).LIf=FinalimmersionsumpInclinedliquidlevelindicatorsreading,cm(in.).LIi=InitialimmersionsumpInclinedliquidlevelindicatorsreading,cm(in.).SB=Lengthoftheboilingsump,m(ft).SI=Lengthoftheimmersionsump,m(ft).SV=Lengthofthesolventvapor/airinterface,m(ft).WB=Widthoftheboilingsump,m(ft).WI=Widthoftheimmersionsump,m(ft).WV=Widthofthesolventvapor/airinterface,m(ft).ρ=Densityofsolvent,g/m3(lb/ft3).θ=Testtime,hr.4.2AreaofSumpInterfaces.Calculatetheareasoftheboilingandimmersionsumpinterfacesasfollows:4.3AreaofSolventVapor/AirInterface.Calculatetheareaofthesolventvapor/airinterfaceasfollows:4.4EmissionRate.Calculatetheemissionrateasfollow:AB=SBWBEx.307-1AI=SIWIEq.307-2AV=SVWVEq.307-3E=(LBf-LBi)ρAB+(LIf-LIi)ρAIKAvθEq.307-4DateRunSolventtypeSolventdensityg/m3(lb/ft3)Lengthofboilingsump(SB),m(ft)Widthofboilingsump(WB),m(ft)Lengthofimmersionsump(SI),m(ft)Widthofimmersionsump(WI),m(ft)Lengthofvapor-airinterface(SV),m(ft)Widthofvapor-airinterface(WV),m(ft)BoilingImmersionFlowClockSumpSumpRateTimeReadingReadingReadingFigure307-3.Datasheet.