Designation:D7520−13StandardTestMethodforDeterminingtheOpacityofaPlumeintheOutdoorAmbientAtmosphere1ThisstandardisissuedunderthefixeddesignationD7520;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribestheprocedurestodeterminetheopacityofaplume,usingdigitalimageryandassociatedhardwareandsoftware.Theaforementionedplumeiscausedbyparticulatematteremittedfromastationarypointsourceintheoutdoorambientenvironment.1.2Theopacityofemissionsisdeterminedbytheapplica-tionofaDigitalCameraOpacityTechnique(DCOT)thatconsistsofaDigitalStillCamera,AnalysisSoftware,andtheOutputFunction’scontenttoobtainandinterpretdigitalimagestodetermineandreportplumeopacity.1.3Thismethodissuitabletodeterminetheopacityofplumesfromzero(0)percenttoonehundred(100)percent.1.4Thistestmethodisnotapplicabletostackswithinternaldiametersgreaterthan7.0ft(2.13m).21.5Conditionsthatshallbeconsideredwhenusingthismethodtoobtainthedigitalimageoftheplumeincludetheplume’sbackground,theexistenceofcondensedwaterintheplume,orientationoftheDigitalStillCameratotheplumeandthesun(seeSection8).1.6ThisstandarddescribestheprocedurestocertifytheDCOT,hardware,software,andmethodtodeterminetheopacityoftheplumes.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2U.S.EnvironmentalProtectionAgency(USEPA)Docu-ment:4USEPAMethod9VisualDeterminationoftheOpacityofEmissionsfromStationarySources,40CFR,Part60,AppendixA-42.3InstituteofElec...
