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ControlValveAerodynamicNoisePredictionApproved19June1991ANSI/ISA–75.17–1989FormerlyANSI/ISA–S75.17–1989AMERICANNATIONALSTANDARDISATheInstrumentation,Systems,andAutomationSociety–TMCopyright�1989bytheInstrumentSocietyofAmerica.Allrightsreserved.PrintedintheUnitedStatesofAmerica.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherwise),withoutthepriorwrittenpermissionofthepublisher.ISA67AlexanderDriveP.O.Box12277ResearchTrianglePark,NorthCarolina27709ANSI/ISA-75.17-1989,ControlValveAerodynamicNoisePredictionISBN1-55617-207-9ANSI/ISA-S75.17-19893PrefaceThisprefaceisincludedforinformationalpurposesandisnotpartofANSI/ISA-75.17-1989.ThisstandardhasbeenpreparedaspartoftheserviceofISAtowardagoalofuniformityinthefieldofinstrumentation.Tobeofrealvalue,thisdocumentshouldnotbestatic,butshouldbesubjecttoperiodicreview.Towardthisend,theSocietywelcomesallcommentsandcriticisms,andasksthattheybeaddressedtotheSecretary,StandardsandPracticesBoard,ISA,67AlexanderDrive,P.O.Box12277,ResearchTrianglePark,NC27709,Telephone(919)549-8411,e-mail:standards@isa.org.TheISAStandardsandPracticesDepartmentisawareofthegrowingneedforattentiontothemetricsystemofunitsingeneral,andtheInternationalSystemofUnits(SI)inparticular,inthepreparationofinstrumentationstandards.TheDepartmentisfurtherawareofthebenefitstoUSAusersofISAstandardsofincorporatingsuitablereferencestotheSI(andthemetricsystem)intheirbusinessandprofessionaldealingswithothercountries.Towardthisend,thisDepartmentwillendeavortointroduceSI-acceptablemetricunitsinallnewandrevisedstandardstothegreatestextentpossible.TheMetricPracticeGuide,whichhasbeenpublishedbytheInstituteofElectricalandElectronicsEngineersasANSI/IEEEStd.268-1982,andfuturerevisions,willbethereferenceguidefordefinitions,symbols,abbreviations,andconversionfactors.CertainmetricunitsthatarenotapartoftheSIsystemareincommonaccepteduse.Thisstandardusesbarasapressuremeasurementtha...