ASME-MFC-26--2011

ANAMERICANNATIONALSTANDARDASMEMFC-26–2011MeasurementofGasFlowbyBellmouthInletFlowmetersASMEMFC-26–2011MeasurementofGasFlowbyBellmouthInletFlowmetersANAMERICANNATIONALSTANDARDThreeParkAvenue•NewYork,NY•10016USADateofIssuance:August10,2011ThisStandardwillberevisedwhentheSocietyapprovestheissuanceofanewedition.Therewillbenoaddendaissuedtothisedition.ASMEissueswrittenrepliestoinquiriesconcerninginterpretationsoftechnicalaspectsofthisStandard.PeriodicallycertainactionsoftheASMEMFCCommitteemaybepublishedasCases.CasesandinterpretationsarepublishedontheASMEWebsiteundertheCommitteePagesat(s)orperson(s)affiliatedwithindustryisnottobeinterpretedasgovernmentorindustryendorsementofthiscodeorstandard.ASMEacceptsresponsibilityforonlythoseinterpretationsofthisdocumentissuedinaccordancewiththeestablishedASMEproceduresandpolicies,whichprecludestheissuanceofinterpretationsbyindividuals.Nopartofthisdocumentmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.TheAmericanSocietyofMechanicalEngineersThreeParkAvenue,NewYork,NY10016-5990Copyright©2011byTHEAMERICANSOCIETYOFMECHANICALENGINEERSAllrightsreservedPrintedinU.S.A.iiiCONTENTSForeword..............................................................................................................................................................................ivCommitteeRoster................................................................................................................................................................vCorrespondenceWiththeMFCCommittee....................................................................................................................vi1General...............................................................................................................................................................12References.........................................................................................................................................................13DefinitionsandSymbols..................................................................................................................................24PrincipleofMeasurementandMethodofComputation...............................................................................35FlowConditioning.............................................................................................................................................116GeneralRequirements......................................................................................................................................127DischargeCoefficientDevelopment................................................................................................................148UncertaintiesintheMeasurementofFlowRate............................................................................................16Figures4.1-1BellmouthInletFlowNozzle—GeneralDescription(SideView)........................................................64.1-2BellmouthInletFlowNozzle—GeneralDescription(FrontView)......................................................64.3-1CleanInletMethod........................................................................................................................................84.3-2ComboProbe:PtandPsMethod.................................................................................................................94.3-3ComboProbe:PtandTtMethod.................................................................................................................105.2-1TypicalBoundaryLayerGrowth,FlatPlateModel..................................................................................127.3-1InletInstrumentation(TechniqueFromPara.4.3.1).................................................................................15Table3.3-1Symbols...........................................