ANSI ASME PTC 19.5-2004 Flow Measurement.pdf
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1、AN AMERICAN NATIONAL STANDARDFlow MeasurementASME PTC 19.5-2004Performance Test CodesIntentionally left blank ASME PTC 19.5-2004FlowMeasurementPerformance Test CodesAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Date of Issuance: July 25, 2005The 2004 edition of ASME PTC 19.5 is be
2、ing issued with an automatic addenda subscription service.The use of addenda allows revisions made in response to public review comments or committeeactions to be published as necessary. This Supplement will be revised when the Society approvesthe issuance of a new edition.ASME issues written replie
3、s to inquiries as code cases and interpretations of technical aspects ofthis document. Code cases and interpretations are published on the ASME Web site under theCommittee Pages at http:/www.asme.org/codes/ as they are issued.ASME is the registered trademark of The American Society of Mechanical Eng
4、ineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participa
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6、oes not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability
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9、ent may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2005 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reserve
10、dPrinted in U.S.A.CONTENTSNotice. ixForeword xCommitteeRoster . xiCorrespondenceWiththePTC19.5Committee . xiiiSection 1 Object and Scope . 11-1 Object 11-2 Scope 1Section 2 Definitions, Values, and Descriptions of Terms 22-1 PrimaryDefinitionsandSystemsofUnits . 22-2 HistoricalDefinitionsofUnitsofMe
11、asurement 22-3 SymbolsandDimensions . 32-4 ThermalExpansion . 42-5 SourcesofFluidandMaterialData 4Section 3 Differential Pressure Class Meters 193-0 Nomenclature 193-1 GeneralEquationforMassFlowRateThroughaDifferentialPressureClassMeter . 193-2 BasicPhysicalConceptsUsedintheDerivationoftheGeneralEqu
12、ationforMassFlow 203-3 TheoreticalFlowRateLiquidAstheFlowingFluid . 203-4 TheoreticalFlowRateGasorVaporAstheFlowingFluid . 213-5 ErrorsIntroducedinTheoreticalMassFlowRatebyIdealizedFlowAssumptions . 213-6 DischargeCoefficientCintheIncompressibleFluidEquation 213-7 DischargeCoefficientCandtheExpansio
13、nFactor H9280 forGases 213-8 CalculationofExpansionFactor H9280 . 223-9 DeterminingCoefficientofDischargeforDifferentialPressureClassMeters . 223-10 ThermalExpansion/ContractionofPipeandPrimaryElement . 233-11 SelectionandRecommendedUseofDifferentialPressureClassMeters . 233-12 RestrictionsofUse 243
14、-13 ProcedureforSizingaDifferentialPressureClassMeter . 243-14 FlowCalculationProcedure . 243-15 SampleCalculation . 253-16 SourcesofFluidandMaterialData 27Section 4 Orifice Meters . 284-0 Nomenclature 284-1 Introduction 284-2 TypesofThin-Plate,Square-EdgedOrifices 284-3 CodeComplianceRequirements .
15、 284-4 MultipleSetsofDifferentialPressureTaps . 284-5 MachiningTolerances,Dimensions,andMarkingsforOrificePlate . 284-6 MachiningTolerancesandDimensionsforDifferentialPressureTaps . 324-7 LocationofTemperatureandStaticPressureMeasurements 344-8 EmpiricalFormulationsforDischargeCoefficientC 344-9 Lim
16、itationsandUncertaintyofEqs.(4-8.1)Through(4-8.7)forDischargeCoefficientC . 35iii4-10 UncertaintyofExpansionFactor H9280 . 354-11 UnrecoverablePressureLoss 354-12 CalculationsofDifferentialPressureClassFlowMeasurementSteadyStateUncertainty 354-13 ProcedureforFittingaCalibrationCurveandExtrapolationT
17、echnique . 394-14 SourcesofFluidandMaterialData 42Section 5 Nozzles and Venturis 445-1 RecommendedProportionsofASMENozzles . 445-2 PressureTapRequirements 465-3 InstallationRequirements . 465-4 CoefficientofDischarge . 475-5 TheASMEVenturiTube 495-6 DesignandDesignVariations . 515-7 VenturiPressureT
18、aps . 515-8 DischargeCoefficientoftheASMEVenturi 525-9 InstallationRequirementsfortheASMEVenturi . 525-10 SourcesofFluidandMaterialData 53Section 6 Pulsating Flow Measurement . 546-1 Introduction 546-2 Orifices,Nozzles,andVenturis 546-3 TurbineMetersinPulsatingFlow . 586-4 SourcesofFluidandMaterialD
19、ata 61Section 7 Flow Conditioning and Meter Installation Requirements 647-1 Introduction 647-2 FlowConditionersandMeterInstallation . 657-3 PressureTransducerPiping . 697-4 InstallationofTemperatureSensors . 707-5 SourcesofFluidandMaterialData 70Section 8 Sonic Flow Nozzles and Venturis Critical Flo
20、w, Choked Flow Condition 728-1 Introduction 728-2 GeneralConsiderations . 758-3 Theory . 768-4 BasicTheoreticalRelationships 788-5 TheoreticalMassFlowCalculations . 788-6 DesignsofSonicNozzlesandVenturiNozzles . 868-7 CoefficientsofDischarge 878-8 Installation . 908-9 PressureandTemperatureMeasureme
21、nts 938-10 SourcesofFluidandMaterialData 94Section 9 Flow Measurement by Velocity Traverse . 979-0 Nomenclature 979-1 Introduction 979-2 TraverseMeasurementStations 979-3 RecommendedInstallationRequirements 999-4 CalibrationRequirementsforSensors 1019-5 FlowMeasurementProcedures 1059-6 FlowComputati
22、on 1079-7 ExampleofFlowComputationinaRectangularDuct 1099-8 SourcesofFluidandMaterialData 112Section 10 Ultrasonic Flow Meters 11310-1 Scope 11310-2 Applications 11310-3 FlowMeterDescription . 11410-4 Implementation. 116iv10-5 OperationalLimits 11710-6 ErrorSourcesandTheirReduction 11810-7 Exampleso
23、fLarge(1020ft)PipeFieldCalibrationsandAccuraciesAchieved . 12110-8 ApplicationGuidelines(SeeAlsoASMEPTC19.1,TestUncertainty) . 12110-9 InstallationConsiderations 12210-10 MeterFactorDeterminationandVerification. 12210-11 SourcesofFluidandMaterialData 123Section 11 Electromagnetic Flow Meters . 12411
24、-1 Introduction 12411-2 MeterConstruction . 12411-3 Calibration . 12711-4 ApplicationConsiderations . 12911-5 SourcesofFluidandMaterialData 130Section 12 Tracer Methods Constant Rate Injection Method UsingNonradioactive Tracers . 13112-0 Nomenclature 13112-1 Introduction 13112-2 ConstantRateInjectio
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