ASME PTC Flow Measurement

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1 ASME PTC Flow Measurement Performance Test Codes A N A M E R I C A N N A T I O N A L S T A N D A R D

2 ASME PTC Flow Measurement Performance Test Codes AN AMERICAN NATIONAL STANDARD Three Park Avenue New York, NY 10016

3 Date of Issuance: July 25, 2005 The 2004 edition of ASME PTC 19.5 is being issued with an automatic addenda subscription service. The use of addenda allows revisions made in response to public review comments or committee actions to be published as necessary. This Supplement will be revised when the Society approves the issuance of a new edition. ASME issues written replies to inquiries as code cases and interpretations of technical aspects of this document. Code cases and interpretations are published on the ASME Web site under the Committee Pages at as they are issued. ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not approve, rate, or endorse any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals. No part of this document 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 Engineers Three Park Avenue, New York, NY Copyright 2005 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.

4 CONTENTS Notice... ix Foreword... x Committee Roster... xi Correspondence With the PTC 19.5 Committee... xiii Section 1 Object and Scope Object Scope... 1 Section 2 Definitions, Values, and Descriptions of Terms Primary Definitions and Systems of Units Historical Definitions of Units of Measurement Symbols and Dimensions Thermal Expansion Sources of Fluid and Material Data... 4 Section 3 Differential Pressure Class Meters Nomenclature General Equation for Mass Flow Rate Through a Differential Pressure Class Meter Basic Physical Concepts Used in the Derivation of the General Equation for Mass Flow Theoretical Flow Rate Liquid As the Flowing Fluid Theoretical Flow Rate Gas or Vapor As the Flowing Fluid Errors Introduced in Theoretical Mass Flow Rate by Idealized Flow Assumptions Discharge Coefficient C in the Incompressible Fluid Equation Discharge Coefficient C and the Expansion Factor for Gases Calculation of Expansion Factor Determining Coefficient of Discharge for Differential Pressure Class Meters Thermal Expansion/Contraction of Pipe and Primary Element Selection and Recommended Use of Differential Pressure Class Meters Restrictions of Use Procedure for Sizing a Differential Pressure Class Meter Flow Calculation Procedure Sample Calculation Sources of Fluid and Material Data Section 4 Orifice Meters Nomenclature Introduction Types of Thin-Plate, Square-Edged Orifices Code Compliance Requirements Multiple Sets of Differential Pressure Taps Machining Tolerances, Dimensions, and Markings for Orifice Plate Machining Tolerances and Dimensions for Differential Pressure Taps Location of Temperature and Static Pressure Measurements Empirical Formulations for Discharge Coefficient C Limitations and Uncertainty of Eqs. (4-8.1) Through (4-8.7) for Discharge Coefficient C iii

5 4-10 Uncertainty of Expansion Factor Unrecoverable Pressure Loss Calculations of Differential Pressure Class Flow Measurement Steady State Uncertainty Procedure for Fitting a Calibration Curve and Extrapolation Technique Sources of Fluid and Material Data Section 5 Nozzles and Venturis Recommended Proportions of ASME Nozzles Pressure Tap Requirements Installation Requirements Coefficient of Discharge The ASME Venturi Tube Design and Design Variations Venturi Pressure Taps Discharge Coefficient of the ASME Venturi Installation Requirements for the ASME Venturi Sources of Fluid and Material Data Section 6 Pulsating Flow Measurement Introduction Orifices, Nozzles, and Venturis Turbine Meters in Pulsating Flow Sources of Fluid and Material Data Section 7 Flow Conditioning and Meter Installation Requirements Introduction Flow Conditioners and Meter Installation Pressure Transducer Piping Installation of Temperature Sensors Sources of Fluid and Material Data Section 8 Sonic Flow Nozzles and Venturis Critical Flow, Choked Flow Condition Introduction General Considerations Theory Basic Theoretical Relationships Theoretical Mass Flow Calculations Designs of Sonic Nozzles and Venturi Nozzles Coefficients of Discharge Installation Pressure and Temperature Measurements Sources of Fluid and Material Data Section 9 Flow Measurement by Velocity Traverse Nomenclature Introduction Traverse Measurement Stations Recommended Installation Requirements Calibration Requirements for Sensors Flow Measurement Procedures Flow Computation Example of Flow Computation in a Rectangular Duct Sources of Fluid and Material Data Section 10 Ultrasonic Flow Meters Scope Applications Flow Meter Description Implementation iv

6 10-5 Operational Limits Error Sources and Their Reduction Examples of Large (10 20 ft) Pipe Field Calibrations and Accuracies Achieved Application Guidelines (See Also ASME PTC 19.1, Test Uncertainty) Installation Considerations Meter Factor Determination and Verification Sources of Fluid and Material Data Section 11 Electromagnetic Flow Meters Introduction Meter Construction Calibration Application Considerations Sources of Fluid and Material Data Section 12 Tracer Methods Constant Rate Injection Method Using Nonradioactive Tracers Nomenclature Introduction Constant Rate Injection Method Tracer Selection Mixing Length Procedure Fluorimetric Method of Analysis Flow Test Setup Errors Sources of Fluid and Material Data Section 13 Radioactive Tracer Technique for Measuring Water Flow Rate Tracer Requirements Measurement Principles Locating Injection and Sample Taps Injection and Sampling Lines Sampling Flow Rate Timing and Sequence Sources of Fluid and Material Data Section 14 Mechanical Meters Turbine Meters Turbine Meter Signal Transducers and Indicators Calibration Recommendations for Use Piping Installation and Disturbances Positive Displacement Meters Sources of Fluid and Material Data Figures Location of Pressure Taps for Orifices With Flange Taps and With D and D/2 Taps Location of Pressure Taps for Orifices With Corner Taps Standard Orifice Plate Deflection of an Orifice Plate by Differential Pressure Orifice-Metering Run Calibration Points and Fitted Curves (Test Data Versus Fitted Curves) Primary Flow Section ASME Flow Nozzles Boring in Flow Section Upstream of Nozzle Nozzle With Diffusing Cone v

7 5-5 Profile of the ASME Venturi Measured Errors Versus Oscillating Differential Pressure Amplitude Relative to the Steady State Mean Fluid-Metering System Block Diagram Experimental and Theoretical Pulsation Error Semi-Log Plot of Theoretical Meter Pulsation Error Versus Rotor Response Parameter for Sine Wave Flow Fluctuation, D 2 p 0.1, and Pulsation Index, I p 0.1 and Experimental Meter Pulsation Error Versus Pulsation Index Recommended Designs of Flow Conditioner Methods of Making Pressure Connections to Pipes Ideal Mach Number Distribution Along Venturi Length at Typical Subcritical and Critical Flow Conditions Definition of Critical Flow As the Maximum of the Flow Equation, Eq. (8-1.1) Requirements for Maintaining Critical Flow in Venturi Nozzles Mass Flow Versus Back-Pressure Ratio for a Flow Nozzle Without a Diffuser and a Venturi Nozzle With a Diffuser Schematic Representation of Flow Defects at Venturi Throat Schematic Diagram of Sonic Surfaces at the Throat of an Axially Symmetric Critical Flow Venturi Nozzle Generalized Compressibility Chart Error in Critical Flow Function C* i for Air Using Method 2 Based on Ideal Gas Theory With Ratio of Specific Heats Corresponding to the Inlet Stagnation State Error in Method 3 for Air Based on Critical Flow Functions [15] When Using Air Property Data Calculation Processes for the Isentropic Path From Inlet to Sonic Throat for a Real Gas Using the Method of Johnson Standardized Toroidal Throat Sonic Flow Venturi Nozzle Standardized Cylindrical Throat Sonic Flow Venturi ASME Long-Radius Flow Nozzles Composite Results for Toroidal-Throat Venturi Nozzles Mean Line Discharge Coefficient Curves for Toroidal-Throat Venturi Nozzles Composite Graph of Discharge Coefficients for the ASME Low- Throat-Tap Flow Nozzles Standardized Inlet Flow Conditioner and Locations for Pressure and Temperature Measurements Comparison of the Continuous Curvature Inlet With the Sharp-Lip, Free- Standing Inlet Standardized Pressure Tap Geometry Pipe Velocity Measurement Loci Pitot Tubes Not Requiring Calibration (Calibration Coefficient p 1.000) Pitot Tubes Needing Calibration But Acceptable Cole Reversible Pitometer Structural Reinforcements Laser Doppler Velocimeter System Pitot Rake Impact Pressure Tube Rake Velocity Traverse Measurement Loci for a 3 3 Array Inlet Duct With Pitot-Static Rake Installed Wetted Transducer Configuration Protected Configuration With Cavities Protected Configuration With Protrusions Protected Configuration With Smooth Bore vi

8 10-4 Acoustic Flow Measuring System Block Design Acoustic Path Configurations A Typical Crossed-Path Ultrasonic Flow Meter Configuration Magnetic Flow Meter Weighting Function of the Magnetic Flow Meter AC and Pulsed DC Excitation Voltages Typical Flow Calibration Data Schematic Control Volume Plot of Equations for Central Injection Variation of Mixing Distance With Reynolds Number Experimental Results Typical Fluorometer Calibration Curves Dye Injection Schematic Sampling System Fluorometer Signal Versus Time Injection Tap Detail Sampling Tap Detail Schematic of Typical Radioactive Tracer Application Flow Conditioner to Damp Out High-Level Disturbances Alternative Flow Conditioner Configuration to Damp Out High-Level Disturbances Positive Displacement Volumeters Method of Interpolation or Extrapolation of Positive Displacement Meter Performance From Calibration Data to Other Fluid Viscosity and Operating Conditions Tables Conversions to SI (Metric) Units Conversion Factors for Pressure (Force/Area) Conversion Factors for Specific Volume (Volume/Mass) Conversion Factors for Specific Enthalpy and Specific Energy (Energy/Mass) Conversion Factors for Specific Entropy, Specific Heat, and Gas Constant [Energy/(Mass Temperature)] Conversion Factors for Viscosity (Force Time/Area ~ Mass/Length Time) Conversion Factors for Kinematic Viscosity (Area/Time) Conversion Factors for Thermal Conductivity (Energy/Time Length Temperature Difference ~ Power/Length Temperature Difference) Thermal Expansion Data for Selected Materials SI Units Thermal Expansion Data for Selected Materials U.S. Customary Units Coefficients for Thermal Expansion Equation in C Values of Constants in the General Equation for Various Units Summary Uncertainty of Discharge Coefficient and Expansion Factor Natural Gas Analysis Minimum Plate Thickness, E, for Stainless Steel Orifice Plate Sensitivity Coefficients in the General Equation for Flow-Through Differential Pressure Meters Example 1: Steady State Uncertainty Analysis for Given Steam Flow Orifice-Metering Run Example 2: Steady State Uncertainty Analysis for Given Steam Flow Orifice-Metering Run Steady State Uncertainty Analysis for Given Gas Flow and Orifice-Metering Run vii

9 Total Steady State Uncertainty, 0.075% Accuracy Class Differential Pressure Transmitter Total Steady State Uncertainty, 0.075% Accuracy Class Static Pressure Transmitter Steady State Uncertainty Analysis for Given Gas Flow-Metering Run With a Laboratory Calibration Example Coefficient Curve Fit and Extrapolation for an Orifice-Metering Run Error Threshold Versus Relative Amplitude of P Recommended Straight Lengths for Orifice Plates and Nozzles Recommended Straight Lengths for Classical Venturi Tubes Loss Coefficients for Flow Conditioners Recommended Maximum Diameters of Pressure Tap Holes Critical Flow Function C* i and Critical Property Ratios [Ideal Gases and Isentropic Relationships, Eqs. (8-1.7) Through (8-1.9)] Versus Type of Ideal Gas Percentage Error in Method 3 Based on Critical Flow Functions [19] and Air Property Data [17] Summary of Points Plotted in Fig and Coefficients for Eq. (8-7.2) Discharge Coefficients for Cylindrical-Throat Venturi Nozzles Abscissas and Weight Factors for Gaussian Integration of Flow in Pipes Abscissas and Weight Factors for Tchebycheff Integration of Flow in Pipes Abscissas and Weight Factors for the Log-Linear Traverse Method of Flow Measurement in Pipes Loci for the Lines of Intersection Determining Measurement Stations for Flow Measurement in Rectangular Conduits Using Gaussian Integration Abscissas for Equal Weight Chebyshev Integration Transducer Calibration Linearized Calibration Data Test Data Summary Numerical Error Analysis for Gaussian Model Flow Effect of in. Misalignment on Gauss Flow Effect of Uncertainty in Pressure Measurements Summary of Uncertainty Analysis Temperature Exponents for Tracer Dyes Mandatory Appendix I Recent Developments in the Equations for the Discharge Coefficient of an Orifice Flow Meter Nonmandatory Appendices A Critical Flow Functions for Air by R. C. Johnson B Deviation of Johnson C* Values C Real Gas Correction Factors viii

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