AGA XQ9210 : 0

3.1 Introduction
     3.1.1 Application
     3.1.2 Basis for Equations
     3.1.3 Organization of Part 3
3.2 Symbols, Units, and Terminology
     3.2.1 General
     3.2.2 Symbols and Units
     3.2.3 Terminology
3.3 Flow Measurement Equations
     3.3.1 General
     3.3.2 Equations for Mass Flow of Natural Gas
     3.3.3 Equations for Volume Flow of Natural Gas
     3.3.4 Volume Conversion From Standard to Base
           Conditions
3.4 Flow Equation Components Requiring Additional
     Computation
     3.4.1 General
     3.4.2 Diameter Ratio
     3.4.3 Coefficient of Discharge for Flange-Tapped
           Orifice Meter
     3.4.4 Velocity of Approach Factor
     3.4.5 Reynolds Number
     3.4.6 Expansion Factor
3.5 Gas Properties
     3.5.1 General
     3.5.2 Physical Properties
     3.5.3 Compressibility
     3.5.4 Relative Density
     3.5.5 Density of Fluid at Flowing Conditions
APPENDIX 3-1 - ADJUSTMENTS FOR INSTRUMENT CALIBRATION
APPENDIX 3-B - FACTORS APPROACH
APPENDIX 3-C - FLOW CALCULATION EXAMPLES
APPENDIX 3-D - PIPE TAP ORIFICE METERING
APPENDIX 3-E - SI CONVERSIONS
APPENDIX 3-F - HEATING VALUE CALCULATION
APPENDIX 3-G - DEVELOPMENT OF CONSTANTS FOR FLOW
               EQUATIONS

Defines practical guidelines for the measurement of natural gas. The Mass flow rate and volumetric rate methods are presented in conformance with North American industry practices.