Orifice Metering of Natural Gas (AGA 3) Part 4 by American Gas Association

By American Gas Association

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Extra resources for Orifice Metering of Natural Gas (AGA 3) Part 4

Example text

Calculate required fluid properties at ~, Pf and other specified fluid conditions. 3. d. Calculate the appropriate fluid expansion factor. 7B. e. 8. f. 9. If the value is outside the range of applicability given in Part I, the value of Cd(FI') should be flagged as being outside the uncertainty statement given in Part 1. g. 12) as required. 1 A Procedure Calculation of Orifice Plate Bore Diameter from Measured Diameter Input: = at d", Td 1;- linear coefficient of thermal expansion of the orifice plate material.

78 ~~~ Calculation of Incompressible Fluid Expansion Factor Input None Output Y = expansion factor. Procedure: Step 1. Expansion factor for incompressiblefluid is definedto be unity. 8 (4-31) Calculation of Iteration Flow Factor Input d = orifice plate bore diameter calculatedat flowing temperature,Tj. D = meter tube internal diameter calculated at flowingtemperature, Tj. M = orifice differentialpressure. l Pt,p = velocityof approachfactor. = absolute viscosity of fluid flowing. = density of the fluid at flowingconditions, If, Y = expansion factor.

Z= Or: average orifice plate bore diameter measured in accordance with Part 2. measured orifice plate bore diameter temperature. linear coefficient of thermal expansion of the orifice plate material. average meter tube internal diameter measured in accordance with Part 2 of this standard. measured meter tube internal diameter temperature. linear coefficient of thermal expansion of the meter tube material. dr = orifice plate bore diameter at reference temperature, Tj, determined according to Part 2.

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