Dynamic Flow Computers
SFC332L Manual
Flow Equations
— 3-2
Date: 8/1/2019
API 14.3
For more information, please see
Orifice Metering of Natural Gas
, 3
rd
edition.
Mass Flow Rate
=
𝜋
4
×
𝑁
𝑐
× 𝐶
𝑑
×
𝐸
𝑣
×
𝑑
2
× Y ×
√2𝐷𝑃 × 𝐷𝑒𝑛𝑠𝑖𝑡𝑦
× .001
Net Flow Rate
=
𝑀𝑎𝑠𝑠 𝐹𝑙𝑜𝑤
𝐵𝑎𝑠𝑒 𝐷𝑒𝑛𝑠𝑖𝑡𝑦
Gross Flow Rate
=
𝑀𝑎𝑠𝑠 𝐹𝑙𝑜𝑤
𝐹𝑙𝑜𝑤𝑖𝑛𝑔 𝐷𝑒𝑛𝑠𝑖𝑡𝑦
Where:
𝑁
𝑐
= Units Conversion Constant
𝐶
𝑑
= Orifice Plate Coefficient of Discharge
𝐸
𝑣
=
1
√1−𝛽
4
= Velocity of Approach Factor
d = Orifice plate bore diameter
Y = Expansion Factor
DP = Orifice Differential Pressure
US unit
𝑁
𝑐
323.279
Density
lb/
𝑓𝑡
3
Gross Flow Rate/HR
MCF
Net Flow Rate/HR
MSCF
Mass Flow Rate/HR
MLB
Summary of Contents for SFC332L
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