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Calculation of natural gas flow and pressure drop through pipe line is for compressible flow,
based on the Renouard Equation:
where is:
p1 - pressure on the start of pipe line in bar
p2 - pressure on the end of pipe line in bar
rho - relative density view table
L - lenght in km
Q - flow rate in m3/h
D - pipe diameter in mm
It important to have in mind that flow rate Q is to be used at standard conditions which are:
pressure p = 101325 Pa
temperature T = 288 K
Relative density rho is calculated as follows:
where is:
rho - relative density (arround 0.64 kg/m3)
rho AIR - air density at standard conditions, which is 1.226 kg/m3
rho NG - natural gas density at standard conditions, which depends on the natural
gas mixture (arround 0.78 kg/m3)
Mass flow in calculator is calculated as follows:
where is:
G - mass flow rate
Also, in calculator, for calculation of flow rate at real conditions at start and end of pipe line,
following equations are used:
where index 1 represents the state at the start of gas line and 2 is the state at the end of gas line.
Velocities in these two positions are calculated using well known equations:
Go to calculator.
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