Reference: Chemical Engineering Volume 1, 6th Ed, 1999, Elsevier, J M Coulson, J F Richardson, page 375 Example 8.10


Pipe Flow Expert File: Case_23_Hydrogen_Reservoir_Pump.pfe


Problem Description:  

Hydrogen is pumped from a reservoir at 2 MN/m2 through a clean horizontal mild steel pipe 50 mm in diameter and 500 m long. 

The pressure of the gas is raised to 2.5 MN/m2 by a pump at the start of the pipe. 

The downstream pressure at the end of the pipe is 2 MN/m2. 

The conditions of flow are isothermal and the temperature of the gas is 295 K. What is the flowrate of hydrogen?


The calculation method used for the published data was the Complete Isothermal equation with Ideal Gas Law.


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Fluid Data: Hydrogen at 21.85 °C, 0.0 bar.g, density 0.084 kg/m3, viscosity 0.009 centipoise.

Pipe Data: Internal diameter 50 mm, roughness 0.05 mm.

Calculation method: Complete Isothermal Flow equation, Node Adjust Method.

Standard Atmospheric Model: 20°C, 1.01325 bar absolute.

Gas Physical Model: Ideal Gas Law


Result Comparison: 


Data Item

Published data

Pipe Flow Expert

Flow Rate (kg/second)

0.200

0.199


Commentary:

The published data and the calculated results compare well.