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The fluid velocity in a pipe is a fundamental data to calculate to be able to characterize the flow in a pipe, thanks to the Reynolds number, and size a pipe circuit calculating the pressure drop expected for a certain flow.
When designing the pipe, it is necessary to chose a fluid velocity to have good compromise in between pressure drop and economics, some recommendations are given below.
With :
Q = Volumetric flowrate (m^{3}/s)
D = Pipe diameter (m)
u = Fluid velocity in pipe (m/s)
Note that the velocity will be constant for a non compressible fluid but will vary with a compressible fluid such as a gas. For a gas it is therefore necessary to slice the pipe layout in several sections in order to recalculate the velocity along the pipe.
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Fluid  Recommended velocity 

Water 
1.52.5 m/s [1] 12.5 m/s [2] 
Air  1030 m/s [1] 30 m/s [2] 
Steam 
2040 m/s [1] HP : 45 m/s [2] LP : 30 m/s [2] 


Gas Process flows  1545 m/s 
Dry gas  30 m/s [2] 
Wet gas  18 m/s [2] 