Top 5 Most Popular  1. Pressure drop 2. Reynolds Number 3. Pressure drop K coefficients 4. Churchill equation 5. Moody diagram

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With : Q = Volumetric flowrate (m3/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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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.

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.