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Water - Max. Suction Flow Velocities vs. Pipe Size

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Capacity problems, cavitation and high power consumption in pumps, are often results of the conditions on the suction side.

In general - as a rule of thumb - keep the suction fluid flow speed below the following values:

Water - Max. Suction Flow Velocities
Pipe boreMax. Suction Velocity
inchesmmm/sft/s
1 25 0.5 1.5
2 50 0.5 1.6
3 75 0.5 1.7
4 100 0.55 1.8
6 150 0.6 2
8 200 0.75 2.5
10 250 0.9 3
12 300 1.4 4.5

More about NPSH and suction problems:

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