Suction Flow Velocities of Water

Recommended water flow velocity on suction side of pump

Capacity problem, cavitation and high power consumption in a pump, is often the result of the conditions on the suction side. In general - a rule of thumb - is to keep the suction fluid flow speed below the following values:

Pipe boreWater
inches mm m/s ft/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 suction problems can be read here:

Related Topics

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