Light Oils - Recommended Suction Flow Velocity

Recommended flow velocity for the pump suction side

Capacity problem, cavitations 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 bore Light Oils
inches mm m/s ft/s
1 25 0.5 1.5
2 50 0.5 1.5
3 75 0.5 1.6
4 100 0.55 1.8
6 150 0.6 2
8 200 0.7 2.3
10 250 0.9 3
12 300 0.9 3

More about NPSH suction problems can be read here:

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