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Light Oil Suction - Flow Velocities

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Capacity problems, cavitation and higher power consumption in pumps, are often the result of conditions on the suction sides of the pumps.

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

Light Oil Suction - Flow Velocities
Pipe boreLight Oil Velocity
inchesmmm/sft/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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