Water - Max. Suction Flow Velocities vs. Pipe Size
Recommended max. water flow velocities on suction sides of pumps.
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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:
| Pipe bore | Water Suction Velocity | ||
|---|---|---|---|
| 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 and suction problems:
- Cavitations and NPSH - An introduction to cavitation and Net Positive Suction Head NPSH
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