Question

A suction pump you recently purchased shows that the NPSHr = 12 ft. Explain what is...

A suction pump you recently purchased shows that the NPSHr = 12 ft. Explain what is
this. If cavitation still occurs in your piping system, what would you do to avoid this issue?

Engineering   Mechanical-Engineering   
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Answer #1

NPSH stands for net positive suction head.

NPSH gives minimum head to be maintained at auction side of the pump. NPSH depends on both pump parameters and liquid of operation.

Because, NPSH can also be said like, the difference between absolute pressure head and cavitation pressure of the liquid.

Absolute pressure head governs by pump parameters.

Cavitation pressure is governs by liquid of operation.

NPSH is specified by manufacturer of the pump.

Even though cavitation occurs in pipe system we can do any of the following,

1. Reduce voltage supply to motor to reduce its RPM.

2. Decrease the temperature of the operating liquid.

3. Raise the liquid level at suction side of the pump.

4. Use impeller inducer to rise the head artificially at suction point.

5. Replace the pump with parallels arranged two lower capacity pumps.

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