March 2006

Rotating Equipment/Reliability

Understand cavitation in reciprocating pumps

Use these guidelines to help avoid problems

Sahoo, T., Indian Oil Corp. Ltd.

T. SAHOO, Indian Oil Corp. Ltd., West Bengal, India       Comments? Write: Net positive suction head (NPSH) is defined as the difference between suction and vapor pressures measured at the pump suction nozzle when the pump is running. In a reciprocating pump, this NPSH is needed to push the suction valve from its seat and overcome the friction losses and acceleration head within the liquid end. Piston velocity in a reciprocating pump is not uniform. It ranges from zero at the beginning and end of the stroke, to a maximum value at the midpoint of the stroke. The out

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