T. SAHOO, Indian Oil Corp. Ltd., West Bengal, India
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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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