Net Positive Suction Head - Fluid Flow

It is possible to ensure that cavitation is avoided during pump operation by monitoring the netpositive suction head of the pump. Net positive suction head (NPSH) for a pump is thedifference between the suction pressure and the saturation pressure of the fluid being pumped.NPSH is used to measure how close a fluid is to saturated conditions. Equation 3-19 can be usedto calculate the net positive suction head available for a pump. The units of NPSH are feet ofwater.

where:

Psuction = suction pressure of the pump
Psaturation = saturation pressure for the fluid

By maintaining the available NPSH at a level greater than the NPSH required by the pumpmanufacturer, cavitation can be avoided.

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