Abstract
To prevent cavitation on start-up, a centrifugal pump needs a certain amount of extra suction head above its required NPSH (net positive suction head). NPSH available is the vapor pressure of the liquid subtracted from the actual pump suction pressure. The required NPSH is the actual pressure observed at the suction of the pump, expressed in feet or potential energy. The greater the flow into the eye of the pump's impeller, the greater is the required NPSH. Frictional losses in the pump's suction line and nozzle losses will also increase the required NPSH for the centrifugal pump.
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