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NPSH refers to net positive suction head. NPSH is particularly relevant inside centrifugal slurry pumps and turbines,which are parts of a hydraulic system that are most vulnerable to cavitation.
It may refer to one of two quantities in the analysis of cavitation.
NPSHa: NPSH available at slurry pump suction flange, at given capacity and temperature
NPSHr: NPSH required at slurry pump suction flange, at given slurry pump speed, capacity and temperature to prevent cavitation.Cavitation is a phenomenon that adversely affects the performance of a centrifugal slurry pump and it must be avoided during normal operation.
The onset of cavitation in a slurry pump, at any given speed and capacity, is brought about by a particular combination of temperature and pressure at the pump suction flange.
The absolute total head is called the Net Positive Suction Head or NPSH. The letter P tells us that NPSH, by definition, can never be a negative number.
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