Pump net positive suction head
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Is it better for a pump to have a higher NPSH or a lower one? Can it be determined whether cavitation will occur based on the installation location of the pump? What is the basis for the judgment? Dear sea friends, please provide answers and guidance!
The lower the NPSH of a centrifugal pump, the better its cavitation resistance. Calculation of pump system characteristics and determination of the relative installation height of the pump
Neither being too large nor too small is good; it needs to be designed reasonably
Pumps usually indicate the required NPSHr, which represents the minimum head at the pump’s inlet; if the pressure is lower than this value, cavitation may occur. Therefore, the lower this value, the better. NPSHa (effective net positive suction head, net positive suction head available to the device) can be roughly considered as the suction liquid level minus the pipe losses. Ensuring that this value is greater than npshr prevents cavitation; the higher this value, the better.