For a centrifugal pump, the net positive suction head (NPSH) is defined as:
1
NPSH = (velocity head + pressure head - vapour pressure of the liquid) at suction
2
NPSH = (velocity head + pressure head) at discharge
3
NPSH = (velocity head + pressure head - vapour pressure of the liquid) at discharge
4
NPSH = (velocity head + pressure head) at suction
5
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