Net Positive Suction Head (NPSH)

What is Net Positive Suction Head (NPSH) and how cavitation is formed?

The net positive suction head (NPSH) is defined as the difference between the net inlet head and the head corresponding to the vapour pressure of the liquid. It may be noted that when the pressure at the suction falls below the vapour pressure of the liquid, then cavitation will be formed.

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