Answer / manish thawani (bharuch) guja

NPSH is a term That indicates whether there is enough
pressure at the pump suction for the pump to operate properly

Answer / chinmay mhaskar

It is the absolute pressure head at inlet of pump, minus the vapour pressure head corresponding to the temperature of the liquid pumped, plus the velocity head at that point.

Answer / hameedwahab

NPSH - Net Positive Suction Head - It is an Algebric sum of all heads available at suction eye of an Impeller.

Answer / magesh

NPSH is nothing but Net Positive Suction Head.
The difference between actual pressure of a liquid and it's
vapour pressure at a given temperature

Answer / anand swami

net positive suction head NPSH can be defined as the excess
of inlet total head over the head equivalent to vapour
pressure of pumped liquid.


If water close to boiling point enters a pump, it is liable
to flash to steam at the low pressure area at the eye of the
pump impeller. If this happens, bubbles of steam are formed
as the pressure drops below the water vapour. When the
pressure rises again, these bubbles will collapse and water
flows into the resulting cavity at a very high velocity.

This is known as 'cavitation'; it is noisy and can seriously
damage the pump.

To avoid this problem, it is essential to provide the best
possible Net Positive Suction Head (NPSH) to the pump so
that the static pressure is as high as possible. This is
greatly aided by locating the feedtank as high as possible
above the boiler, and generously sizing the suction pipework
to the feedpump

what is cavitation ?

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