Answer / ashish patel

npsh is the net positive suction head means that is the
actual head at the suction port because upto the suction
port the pressure of the fluid will be reduced due to the
vapour pressure acted on moving fluid so it's obvious that
the pressure at the suction port is reduced so reduced head
and it called npsh.

Answer / atul gupta

NPSH IS ATERM USED TO MEASURE CAVITATION EXTENCE.

NPSH=Ha-Hv-Hs-hf

whre,
Ha=atm head
Hv=vapour press. head
Hs=section head
hf=friction loss.
and then it is further used to calculate THOMA'S CAVITATION FACTOR:
AS,(sigma)=NPSH/TOTAL HEAD

Answer / thambirajan

NPSH=APSOLUTEPRESSURE AT PUMPSUCTION-VAPOUR PRESSURE AT PUMP
TEMPERATURE


That is varied by pump casing and impeller material

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