Answer Posted / 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

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