Answer / naresh sharma

NPSH stands for net positive suction head, for any pump
acc. to the design & capacity of pump a net pressure head
is required which is called net positive suction head. if
preesure falls the NPSH, then cavitation will occur.

Answer / prasad

net positve suction head

Answer / mahendra singh

NPSH - net positive suction head.
Actully every fluid has some veporisation pressure and
below this pressure fluid can be veporise.if this
veporisation happened inside the pump means it will be the
cause of cavitaion inside the pump which can damage the
pump impellers and casing.so if we want to escape from this
possibilitym, pump suction pressure should be more than its
working fluid veporisation pressure.this min. pressure is
known as NPSH.

Answer / abdul hameed

NPSH: Net Positive Suction Head.
By definition:NPSH is an algebric sum of all the heads
(atmospheric head,vapour head, friction head, static head)
available at the suction eye of an impeller.

Answer / rakesh jaiswal

its is net positive suction head to avoid cavitation since
pressure is below the vapour pressure bubbles forms that
cause cavitation to avoid these we go for a pressure more
then vapour pressure
suction head = npsh + vapour pressure

Answer / ibrahim_mahmoud

NPSH is indication about bubble formation in pump suction side
to avoid bubble formation that results in cavitation :

(static suction head - head losses in suction pipe -
entrance kinetic losses at suction + atmospheric pressure
head - vapor pressure) > NPSH)r

the left side term is the available NPSH of our piping system

Answer / bn

NPSH; net positive suction head
NPSHA; available, is a function of the inlet piping system
NPSHR; required, is a function of the pump design and
operating speed
NPSH applies to gas free liquids !
NPSH does not apply to fluids !
Don't say 'fluid' when you mean 'liquid' !
They are not the same !!

Answer / rajeev

npsh means net positive suction head.when suction presser below then pump prassur that time bulb forme near of the impallar iye. but pump take water under pursser.that moment
that bulbs boiled this is the reason of cavitation

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