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DXP - Gadgets - Electrical - Amps when HP known

Net Positive Suction Head Available
(Centrifugal Pumps Only)

Suction Supply Open to Atmosphere - with Suction Lift
Suction Supply Open to Atmosphere - with Suction Head
Closed Suction Supply - with Suction Lift
Closed Suction Supply - with Suction Head
NPSHa   =  
Results
Pb - ( Vp + Ls + hf)

Pb = Barometric pressure, in feet absolute.
Vp = Vapor pressure of the liquid at max pumping temperature, in feet absolue.
Ls = Maximum static suction lift in feet.
hf = Friction loss in feet in suction pipe at required capacity.
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