Answer / m.elangovan

NPSH = Hp + HZ – Hvp – Hf

Hp = Absolute pressure at surface of liquid
in ft
Hz = Height in ft of liquid above or below
centerline of pump.
Hvp = Vapor pressure head of liquid in ft.
Hf = Friction loss head between surface of
liquid & pump
suction pipeline in ft.
NPSH = Net Positive Suction Head in ft.
NPSHa = NPSH available + of the system.
NPSHr = NPSH required + by pump manufacturer.
NPSHa > NPSHr
As good engineering practice provide NPSHa-NPSHr = 1.5
m of liquid.

Answer / lokesh singh

above answer is quite good but ,Hvp is vapor pressure of
pumping fluid at the fluid temperature in the suction line.

secondly Hf is the friction losses from the outlet of the
suction side liquid holding tank to the eye of the pump
impeller.

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