Stainless steel vertical multistage pump NPSH calculation and calculation formula of the inlet pressure

stainless steel vertical multistage water pump NPSH minimum inlet pressure formula of calculation and

if the pressure is lower than stainless steel vertical multistage water pump conveying liquid vapor pressure, cavitation can occur, to avoid cavitation, ensure the pump inlet side has a minimum pressure, the maximum suction H [ m] According to the formula:

H - Pbx 10。 2 - 汽蚀余量, Hf- 高压, The Hs

Pb [= the atmospheric pressure bar] ( Atmospheric pressure can be set to 1 bar)

in a closed system, Pb for system pressure [ bar]

NPSH = net positive suction head [ m] ( From the pump NPSH curve may be the maximum flow of reading)

Hf = entrance line loss [ m]

Hv = [steam pressure, m]

the Hs = safety margin - Minimum 0. 5 m head

as calculated H is positive, the water pump can run under the condition of maximum H suction.

as calculated H negative, there must be a minimum inlet pressure head of H.

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