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What do you Mean by NPSH? How do you Calculate it?

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NPSH = Net Positive Suction Head.

NPSH is the pressure available at the pump suction after vapor pressure is subtracted.

It is calculated as:
Static head + surface pressure head – the vapor pressure of your product – the friction losses in the piping, valves and fittings
It thus reflects the amount of head loss that the pump can sustain internally before vapor pressure is reached.

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