What is NPSH?

Question

What is NPSH?

Accepted Answer

NPSH stands for Net Positive Suction Head. It is the difference between the pressure at the suction of a pump and the vapor pressure of the liquid being pumped.

NPSH is a critical parameter in pump selection and operation.
It determines whether the pump will cavitate or not.
NPSH is affected by factors such as fluid temperature, pressure, and viscosity.
If the NPSH available is less than the NPSH required, the pump will not operate efficiently and may even fail.
NPSH can be calculated using various formulas, such as the Rayleigh equation or the empirical formula.
NPSH is usually expressed in meters or feet of liquid.
An example of NPSH calculation: If the suction pressure is 10 psi and the vapor pressure of the liquid is 2 psi, the NPSH is 8 psi.

What is NPSH?

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