NPSH is an important parameter to take into account when designing a circuit: whenever the liquid pressure drops below the vapor pressure, liquid boiling occurs, and the final effect will be cavitation: vapor bubbles may reduce or stop the liquid flow, as well as damage the system.
Considering the circuit shown in the picture
where
hL is the head loss between 0 and 1
p0 is the pressure at the water surface
pv is the vapour pressure (saturation pressure) for the fluid at the temperature T1 at 1
Δz is the difference in height z1 − z0 (shown as H on the diagram) from the water surface to the location 1
ρ is the fluid density
g is gravitational acceleration
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