Simply put, pump net positive suction head (NPSH) is the excess head (or pressure) exerted on the pump’s suction that keeps the liquid from boiling.

Deaerator pressure decay and boiler feedwater pump net positive suction head margin during a deaerator pressure fluctuation can be calculated using the methods described in this article.

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The actual pressure at pump suction then corresponds to deaerator pressure of 59.45 psi + 34 psi (where 34 psi equals the static head minus friction loss) = 93.45 psi.