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. Source ...

The SludgeKat™, Gorman-Rupp’s new self-priming, positive displacement, hydraulic piston pump, is designed to handle the applications involving heavy sludges and slurries where other pumps fail.

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Another key differentiating factor in positive displacement pumps is that they have a low internal velocity and, thus, there is no significant pressure on the pumps’ internal components.

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An electric vacuum priming pump is a positive displacement air pump. Activating the vacuum primer removes air from inside the suction and discharge casings of the fire pump.

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.