Pump NPSH Available

Atmospheric, vapor, static, and friction heads to NPSHa with cavitation flag.

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Formula and source

NPSHa = H_atm + H_static_source − H_friction − H_vapor (all in ft of pumped fluid). H_atm from elevation-lapse; H_vapor from a public engineering psi-by-temperature table converted via 2.31 ft/psi.

Hydraulic Institute by name; ASHRAE Fundamentals water-property tables.

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