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Centrifugal Pump
Net Positive Suction
Head Available (NPSHA)

Flooded Suction

Net Positive Suction Head Available (NPSHA)

The net positive suction head available is a function of the pump suction system.

The Net Positive Suction Head is the absolute total suction head in feet.

The NPSH available in a flooded suction system is:

Atmospheric Pressure (- ) Vapor Pressure (+) Liquid Height (-) Friction in the Suction Line.

Suction Lift

Net Positive Suction Head Available (NPSHA)

The NPSH available in a suction lift system is:

Atmospheric Pressure (-) Vapor Pressure (-) Liquid Ht. (-) Friction in the Suction Line.

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