What Is NPSHr? How To Calculate This Value?


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Aisha Profile
Aisha answered
NPSHR stands for Net Positive Suction Head Required (NPSHR). It is a function of the pump design at the operating point on the pump performance curve. The Net Positive Suction Head is basically the absolute total suction head in feet. Its formula is as follows:

Atmospheric Pressure (- ) Vapor Pressure (+) Liquid Height (-) Friction in the Suction Line.
For details see the link below;
Anonymous Profile
Anonymous answered
This value (NPSHr) is obtained from a pump curve.  Consult the pump manufacturer for the curve.

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