In a pump, the difference between the actual pressure, or head, of a liquid available (measured on the suction side) and the vapor pressure of that liquid is called Net Positive Suction Head (NPSH) available. The minimum head required to prevent cavitation with a given liquid at a given flow rate is called Net Positive Suction Head __________. Inadequate NPSH can result in cavitation.

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The minimum head required to prevent cavitation is called Net Positive Suction Head Required (NPSHr). Surplus and reserve are not terms used in the context of NPSH.

In a Pump, the Difference Between the Actual Pressure, or Head