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What Is NPSH? | Pumps Systems What Is Net Positive Suction Head? The margin of pressure over vapor pressure, at the pump suction nozzle, is Net Positive Suction Head (NPSH) NPSH is the difference between suction pressure (stagnation) and vapor pressure In equation form: NPSH = Ps ‑ Pvap Where: NPSH = NPSH available from the system, at the pump inlet, with the pump running P s = Stagnation suction pressure, at the pump
NPSH Calculation: A Step-by-Step Guide - Pumps Systems Mistakes with respect to NPSH calculations and available (NPSHa) calculations are all too frequent and expensive to correct This 5 part series from Jim Elsey will teach you what you need to know for npsh calculation