Net Positive Suction Head (NPSH) is the total head at the pump suction nozzle minus the vapor pressure head of the fluid. NPSH Available (NPSHa) must exceed NPSH Required (NPSHr) by a safety margin (typically 1-3m) to prevent cavitation.
Formula: NPSHa = (Patm - Pvap)/(ρg) + Static Head - Friction Loss
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