Net Positive Suction Head: NPSHR and NPSHAWater VaporEmergency Departments
The original LPSI pumps were supplied early 1970's and for safety purposes it was decided to overhaul these pumps to improve NPSHR (i.e. NPSH3). The rerate consisted of replacing the existing impeller with a new design yielding close to identical head performance characteristic, yet better ...
The pump manufacturer may recommend a safety margin to be applied between the pump net positive suction head 3 (NPSH3) and the NPSHA. The principal parameters governing the safety margin include pump size, type, and specific speed, the power concentration of the pump, impeller design, the ...