How to Select a Pump with the Highest Efficiency
· As shown in figure 3, maximum obtainable pump bep efficiency occurs in the specific speed range of 2,000 to 3,500, with higher speeds (and flow rates) increasing specific speed, and higher heads lowering the value. So, if higher or lower speed selections (say 1,180 RPM vs. 1780 RPM), higher or lower flow rates, and/or higher heads move the pump