Required Plots Head (m H₂O) 16 14 12 10 8 4 0.6 0.8 1.0 1.2 1.4 1.6 Head N=2800 rpm Efficiency N=2800 rpm W_sh N=2800 rpm Head N=2400 rpm Efficiency N=2400

rpm W_sh N=2400 rpm 1.8 2.0 2.2 45 40 35 30 25 20 15 Efficiency % 750 700 650 600 550 500 450 W_sh (Watt) V_dot (L/s) Figure 1: Characteristics of a two stage centrifugal pump connected in series.