20 19 - Maximum Lotul hond IN EDI Minimum Lotar hend 3.000 6.000 12.000 Flow rate, ma FIGURE 1-16 System total head curves. Curve no. 3.18 Size 1 Rpm 1750 Single-stage lab head and horse-power with chamcled cast iron bowls and bronze impeller Efficiency shown for 2 or more stages Na EL ET. Malcrini stages change change 1 Imp.-C.I. 0 2 0 Imp. Om Enn 3 0 Bowl-C1. 4 0 Bowl-Bra HI A-32 cm B 31 cm 10 u s nad pea 3.0 20 11 1.0 B AL Eye arca -- 32 cm Thurst consting A.2.3 Thurst constant. B.213 Thurst constang 2.3 NPSH required NPSH required ill puinpintel, en mo 80 Max. no. std. stages - 35 Max. operating pressure in 3.900 kPa Std. latorul 0.375 Std. shaft din2.0 cm Impeller number P-2397-10 Impcller WL - 25.0 kg Bowl conn. - flanged 60 A 10 Efficiency, Add 37 cm per additional stage Enclosed line shaft 20 -72 cm 0 400 100 200 300 Discharge, m/h FIGURE 3-17 Typical vertical head-discharge curve. Chemical Engineering Using the pump head-discharge curve shown in Figure 3-17 for the system head curve shown in Figure 3-16, specify the following at the average flow rate: (1) BEP, (2) number of stages, (3) efficiency at BEP