For the 2 × 3 - 10 centrifugal pump performance curve shown in Fig. 13.28, at what head will the pump having an 8-in impeller operate at its highest efficiency? List the pump€™s capacity, power required, efficiency, and the required NPSH at that head.

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Impeller diameter 10 in 3136-41-46 140 2x3- 10 3500 RPM 450 151 54 56 57 58 58.7 400 9 in 120 58 57 350 100 S in 300 50 HP 80 250 7 in 31 40 HP 200 60 46 30 HP 150 |6 in 36 4146 40 25 HP 20 HP 100 -3 НР- 15 HP- 5 HP 46 17.5 HP 10 НP | 20 50 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 20 8 in 9 in 10 in 7 in 6 in 10 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 Capacity (gal/min) 1400 200 400 600 800 1000 1200 Capacity (L/min) Total head (m) (u) 'HSAN Total head (ft) (1) 'HSAN