15.53 Each of two identical pumps has the following characteristics: Q (gpm) H (ft) Efficiency (%) 124 500 119 54 800 112 64 1000 104 68 1300 90 70 1600 70 67 The pumps are used in series to supply water between two tanks with a total static head of 40 ft. The pipeline is 6 in. in diameter and 1200 ft in length, with minor losses 20 times the velocity head. Determine the (a) operating condition of head and discharge, (b) head developed by each pump, and (c) input power. f= 0.022. 80

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