Two pumps A and B have the following characteristics. These pumps are arranged in series in a sys…

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Q-3. Two pumps A and B have the following characteristics. These pumps are arranged in series in a system with a static lift of (z2-2,) 80 ft. The pipeline comprises 6-inch diameter pipe of 1200 ft length, with minor losses 20 times the velocity head. Determine: a) the operating point (i.e., the design discharge and design head) b) the heads and efficiencies at which individual pumps are operating, and c) the overall efficiency and input power. Take f 30.022. Use the graph paper attached to plot the curves. (Lumped operating characteristics for pumps, 25 points). Take specific weight of water 62.4 lb/ft3, and 1hp 550 ft- lb/s. Pump B: 10-in 1750 rpm Pump A: 8-in 1450 rpm Q (gpm) hA (ft) Efficienc Q (gpm) he (ft) Efficiency 172 186 400 400 166 182 54 800 800 140 168 70 77 1200 144 67 1200 90 74

Two pumps A and B have the following characteristics. These pumps are arranged in series in a system with a static lift of (z_2-z_1, ) = 80 ft. The pipeline comprises 6-inch diameter pipe of 1200 ft length, with minor losses 20 times the velocity head. Determine: the operating point (i.e., the design discharge and design head) the heads and efficiencies at which individual pumps are operating, and the overall efficiency and input power. Take f = 0.022. Use the graph paper attached to plot the curves. (Lumped operating characteristics for pumps, 25 points). Take specific weight of water = 62.4 lb/ft^3, and 1hp = 550 ft- lb/s.

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