For the figure shown, water flows at a rate of 2.5 ft3/s and the total head loss is equal to 61 times the velocity head in the pipeline. Diameter of the pipe is 8 inches throughout its length. Calculate the power (in horsepower) provided by the pump. Round off your answer into a whole number. Answer: P = hp 50 ft

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At what speed, when pumping water, should the 105 cm pump of the figure below run to realize, at highest efficiency, (a) a head of 30 m? For this condition, what are the resulting (b) flow rate, and (c) brake horsepower? n=710 r/min 120 7.5 NPSH 6.0 105 105-cm dia. 4.5 3.0 90 96.5-cm dia. 75 89-cm dia. 86% 84% 45 1000 bhp 30 15 30 45 60 75 90 105 m/min por on NPSH, m 1500 bhp 1250 bhp %88 %88 • %08 %09 Total head, m

Problem 2 The 32-in diameter pump has a performance curve as below. The pump is used at 1170 rpm in a system whose head curve is hp = 110 + 1.5Q² (in ft), with Q in units of thousands of gallons of water per minute. Please estimate the discharge and brake horsepower (BHP) required for (a) one pump, (b) two pumps in parallel, and (c) two pumps in series. Total head, ft n = 1170 r/min 800 700 36-in dia. 600 32-in dia. 500 400 28-in dia. 300 65% 72% 78% %78- 1500 bhp 200 0 8 12 16 NPSH 85% 87% 88% 20 20 87%x 3500 bhp 3000 bhp 2500 bhp 2000 bhp 24 28 U.S. gallons per minute x 1000 50 30 20 NPSH, ft