a speed of (50 cm/sec) through the first section of a pipe with a diameter of (25 cm). The diameter of the pipe changes to (15 cm) after the pump. Calculate the flow rate in both sections of the pipe in units (lit/ sec) and (kg/hr)? What is the horsepower of the pump needed to raise the water to a height of (12m) from the base level where the difference in pressure at both ends of the pump is (5 x 106 Pa)?

The system presented on Figure 1 pumps water from the left reservoir to ensure a water in the elevated basin stays level. Knowing that the offset from water-surface to water-surface 7.5m and the water temperature is 5oC, you must: a) Determine the out-flow from the basin's orifice; b) Determine the efficiency of the pump (n) feeding the basin if the pump's absorbed power is 2550W; Consider that hs=0 c) Determine how long it will take for the basin to fully empty if the pump ceases to function. Lconduit 20m; Chw-130; D=0.15m 1m h Dorifice =0.075m; h=1.2m; Dimension of the rectangular basin: 3m x 2m *The orifice coefficient can be presumed to be 0.9 Figure 1

3) A centrifugal pump delivers water between two reservoirs with a 300 ft. elevation difference (Az). The 12-in diameter suction pipe (f1= 0.020) is 100 ft. long (L1) and the 10-in diameter discharge pipe (f2= 0.026) is 5000 ft. long (L2). The pump has a performance curve defined by the equation: h, = 375 - Q² where h, is the pump head in feet and Q is the discharge in ft/s. a) Calculate the discharge, Q. b) Calculate the NPSHA. Assume standard atmospheric conditions, 60°F water, and a pump elevation 8 ft. above the lower reservoir Az D, L2 2 D, Ly. ft LOM

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