Problem 1 Water at 10C flows at the rate of 900 L/min from the reservoir and through the pipe shown in Fig. 8.16. Compute the pressure at point B, considering the energy loss due to friction, but neglecting other losses. T 1.5 m 7.5 m 100-mm OD x 3.5-mm wall copper tube 12 m Flow 70 m B For the 2 x 3 - 10 centrifugal pump performance curve shown, 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. Total head (m) Impeller diameter 140 450 54 56 57 58 2x3-10 3500 RPM 58.7 120 400 9 in 58 57 350 56 100 54 80 Total head (ft) 8 in 300 250 7 in 50 HP 40 HP 60 200 31 150 6 in 40 36 41 100 46 -3 HP- 46 30 HP 25 HP 20 HP 15 HP 5 HP 46 20 50 0 20 NPSH, (ft) 7.5 HP 10 HP 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 8 in 9 in 10 in 6 in in NPSH, (m) 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 Capacity (gal/min) 0 200 400 600 800 1000 1200 1400 Capacity (L/min) Problem 3 Determine the NPSH available when a pump draws gasoline at 40C (sg = 0.65) from an underground tank whose level is 2.7 m below the pump inlet. The energy losses in the suction line total 1.18 m and the atmospheric pressure is 99.2 kPa absolute. (The vapor pressure at this temperature is hvp = 14 m). Problem 4 A rectangular channel has a bottom width of 2.75 m. Compute the hydraulic radius when the fluid depth is 0.50 m. W Free surface Problem 5 Calculate the force exerted on a stationary curved vane that deflects a 1-in-diameter stream of water through a 90 angle. The volume flow rate is 150 gal/min. (the density of water is p = 1.94 slugs/ft3 or 1.94 lb-s2/ft4. Also, 1 ft3/s = 449 gal/min) Water jet Vane