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the pump and 700m after the pump) as shown in Figure 2(b). A pump operated at H, = 280- 650 is fitted above the lower reservoir, where H, is the pump head and Q is the flow rate in the pipe. i) If the friction factor in the pipe is a constant of 0.03 and other losses are negligible, determine the flow rate in the pipe. 15/251 ii) To avoid cavitation at the suction side, what is the maximum height of the pump 2,7 The vapor pressure of water is -10m. (5/25) 300m AOD 200m AOD Pump Ze Figure 2(b) End of Question 2 [25 marks in total]
the pump and 700m after the pump) as shown in Figure 2(b). A pump operated at H, = 280- 650 is fitted above the lower reservoir, where H, is the pump head and Q is the flow rate in the pipe. i) If the friction factor in the pipe is a constant of 0.03 and other losses are negligible, determine the flow rate in the pipe. 15/251 ii) To avoid cavitation at the suction side, what is the maximum height of the pump 2,7 The vapor pressure of water is -10m. (5/25) 300m AOD 200m AOD Pump Ze Figure 2(b) End of Question 2 [25 marks in total]
Question 2 (a) Use the Hardy-Cross method to determine the flow rates and their directions in all the pipes of the network as shown in Figure 2 with given inflow/outflow at each junction. Head loss due to friction in all the pipes may be taken as (8fLQ2)/(m²gD5) where Q is the flow rate. The pipe diameter D, length L and friction factor f are given in the Table Q2. All other losses are negligible. [10/25] Pipe Diameter Length L (m) Friction factor D (m) f AB 0.35 200 0.02 BC 0.5 200 0.05 CD 0.35 200 0.03 DE 0.4 200 0.02 EA 0.4 200 0.01 E 2.5m³/s A Table Q2 B 1.5m³/s 0.5m³/s 3.5m³/s D Figure 2(a) (b) If one more pipe is added to connect E and C, briefly describe how to determine the flow rate in pipe EC. [5/25] Water is lifted from a reservoir at lower elevation (200m AOD) to a reservoir at higher elevation (300m AOD) through a raising main with diameter of 0.6m and length of 780m (80m before Page 3 of 9