Page < 4 > of 5 6) Two pumps whose characteristics and efficiencies are shown in Table 1 and Table 2 respectively are co

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Page 4 Of 5 6 Two Pumps Whose Characteristics And Efficiencies Are Shown In Table 1 And Table 2 Respectively Are Co 1 (89.51 KiB) Viewed 59 times

Page < 4 > of 5 6) Two pumps whose characteristics and efficiencies are shown in Table 1 and Table 2 respectively are connected in parallel, to pump water through a 800 m long 450 mm diameter pipe with λ=0.023, from the main feed reservoir with a water surface RL = 54 m to the main supply reservoir with an RL of 70 m at the discharge point for the pipe into the reservoir. Discharge {/s Head (m) Efficiency (%) TABLE 1: PUMP A 0 20 40 60 25 23.5 80 100 22 20.5 18 14.5 70.5 68 60.5 48 120 140 10 5 28 64 - TABLE 2: PUMP B 0 20 40 60 80 100 120 Discharge /s Head (m) 30 28.5 27 25 23 21 140 160 180 18 15 10 70 59 46 22 29.5 50 Efficiency (%) 66 74 78 78 i. Construct the head discharge curve for pumps A and B operating in parallel on the graph paper. (6 marks) ii. Draw the system curve and determine the flow rate for both pumps operating. (4 marks) iii. Pump B is shut down for a major overhaul. The supply reservoir has a capacity of 20,000 m³ and the draw off is 12,100 m³ /day. What is maximum number of whole days before Pump B must be back in service assuming the reservoir was full at the beginning of the shutdown. (5 marks) ZOOM +