Question

Question D.1 A2 Not sure Water flows between two tanks connected by a 100 m long pipe as shown in figure D1-1 below The tanks have a free surface height difference of 15 m and are both open to atmosphere. The first 30 m of pipe from the upper tank (section 1) has an internal diameter of 50 mm and a friction factor of 0.006, whilist the remaining 70m of pipe (section 2) has an internal diameter mm and a friction factor of 0.007. The change in pipe section is to be considered as sudden enlargement gnoring all minor losses except those associated with the change in section, determine (0) The flow rate of water between the two tanks (i) The power required to pump the water back up from the lower to the upper tank at the same flow (20 marks [5 marks] rate (assuming the head loss remains constant) Take density of water to be 1000 kg/m Section 2 Length #70 m Diameter 0.08 m f-0.007 15 m Length-30 m Diameter 0.05 m 0 006 Figure D1-1

Answer 1

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