【Daily Question】Utilities - Water Supply and Drainage - 20190220

2019-02-20View Original

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The elevation of the terrain at point A and point B is 62.0 m and 61.5 m respectively. If the head loss in the pipe segment AB at a certain flow rate is 1.5 m, and the service head at point B is 20 m, then the service head at point A is ( ). a, 20mb, 21mc, 21.5md, 23m Answer: b. The node water pressure is the sum of the ground elevation at that node and the service head at that point; therefore, the water pressure HB at the end of the pipe section B is 61.5 + 20 = 81.5 m. The pressure difference between the start and end of the pipe section is equal to the head loss from the start to the end of that section, that is, HA－HB＝hA-B. Therefore, the node water pressure at point A is HA = HB + hA – B = 81.5 + 1.5 = 83 m.

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【Daily Question】Utilities - Water Supply and Drainage - 20190220

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