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【Daily Question】Utilities - Water Supply and Drainage - 20200226

2020-02-26View Original

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Inside a certain building, there are 5 drainage riser vent pipes that need to be combined before extending to the roof. Two of these vent pipes have a diameter of DN75 mm, while the other 3 have a diameter of DN50 mm. The minimum diameter of the combined vent pipe is (   ).   A. DN50mm     B. DN75mm     C. DN100mm     D. DN150mm   Answer: C According to Article 4.6.16 of the current ‘Code for Design of Building Water Supply and Drainage’, when the vent pipes of two or more sewage risers are connected together, the cross-sectional area of the combined vent pipe should be equal to the cross-sectional area of the largest vent pipe plus 0.25 times the sum of the cross-sectional areas of the remaining vent pipes

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