【Daily Question】Utilities - Water Supply and Drainage - 20200303

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Among the following projects, the selection of pipe diameter that does not comply with the current \"Code for Design of Building Water Supply and Drainage\" is (  ).   A. In gravity-fed rainwater drainage systems, the suspension pipes and vertical pipes use pipes with a diameter of 75 mm. B. The main pipes beneath the roads in the residential area are made of plastic pipes with a diameter of 315 mm. C. Based on calculations, the diameter of the horizontal pipes upstream of the pressure-fed roof rainwater drainage pipes is 100 mm, while the diameter of the vertical pipes downstream is 75 mm. D. The rainwater inlet pipes surrounding the buildings in the residential area are made of cast iron pipes with a diameter of 200 mm. Answer: A. Options B and D comply with the provisions of Table 4.9.25 in Article 4.9.25 of the current “Code for Design of Building Water Supply and Drainage Systems”. Option C complies with the provisions of Table 4.9.29 in Article 4.9.25 of the current \"Code for Design of Building Water Supply and Drainage Systems\". Option A does not comply with the provisions of Table 4.9.25 in Article 4.9.25 of the current \"Code for Design of Building Water Supply and Drainage\"; the diameter of the rainwater drainage riser should be 100 mm rather than 75 mm