【Daily Question】Utility Engineering – Water Supply and Drainage – 20191011

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Which of the following statements regarding the selection of the diameter of water meters in domestic water supply systems does not conform to the current \"Code for Design of Building Water Supply and Drainage\"? (  )   A. In a domestic water supply system where the water consumption is uneven, the diameter of the water meter should be determined based on the fact that the designed flow rate of the domestic water supply does not exceed the overload flow rate of the water meter. B. In a domestic water supply system where water consumption is uniform, the diameter of the water meter should be determined based on the fact that the designed flow rate of the domestic water supply does not exceed the normal operating flow rate of the water meter. C. In cases of fire fighting, the water meters for both domestic water and fire-fighting water must be checked by considering the designed flow rate of domestic water plus the fire-fighting flow rate; this combined flow rate should not exceed the normal operating flow rate of the water meter. D. The diameter of the water meter should preferably match that of the connections in the water supply pipes. Answer: C is the correct answer. Options A, B, and D comply respectively with Paragraph 1 of Article 3.4.18, Paragraph 2 of Article 3.4.18, and Paragraph 3 of Article 3.4.18 of the current \"Code for Design of Building Water Supply and Drainage\". Option C does not comply with the provisions of Paragraph 4, Article 3.4.18 of the current Code for Design of Building Water Supply and Drainage. Since fire fighting involves abnormal water use and the flow is only temporary, the verified flow rate should not exceed the overload flow rate of the water meter.