【Daily Question】Utility Engineering – Water Supply and Drainage – 20191026

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When water supply pipes are installed concealed, the following requirements shall be met; among them, which item is incorrect? A. It can be directly laid within the structural layers of the building. B. Main pipes and vertical pipes should be laid in ceilings, pipe shafts, or pipe galleries; branch pipes are preferably laid in the finishing layer of the floor or along the walls in pipe grooves. C. The outer diameter of water supply branch pipes laid in the finishing layer or pipe grooves should not exceed 2.5 mm. D. For water supply pipes laid in the finishing layer or pipe grooves, plastic materials, metal-plastic composite pipes, or corrosion-resistant metal pipes are suitable. Answer: A is the correct answer. Options B, C, and D respectively comply with the provisions of Paragraph 2 of Article 3.5.18, Paragraph 2 of Article 3.5.18, and Paragraph 4 of Article 3.5.18 of the current “Code for Design of Building Water Supply and Drainage Systems”; Option A does not comply with the provisions of Paragraph 1 of Article 3.5.18 of the same code.