【Daily Question】Utilities - Water Supply and Drainage - 20200222

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According to the Code for Design of Building Water Supply and Drainage, ring vent pipes should be installed in the following situations (   ).   A. On a horizontal drainage branch pipe 10 m long connected to 3 sanitary fixtures; B. When there are fixture vent pipes in place; C. On a horizontal branch pipe connected to 5 toilets; D. In high-rise buildings. Answer: B. According to paragraphs 1 and 2 of Article 4.6.3 of the current Code for Design of Building Water Supply and Drainage, the presence or absence of circular vent pipes depends on the number of sanitary fixtures connected to them and their length, and is not related to the type of building. This specification requires the installation of annular vent pipes on drainage branch pipes that are connected to 4 or more sanitary fixtures and have a length of more than 12 m, as well as on sewage branch pipes connected to 6 or more toilets. Therefore, A, C, and D are the incorrect answers. Option B complies with the provisions of Article 4.6.3, Paragraph 3, of this standard, and is therefore the correct answer