【Daily Question】Utilities - Water Supply and Drainage - 20200320

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This post was last edited by hesonchang214 on 2020-3-20 at 10:11. Among the following statements regarding the purpose of installing ventilation ducts inside buildings, which one is incorrect? A. Maintain pressure balance within the drainage pipes to prevent damage to the water seal due to pressure fluctuations. B. Remove toxic and harmful gases outside the building. C. Reduce noise in the drainage system. D. Assist in collecting wastewater and draining it outside the building. Answer: D. A, B, and C are the purposes for installing vent pipes in the system; therefore, they are not the correct answers. Option D is not the purpose of installing vent pipes, nor does it comply with the provisions of Article 4.6.7 of the current Code for Design of Building Water Supply and Drainage Systems. If a vent pipe is used to carry other types of drainage, it not only reduces the cross-sectional area available for ventilation but also creates new pressure fluctuations within the drainage stack; a vent pipe should be used solely for ventilation purposes