【Daily Question】Utilities - Water Supply and Drainage - 20200123
Thread Content
Which of the following statements regarding the height of the water seal is correct? ( ) A. The water seal relies on the pressure of clean water at a certain height to counteract changes in air pressure within the drainage pipe, thereby preventing air from entering the indoor space; therefore, the height of the water seal depends only on these changes in air pressure. B. In practice, the higher the height of the water seal, the better. C. The height of the water seal should not be less than 100 mm. D. If the height of the water seal is too low, air in the pipe can easily overcome the pressure of the clean water in the seal and enter the indoor space, contaminating the environment. Answer: D
D. The water seal height is too low, allowing the gas inside the pipe to overcome the water seal’s pressure and enter the room, thereby contaminating the environment