YANXin,GUANYu-xi,FANGZheng,et al.Influence of Bottom Connection on Capacity of Secondary Vent Riser in Building Drainage System[J].China Water & Wastewater,2024,40(1):62-67.
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Influence of Bottom Connection on Capacity of Secondary Vent Riser in Building Drainage System

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第1期 Page: 62-67 Column: Date of publication: 2024-01-01
Author(s):
YAN　Xin1; 2;  GUAN　Yu-xi2; 3;  FANG　Zheng2;  REN　Shao-long4;  YIN　Hao-ran2; 5
（1. School of Environmental and Municipal Engineering， North China University of Water Resources and Electric Power， Zhengzhou 450000， China； 2. School of Civil Engineering， Wuhan University， Wuhan 430072， China； 3. Shenzhen Water and Environment Group Co. Ltd.， Shenzhen518031， China； 4. National Building Drainage System Technology Center Laboratory， Shanxi Xuanshi Industrial Group Company， Jincheng 048400， China； 5. SZMS Nanshan Innovation School， Shenzhen 518000， China）
Keywords:
vent pipe;  pipe bottom connection position;  discharge capacity;  water seal loss
Abstract:
The water flow rate at the bottom of drainage riser is large, so the flow pattern is extremely volatile and often produces great positive pressure. Therefore, this paper compared the pressure fluctuation, water seal loss and airflow rate of each test floor in a circuit vent drainage system belonged to a 60-meter-high full-size experimental tower with different bottom connection modes of secondary vent riser. The maximum discharge capacity of the system with bottom of the vent riser connecting to the drainage riser was 8.5 L/s, while the maximum discharge capacity of the system with bottom of the vent riser connecting to the horizontal main was increased by 100% (17.0 L/s). For the system with vent riser connecting to the drainage riser and vented by the top of drainage riser, the maximum discharge capacity was only 7.0 L/s when the vent riser was not connected to the bottom main, and the maximum discharge capacity of the system with vent riser connecting to the bottom main was 12.5 L/s. Therefore, the bottom of the vent riser connecting to the horizontal main greatly improved the drainage capacity of the drainage system, and the drainage capacity could be improved by changing the connection mode in engineering.
Last Update: 2024-01-01