Influence of Vent Pipe Bottom Connection Position on the Discharge Capacity of Two Building Drainage Pipe Systems
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 13, Issue 4
Abstract
The fierce positive pressure problem at the bottom of a building drainage pipe system can cause building discharge backflow or indoor environmental pollution. Full-scale discharge experiments on the vent pipe bottom position were conducted in a 60-m-high experimental tower. The vent pipe bottom connected to the drainage stack and to the horizontal main was examined in an H-joint connected dual-stack system and a circuit vent drainage pipe system. Pressure limit values, water seal losses of sanitary fixtures, and airflow rates were investigated to determine system discharge capacities. The maximum discharge flow rate of the H-joint connected dual-stack system with the vent pipe bottom connected to the drainage stack was . In comparison, the maximum discharge flow rate of the improved system was increased to . For the circuit vent drainage pipe system, the improved bottom connection mode increased the discharge capacity by 200%.
Practical Applications
A vent pipe end connected to the horizontal main could increase a pipe system’s discharge capacity, which means the system design could adopt a smaller pipe size than usual. This improved connection mode minimizes the material of building drainage pipe systems and reduces associated engineering costs.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by reasonable request.
Acknowledgments
This research has been supported by the National Natural Science Foundation of China (Grant No. 51978536), the Fundamental Research Funds for the Central Universities (Grant No. 2042021kf0059), and the China Postdoctoral Science Foundation (Grant No. 2021M702529). The National Building Drainage Piping System Technology Centre in Gaoping, Shanxi Province, China provided us with massive supports, including the experimental equipment and technical guidance. The required test materials were provided by SUNS Industrial Group.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 13 • Issue 4 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 12, 2021
Accepted: Jun 2, 2022
Published online: Jul 20, 2022
Published in print: Nov 1, 2022
Discussion open until: Dec 20, 2022
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