Experimental study on air pressure variation in a horizontal pipe of single-stack drainage system

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Tingchao YuYu Shao

Abstract

The water trap seal under the sanitary appliances is the primary defense against the ingress of foul gases and odors. However, research on air pressure variation in a horizontal pipe of a single-stack drainage system is very limited. Thus a physical model study was conducted to investigate the air pressure variation in a horizontal pipe. Four parameters were studied that affect the pressure variation; that is, water flow rate, inlet height, ventilation condition and outlet condition. When the top of the vertical drainage stack and the outlet were fully open to the atmosphere, the flow in the horizontal pipe changed from free surface flow to slug flow at certain times. The mean values and magnitudes of pressure fluctuation at measuring points on the horizontal pipe increased with Qw but decreased along the horizontal pipe. The inlet height had relatively small influence on the pressure variation. Three ventilation conditions; that is, top fully open, half open and sealed, were tested, and a choking flow was formed in the vertical drainage stack and the pressure in the horizontal pipe decreased under the top sealed condition. Three outlet conditions; that is, outlet fully open, half submerged and fully submerged, were tested. The...Continue Reading

References

Dec 17, 2011·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Y C WangL Vorreiter
Apr 27, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Biao HuangHarry E Schulz
Jun 1, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jiafang WeiJian Zhang
Jun 13, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Lin Li, David Z Zhu

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Citations

Feb 28, 2020·PloS One·Sarkhosh S Chaharborj, Norsarahaida Amin
Aug 17, 2021·Journal of Hazardous Materials·Qun WangKwok-Yung Yuen

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