A case study of air pressure fluctuations in drainage stacks of high-rise residential buildings

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review


Pressure variation in drainage stack is one of the key design parameters for a healthy drainage system in high-rise residential buildings as it might deplete the water seals of any connected appliances that prevent the ingress of foul gases into a habitable space. In this study, diurnal pressure variations in a drainage stack of a typical in-use high-rise residential building in Hong Kong were investigated. With the survey data of occupant load variations and diurnal WC flushing patterns collected from a number of similar local buildings, a significant association between the expected hourly WC flushes in the building and the air pressure variations in the stack was reported. Mathematical expressions were proposed to correlate the occurrence of maximum air pressure at certain locations in a stack with the expected hourly WC flushes in high-rise residential buildings. The results would be a useful source of reference to the development of control strategies against probable appliance seal loss in high-rise residential buildings.
Original languageEnglish
Number of pages8
Publication statusPublished - 2006
EventCIB W062 Internatiofal Symposium of Water Supply and Drainage for Buildings (32nd : 2006) -
Duration: 1 Jan 2006 → …


ConferenceCIB W062 Internatiofal Symposium of Water Supply and Drainage for Buildings (32nd : 2006)
Period1/01/06 → …


  • Drainage stack
  • High-rise
  • Residential buildings
  • Air pressure variations

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