Characteristics of air transient pressure at drainage stacks : a statistical modelling study

Ling Tim Wong, Kwok Wai Mui, C.L. Cheng, C.J. Yen, K.C. He

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review


The maximum transient air pressure at a discharging drainage stacks is an important design parameter for the drainage system in high-rise buildings. As the pressure fluctuated, measurements of the inside of the drainage stacks at coarse sampling intervals would defeat the data quality; however, ultra fine sampling frequency would not be practically cost justified. This study examines the air pressure variations characteristics in a discharging drainage stack of a full-scale drainage experiment tower at steady flow rates. The pressure was described in terms of the fluctuation frequency, the maximum pressure, and the average pressure with its standard deviation. Correlations between physical parameters were investigated. In particular, mathematical expressions were proposed to correlate the maximum transient air pressure with the probability density function of the measured pressure. Good correlations with the measured results were reported. This study enhanced the understanding of transient air pressure characteristics at a discharging drainage stack and the result would be useful for air pressure measurements at drainage stacks of high-rise buildings.
Original languageEnglish
Number of pages11
Publication statusPublished - 2008
EventCIB W062 International Symposium of Water Supply and Drainage for Buildings -
Duration: 1 Jan 2008 → …


ConferenceCIB W062 International Symposium of Water Supply and Drainage for Buildings
Period1/01/08 → …


  • Drainage stack
  • transient air pressure characteristics
  • full-scale experiments
  • high-rise.

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