Figure 1: Details of the Active Control building drainage system installed at the O2 Dome
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exacerbated by dry traps in many bathrooms, failures due to a combination of poor maintenance and bathroom extraction fan usage. In 2005, HWU proposed a non-invasive remote
and non-destructive methodology to identify depleted trap seals by drawing upon pressure surge theory, and in particular, the result that an open or closed branch termination will generate differing responses to an incoming transient. (See Figure 2). With UK Engineering and Physical Sciences Research Council (EPSRC) funding, and with additional funding and project team membership from Studor, IAPMO SNIPEF, Buro Happold, RBS and the UK Department of Health, a practical system was developed and tested in large buildings in Dundee, Edinburgh and Glasgow, including an RBS building in Glasgow and the Edinburgh Royal Infirmary building. The research team could not control the activity within the building, so it was a very good test of the system. The equipment consisted of a sinusoidal pressure wave
generator and diversion valves fitted to the upper dry levels of a system stack and pressure sensors (see Figure 3). The comparison of a no-fault system response to a 10
Baxi_LZC_CIBSE Journal_HalfDPS_JUNE 7/5/10 18:10 Page 1
Hz sinusoidal pressure excitation, with a duration of less than two seconds and a response where one or more traps are depleted, indicates the location of any depleted trap as the pressure signal travels at the acoustic velocity in air. Further development beyond the EPSRC research
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