Automatic detection of depleted fixture trap seals using the reflected wave technique

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    The loss of fixture trap seals presents a potential cross-contamination
    route for sewer borne pathogens. The defective trap identification method
    was developed to assess the status of trap seals using a non-destructive
    “sonar-like” test based on the reflected wave technique. System diagnosis,
    proven over several years of laboratory and sited-based validation,
    primarily depended on manual interpretation of system pressure responses
    to identify the trap location from the reflected wave return time. This paper
    advances the technique by introducing the developed “TRACER” program
    which includes a time series change detection algorithm allowing automatic
    system diagnosis. Outputs were validated against simulations using the
    AIRNET numerical model which, together with the “PROBE” Method, was
    used to determine trap pipe periods, and therefore the location of defective
    trap seals, with improved accuracy over those calculated theoretically. This
    technique thus provides a reliable and automated approach to monitoring
    the protective seal between habitable space and the sewer network.
    Original languageEnglish
    Pages (from-to)254-267
    Number of pages14
    JournalBuilding Services Engineering Research and Technology
    Issue number3
    Early online date13 Jun 2013
    Publication statusPublished - May 2014


    • Building drainage system
    • cross-contamination
    • pressure transient reflection


    Dive into the research topics of 'Automatic detection of depleted fixture trap seals using the reflected wave technique'. Together they form a unique fingerprint.

    Cite this