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A platform for research: civil engineering, architecture and urbanism
Detecting & locating leaks in water distribution polyethylene pipes
This paper focuses on the problem of detecting and locating the position of water leaks in water distribution Medium Density Polyethylene (MDPE) pipes using passive acoustic detection methods. A leaking water pipe generates noise which depends primarily on water pressure, pipe characteristics and the leak size and shape. This leak noise comprises vibration and acoustic signals, which can be detected using non-invasive accelerometers and invasive hydrophone sensors respectively. In current practise, a correlation technique is typically employed to detect, position and characterise these water leaks using the leak noise produced. This is proved to be very efficient for metallic pipes; however, the same is not true for plastic MDPE pipes where the attenuation rate with distance of the leak/source signal is very high, and the generated leak signals are of low frequency and narrow bandwidth. In order to locate leak with good accuracy in MDPE pipes, correlation process relies on estimation of the speed of sound in water/pipe and the time delay between leak signals measured at two locations across the pipes. The speed of sound can be calculated with good accuracy. However, the estimation of time delay depends upon the type, positioning of sensor and the processing of signals obtained; which is very difficult to do for MDPE pipes. Therefore in this paper, MDPE pipes are experimentally evaluated and it has been found that most of the leak signals for tested MDPE pipes lie in the frequency band of 20Hz to 250Hz, with the upper frequency limit changes with flow rate and leak characteristics. With these results, it is possible to achieve better performance of existing correlators by means of using appropriate filters and amplification.
Detecting & locating leaks in water distribution polyethylene pipes
This paper focuses on the problem of detecting and locating the position of water leaks in water distribution Medium Density Polyethylene (MDPE) pipes using passive acoustic detection methods. A leaking water pipe generates noise which depends primarily on water pressure, pipe characteristics and the leak size and shape. This leak noise comprises vibration and acoustic signals, which can be detected using non-invasive accelerometers and invasive hydrophone sensors respectively. In current practise, a correlation technique is typically employed to detect, position and characterise these water leaks using the leak noise produced. This is proved to be very efficient for metallic pipes; however, the same is not true for plastic MDPE pipes where the attenuation rate with distance of the leak/source signal is very high, and the generated leak signals are of low frequency and narrow bandwidth. In order to locate leak with good accuracy in MDPE pipes, correlation process relies on estimation of the speed of sound in water/pipe and the time delay between leak signals measured at two locations across the pipes. The speed of sound can be calculated with good accuracy. However, the estimation of time delay depends upon the type, positioning of sensor and the processing of signals obtained; which is very difficult to do for MDPE pipes. Therefore in this paper, MDPE pipes are experimentally evaluated and it has been found that most of the leak signals for tested MDPE pipes lie in the frequency band of 20Hz to 250Hz, with the upper frequency limit changes with flow rate and leak characteristics. With these results, it is possible to achieve better performance of existing correlators by means of using appropriate filters and amplification.
Detecting & locating leaks in water distribution polyethylene pipes
Pal, Maninder (author) / Dixon, Neil (author) / Flint, James (author)
2010
6 Seiten, 8 Bilder, 1 Tabelle, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
Polyethylen , Rohr , Leck , Ortung , Kreuzkorrelation , Fourier-Transformation , Versuchsaufbau , experimentelle Untersuchung , Prüfverfahren , Versuchsergebnis , Frequenzbereich , Durchflussmenge , Phase (Schwingung) , Wasserdruck , Schwingung , akustisches Signal , Beschleunigungsmesser , Hydrophon , Sensor , Schallgeschwindigkeitsmessung , Frequenzgang
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