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Acoustic Noise Characterization for Leak Detection in Water Mains

2017
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Release : 2017
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Book Synopsis Acoustic Noise Characterization for Leak Detection in Water Mains by : Abu Hena Muntakim

Download or read book Acoustic Noise Characterization for Leak Detection in Water Mains written by Abu Hena Muntakim. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic emission (AE) method is becoming popular for leak detection in municipal water mains where leaks are identified and the locations are determined through interpretation of measured acoustic signals without any excavation or disruption of services. For the interpretation of signals, several parameters such as frequency band of signals, coherence between signals, and cross-correlation between signals are employed. However, published literature lack data on applicability of the AE method under various field conditions. This research presents field investigation of leak detection using AE method, identification of leak noise source, leak noise attenuation characteristics and finite element (FE) simulation of acoustic wave propagation through fluid filled pipe. The field application of the AE method was performed through measuring acoustic noise at two points bracketing the leak along the pipe length in the City of Mount Pearl in Newfoundland and Labrador, Canada. For a better understanding of the source of leak noise, a preliminary laboratory investigation was conducted under a controlled environment. At low flow rates, it was found that water (escaping from the leak) hits surrounding obstacles and generates the leak noise. To explore the characteristics of leak noise, a new laboratory facility was developed and the attenuation characteristics of the leak noise was investigated. Leak noise attenuation was found to depend on the flow rate of the water. Finally, finite element (FE) method was used for modelling of acoustic wave propagation and attenuation characteristics. A commercially available FE software "ABAQUS" was used. FE analysis reveals that acoustic leak noise can propagate up to 150 m before attenuating to the ambient noise level in water mains.

Analysis of Acoustic Signals for Leak Detection in Water Distribution Networks

2023
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Release : 2023
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Book Synopsis Analysis of Acoustic Signals for Leak Detection in Water Distribution Networks by : Runal Shrivastava

Download or read book Analysis of Acoustic Signals for Leak Detection in Water Distribution Networks written by Runal Shrivastava. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic leak detection methods have proven effective in identifying leaks before they can cause interruptions in water supply and financial loss. However, most studies in this area have relied on laboratory experiments, and there is a need to expand the use of acoustic-based leak detection methods for real-time monitoring in the field. This study focuses on using hydrophones for leak detection in four different parts of a water network. The aim is to identify features that can differentiate between simulations of leaks and normal flow conditions and to assess the impact of network and leak characteristics on these features. Data was obtained from leaks simulated in the field, and the signals were analyzed using continuous wavelet transform and power spectral density. The results showed that acoustic signals from sites with cast iron pipes exhibit a higher power value in the frequency range of 200 to 400 Hz during most leak tests. Factors such as the distance of leaks from the sensors and network topology affect the magnitude of power for this frequency range, thus making detection more challenging. This frequency band can be used to establish a historical baseline and differentiate normal and abnormal conditions, thus, facilitating leak detection. The study concludes that acoustic-based leak detection methods have the potential to detect leaks in cast iron pipe networks. However, further research is necessary to tackle challenges present in real water distribution networks, including background noise, changes in pipe properties, and complicated network topology

Leak Detection Methods for Plastic Water Distribution Pipes

1999 Leak detectors
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Release : 1999
Genre : Leak detectors
Kind : eBook
Book Rating : 931/5 ( reviews)

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Book Synopsis Leak Detection Methods for Plastic Water Distribution Pipes by : Osama Hunaidi

Download or read book Leak Detection Methods for Plastic Water Distribution Pipes written by Osama Hunaidi. This book was released on 1999. Available in PDF, EPUB and Kindle. Book excerpt: Evaluates the effectiveness of pinpointing leaks in plastic pipe using acoustic leak detection equipment commonly used by the water industry in North America and promising technologies from other industries. Emphasizes technology and procedures for listening devices and an acoustic noise correlator. Research partner: National Research Council Canada.

Leak Detection

2013-06-30 Science
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Release : 2013-06-30
Genre : Science
Kind : eBook
Book Rating : 700/5 ( reviews)

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Book Synopsis Leak Detection by : Stuart Hamilton

Download or read book Leak Detection written by Stuart Hamilton. This book was released on 2013-06-30. Available in PDF, EPUB and Kindle. Book excerpt: Ageing infrastructure and declining water resources are major concerns with a growing global population. Controlling water loss has therefore become a priority for water utilities around the world. In order to improve efficiencies, water utilities need to apply good practices in leak detection. Leak Detection: Technology and Implementation assists water utilities with the development and implementation of leak detection programs. Leak detection and repair is one of the components of controlling water loss. In addition, techniques are discussed within this book and relevant case studies are presented. This book provides useful and practical information on leakage issues.

Leak Detection by Acoustic Emissions Monitoring

1994 Acoustic emission testing
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Release : 1994
Genre : Acoustic emission testing
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Book Synopsis Leak Detection by Acoustic Emissions Monitoring by : James F. Kirkpatrick

Download or read book Leak Detection by Acoustic Emissions Monitoring written by James F. Kirkpatrick. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt:

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