Design of a Novel In-Pipe Reliable Leak Detector

Chatzigeorgiou, Dimitrios; Youcef‐Toumi, Kamal; Ben‐Mansour, Rached

doi:10.1109/tmech.2014.2308145

Cited by 64 publications

(27 citation statements)

References 18 publications

(18 reference statements)

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“…However, a pressure change caused by leakage is too small to be detected, even in a steady flow. Additionally, in cases of low water pressure, it is difficult to detect leaks by capturing the force caused by the pressure change (Chatzigeorgiou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Transient damping method for narrowing down leak location in pressurized pipelines

Asada

Kimura

Azechi

et al. 2020

Hydrological Research Letters

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Numerous leak detection methods have been developed for pipeline systems because of the shortage of water resources, increased water demand, and leak accidents. These methods have their advantages and disadvantages in terms of cost, labor, and accuracy; therefore, it is important to narrow down the location of a leak as easily, rapidly, and accurately as possible. This study applies the technologies based on the execution of a transient event (transient testbased technologies (TTBTs)), and a model is presented for representing the relation between the leak location and the damping of the pressure transient due to the leakage. The model is verified with laboratory experiments in which the leak location can be narrowed down to be less than 10% to 30% of the total pipe length. The model is found to be more effective if the leak location is nearer to the upstream end. In addition, the leak location found by the damping model varies with an approximate absolute error of 2% to 5% of the pipe length. It is suggested that the damping model is suitable for narrowing down and not for finding the leak location, and should be used in combination with other leak detection methods. KEYWORDS detection of water leakage; pipeline; water hammer; damping of pressure transient; narrowing down of leak location; stock management of infrastructure

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Section: Introductionmentioning

confidence: 99%

Transient damping method for narrowing down leak location in pressurized pipelines

Asada

Kimura

Azechi

et al. 2020

Hydrological Research Letters

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“…However, in both cases, it is hard to interpret underwater measured acoustic signal events due to variations of the surroundings parameters, signal similarities, and the stochastic nature of events [9,22]. Particularly in the case of small leaks, signal features completely hide under the impact of factors as mentioned above, and the leak size effect could not become apparent.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly in the case of small leaks, signal features completely hide under the impact of factors as mentioned above, and the leak size effect could not become apparent. A number of similar, free-swimming technologies and studies exists [22][23][24][25], but no study has focused on the investigation of underwater events. The free-swimming acoustic device with events analysis capability can be a very reliable and robust underwater acoustic leak detection technology which is a key focus of this research.…”

Section: Introductionmentioning

confidence: 99%

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

Kumar

Zhu

et al. 2017

Water

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Abstract:The conventional fixed acoustic sensors leak detection methods have been demonstrated to be very practical for locating leakages in water distribution pipelines. However, these methods demand proper installation of sensors, and therefore cannot be implemented on buried long water distribution pipelines for condition assessment, early leak detection, and the estimation of leak size effect. Due to these limitations, a free-swimming device is developed. The free-swimming device with the potential of high acoustic sensitivity is capable of detecting the small underwater leakages in the plastic water-filled pipes. Despite the fact that a number of factors influence the underwater acoustic signals, such as water flow noise. Therefore, the interpretation of the leakage and influence of leakage size is considerably challenging from the underwater measured signals. The new method is proposed for reliable leakage detection by tuning the wavelet transform to underwater water acoustic signals. In this method, firstly, Short-Time Fourier Transforms (STFT) of underwater acoustic signals over a relatively long time-interval is monitored to capture the leakage-signals signature. The captured signals efficiently lead in the selection of mother wavelet (tuned wavelet) for the excellent signal localization in the time-frequency domain. Finally, the acoustic signals are analyzed in the tuned wavelet transform to detect the events. In this paper, the practical application of the proposed method, the controlled experiments are designed, and acoustic signals are collected from an experimental setup by launching the free-swimming device. The measured acoustic signals are used to identify the leakage-signals signature from unwanted interfering signals (instantaneous pipe vibrations, water flow noise, pipe's natural frequencies, and background noise). The evaluation of results validated that the free-swimming device and the tuned wavelet transform together can efficiently lead to reliable underwater leakage detection, as well as the influence of the leakage size in plastic water-filled pipes.

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“…A complete list of robots for the inspection of water pipes is provided in [7]. Finally, our group recently proposed a new complete system for the inspection of pipelines with the help of a novel sensing system based on a pressure gradient [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and parameter estimation for in-pipe swimming robots

Wu¹,

Chatzigeorgiou²,

Zribi

2015

2015 American Control Conference (ACC)

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State-of-the-art, in-pipe, crawling robots face challenges in small diameter, non-smooth, water distribution pipes, mostly because of their direct contact with the pipe walls. On the other hand, swimming robots show greater potential in performing various maneuvers inside the pipes, because of the freedom in their motion. Such autonomous, swimming robots are needed for pipe-monitoring and leak detection in all sorts of pipe networks. Swimming motion inside confined environments is not well studied, and thus, this paper tackles the problem of modeling an in-pipe swimming vehicle. A conventional methodology that involved hydrodynamic coefficients is adopted, however the confined environment is affecting the parameters under study heavily. We discuss how these parameters rely on the pipe and robot geometry, unlike the case where the robot would swim in open-water.

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Design of a Novel In-Pipe Reliable Leak Detector

Cited by 64 publications

References 18 publications

Transient damping method for narrowing down leak location in pressurized pipelines

Transient damping method for narrowing down leak location in pressurized pipelines

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

Modeling and parameter estimation for in-pipe swimming robots

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