Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Analysis on Signal Properties due to Concurrent Leaks at Two Points in Water Supply Pipelines

상수도 배관에서 두 지점의 동시 누수에 따른 신호특징 분석

  • Lee, Young-Sup (Department of Embedded Systems Engineering, Incheon National University)
  • 이영섭 (인천대학교 임베디드시스템공학과)
  • Received : 2015.01.18
  • Accepted : 2015.02.03
  • Published : 2015.02.28
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Abstract

Intelligent leak detection is an essential component of a underground water supply pipeline network such as a smart water grid system. In this network, numerous leak detection sensors are needed to cover all of the pipelines in a specific area installed at specific regular distances. It is also necessary to determine the existence of any leaks and estimate its location within a short time after it occurs. In this study, the leak signal properties and feasibility of leak location detection were investigated when concurrent leaks occurred at two points in a pipeline. The straight distance between the two leak sensors in the 100A sized cast-iron pipeline was 315.6 m, and their signals were measured with one leak and two concurrent leaks. Each leak location was described after analyzing the frequency properties and cross-correlation of the measured signals.

스마트 워터 그리드와 같은 지하매설 상수도 배관망을 구성할 때 누수 지점에 대한 지능적 탐지는 중요한 요소이다. 이런 지능형 배관망의 구성에는 많은 수의 누수탐지센서를 일정한 간격으로 설치하는 것이 필요하며 이들 센서에서 계측되는 신호를 분석해서 누수 유무 및 누수발생시 그 지점의 추정을 신속히 할 수 있어야 한다. 그래서 본 연구에서는 특히 두 지점에서 동시에 누수가 발생하는 경우에 대해 그 센서가 측정한 신호가 가지는 특성 및 두 누수지점 동시 추정 가능성을 심도있게 분석하였다. 즉, 센서간 거리가 315.6 m 인 100A 사이즈의 주철관 상수도 배관에 대해 두 지점 동시 누수시 각각의 개별 센서신호를 계측하였으며, 그 신호를 기반으로 주파수 특성 및 상호상관함수 등의 분석을 통해 두 지점의 누수탐지에 대해 기술하였다.

Keywords

Acknowledgement

Supported by : 국토교통부

References

  1. D. A. Liston and J. D. Liston, "Leak detection techniques," Journal of New England Water Works Association, 1206(2), pp. 103-108 (1992)
  2. O. Hunaidi and P. Giamou, "Ground-penetrating radar for detection of leaks in buried plastic water distribution pipes," 7th Int'l Conf. on Ground-Penetrating Radar, Kansas, USA, pp. 783-786 (1998)
  3. E. Shaw Cole, "Methods of leak detection: Overview," Journal of American Water Works Association, pp. 73-75 (1979)
  4. H. V. Fuchs and R. Riehle, "Ten years of experience with leak detection by acoustic signal analysis," Applied Acoustics, Vol. 33, pp. 1-19 (1991) https://doi.org/10.1016/0003-682X(91)90062-J
  5. O. Hunaidi and W. T. Chu, "Acoustical characteristics of leak signals in plastic water distribution pipes," Applied Acoustics, Vol. 58, pp. 235-254 (1999) https://doi.org/10.1016/S0003-682X(99)00013-4
  6. C. H. Knapp and G. C. Carter, "The generalized correlation method for the estimation of time-delay," IEEE Trans. Acoust., Speech, Signal Processing, 24(4), pp. 320-327 (1976) https://doi.org/10.1109/TASSP.1976.1162830
  7. Y.-S. Lee, D.-J. Yoon and J.-C. Jeong, "Leak location detection of underground water pipes using acoustic emission and acceleration signals," Journal of the Korean Society for Nondestructive Testing, Vol. 23, No. 3, pp. 89-98 (2003)
  8. Y.-S. Lee and D.-J. Yoon, "Improved estimation of leak location of pipelines using frequency band variation," Journal of the Korean Society for Nondestructive Testing, Vol. 34, No. 1, pp. 44-52 (2014) https://doi.org/10.7779/JKSNT.2014.34.1.44