Analysis on Signal Properties due to Concurrent Leaks at Two Points in Water Supply Pipelines

Intelligent leak detection is an essential component of a underground water supply pipeline network suchas a smart water grid system. In this network, numerous leak detection sensors are needed to cover all of thepipelines in a specific area installed at specific regular distances. It is also necessary to determine the existence ofany leaks and estimate its location within a short time after it occurs. In this study, the leak signal properties andfeasibility 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 theirsignals were measured with one leak and two concurrent leaks. Each leak location was described after analyzingthe frequency properties and cross-correlation of the measured signals. Keywords: Concurrent Leaks at Two Points, Cross-Correlation, Signal Analysis, Time Arrival Difference, WaterLeak Detection[Received: January 18, 2015, Revised: January 27, 2015, Accepted: February 3, 2015] 인천대학교임베디드시스템공학과, Department of Embedded Systems Engineering, Incheon National University, Incheon 406-772, Korea (E-mail:YSL@incheon.ac.kr)