The leak of gas pipelines can be detected and located by the acoustic method. The technologies of recognizing and extracting wave characteristics are summarized in details in this paper, which is to distinguish leaking and disturbing signals from time and frequency domain. A high-pressure and long distance leak test loop is designed and established by similarity analysis with field transmission pipelines. The acoustic signals collected by sensors are de-noised by wavelet transform to eliminate the background noises, and time-frequency analysis is used to analyze the characteristics of frequency domain. The conclusion can be drawn that most acoustic signals are concentrated on the ranges of 0-100 Hz. The acoustic signal recognition and extraction methods are verified and compared with others and it proves that the disturbing signals can be efficiently removed by the analysis of time and frequency domain, while the new characteristics of the accumulative value difference, mean value difference and peak value difference of signals in adjacent intervals can detect the leak effectively and decrease the false alarm rate significantly. The formula for leak location is modified with consideration of the influences of temperature and pressure. The positioning accuracy can be significantly improved with relative error between 0.01% and 1.37%.
Experimental study on leak detection and location for gas pipeline based on acoustic method
Journal of Loss Prevention in the Process Industries ; 25 , 1 ; 90-102
2012
13 Seiten, 24 Bilder, 6 Tabellen, 12 Quellen
Article (Journal)
English
Dispersion compensation in acoustic emission pipeline leak location
Tema Archive | 1997
|The pipeline leak location techniques based on modal acoustic emission
Tema Archive | 2004
|Experimental study of pipeline leak detection based on hoop strain measurement
Tema Archive | 2015
|Location and estimation of a pipeline leak
Tema Archive | 1990
|Study outlines pipeline leak-detection selection
Tema Archive | 2012
|