Long Distance Large Diameter Heating Pipeline Leakage Detection Based on Acoustic Pressure Sensor

In this paper, an innovative leakage detection method based on acoustic pressure sensor for long distance and large diameter heating pipeline is proposed. Firstly, this paper designs a data acquisition equipment, implements the leakage signal detection with the data acquisition equipment and PCB acoustic pressure sensor at the real heating pipeline. The leakage characteristics of dynamic acoustic pressure signal for long distance and large diameter heating pipeline are studied, and the de-noising abilities of db wavelet, sym wavelet and haar wavelet for acoustic pressure signal in the pipeline are compared. Though db wavelet and sym wavelet could effectively filter the noise signal in processing leakage signal from the small-scale pipe in laboratory, they could not filter the noise signal from long distance and large diameter heating pipeline. Comparison results of the three wavelets show that haar wavelet is the best one for signal filtering in long distance and large diameter heating pipeline. Therefore, acoustic method is appropriate for leakage detection of long distance and large diameter heating pipeline. This paper provides an effective method for leakage detection of long distance and large diameter heating pipeline, which will obtain better economic benefits in industrial production simulator can be computed. Test result shows that the test system possesses such good performances as convenient operation and perfect alignment.