Study on New Methods of Improving the Accuracy of Leak Detection and Location of Natural Gas Pipeline

As negative pressure wave is applied to leak detection and location of natural gas pipeline, the key is how to realize accurate measurement of propagation velocity of pressure wave and time difference. However, there exists problem of lower accuracy in negative pressure wave method. Aiming at the problems of velocity measurement formula with low precision and low accuracy of leaking location, a modified velocity measurement formula is proposed. In addition, based on the theory of singularity detection of wavelet transform, the singular characteristic of the transform wave caused by pipeline leakage is detected accurately. The experimental results show that it can achieve leak detection and location of natural gas with higher accuracy through these methods.