In this paper

an algorithm for gas pipeline leak detection based on Hilbert-Huang transform is studied.The characteristics of the leaked acoustic signal in frequency domain can be analyzed by computing and comparing the before-and-after fluctuations of the energy of Hilbert marginal spectrum.The method judges whether the leak occurs or not by comparing the Hilbert spectrums of current signal with normal signal in the sensitive frequency band

and then locates leak according to the time difference of the leak acoustics arriving in the upstream and downstream ends.Off-line tests based on real history data of industrial pipeline proved the validity of the method.