In order to study acoustic emission (AE) signals characteristics of pressure vessel leakage, several cases of common in-service pressure vessel with leakage failure such as seal leakage, pitting corrosion perforation and safety valve leakage were tested by AE technology. Through statistical parameters of AE signals and waveform analysis on leakage process, the distribution characteristics of the AE hits, amplitude and frequency etc. were summarized on the different forms of leakage failure. The study will provide a reference for the device parameter configuration, sensor selection and estimation of the failure mode on in-service pressure vessel leakage.

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