Abstract
Lined anti-corrosion pipes are widely used in oil and gas, petrochemical, pharmaceutical industries. However, defects, especially delamination, may occur in the production and service of pipes which result in safety accidents. Based on nonlinear ultrasonic theory, this paper studied the delamination detection method using the nonlinear harmonics for lined anti-corrosion pipes. The response characteristics of the anti-corrosion pipe were obtained through a sweep sine response experiment and the preferred excitation frequency was determined. The Wavelet Packet transform and Hilbert–Huang transform is applied for signal process and feature extraction. Then, a series of experiments were carried out and the results were analyzed and discussed. The results showed that a second-order and third-order nonlinear coefficient increased with the delamination damage. The amplitude of second-harmonic is much stronger than the third-order one. The mean squared error of the nonlinear coefficient, which was processed by Wavelet Packet transform and Hilbert–Huang transform, is smaller than wavelet packet transform and Discrete Fourier transform or processed only Hilbert–Huang transform. The higher harmonics can describe the change of delamination damage, which means that the nonlinear ultrasonic detection method could use for damage detection of anti-corrosion pipe. The nonlinear higher-harmonic is sensitive to delamination damage. The nonlinear ultrasonic method has the potential for damage detection for lined anti-corrosion pipes.
Highlights
The pipeline is one of the most important transportation means in oil and gas, petrochemical, and pharmaceutical industries [1,2,3,4]
Step 7: A comparison of the processing process with or without Wavelet Packet Transform (WPT) and HHT was performed to verify the effectiveness of the method
The amplitude of the third-order harmonic that was processed by WPT+Discrete Fourier transform (DFT) has a growing trend with the increase of delamination damage
Summary
The pipeline is one of the most important transportation means in oil and gas, petrochemical, and pharmaceutical industries [1,2,3,4]. Luo et al [39] assessed the interfacial strength of concrete time reversal technique to evaluate loosened bolted joints based on the actuation and sensing filled fiber reinforced polymer tube using PZT transducers. Xu et al [48] developed a PZT enabled active sensing method to detect the steel and investigated the detection of debonding between fiber reinforced polymer bar and concrete structure concrete debonding in Concrete Filled Steel Tubes (CFST). PZTs are debonding between fiber reinforced polymer bar and concrete structure using piezoceramic transducers actively studied to detect the interlayer delamination [50,51,52]. PZTs are actively studied to detect the transducer to excite and to sense the ultrasonic wave in the paper.
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