ASSESSMENT OF WALL-THINNING IN CARBON STEEL PIPE BY USING LASER-GENERATED GUIDED WAVE

In carbon steel pipes of nuclear power plants, local wall thinning may result from erosion-corrosion or flow-accelerated corrosion(FAC) damage. Local wall thinning is one of the major causes for the structural fracture of these pipes. Therefore, assessment of local wall thinning due to corrosion is an important issue in nondestructive evaluation for the integrity of nuclear power plants. In this study, laser-generated ultrasound technique was employed to evaluate local wall thinning due to corrosion. Guided waves were generated in the thermoelastic regime using a Q-switched pulsed Nd:YAG laser with a linear slit array. . In this paper, time-frequency analysis of ultrasonic waveforms using wavelet transform allowed the identification of generated guided wave modes by comparison with the theoretical dispersion curves. Modes conversion and group velocity were employed to detect thickness reduction.

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Effect of length of thinning area on the failure behavior of carbon steel pipe containing a defect of wall thinning

Nuclear Engineering and Design ◽

10.1016/s0029-5493(02)00386-2 ◽

2003 ◽

Vol 220 (3) ◽

pp. 274-284 ◽

Cited By ~ 21

Author(s):

Jin Weon Kim ◽

Chi Yong Park

Keyword(s):

Carbon Steel ◽

Steel Pipe ◽

Failure Behavior ◽

Wall Thinning

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Fracture behavior of carbon steel pipe with local wall thinning subjected to bending load

Nuclear Engineering and Design ◽

10.1016/s0029-5493(99)00141-7 ◽

1999 ◽

Vol 191 (2) ◽

pp. 195-204 ◽

Cited By ~ 66

Author(s):

Katsumasa Miyazaki ◽

Satoshi Kanno ◽

Masayuki Ishiwata ◽

Kunio Hasegawa ◽

Soek Hwan Ahn ◽

...

Keyword(s):

Carbon Steel ◽

Fracture Behavior ◽

Steel Pipe ◽

Wall Thinning ◽

Bending Load ◽

Local Wall Thinning

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An Eddy Current Method to Evaluate Local Wall Thinning of Carbon Steel Pipe

Studies in Applied Electromagnetics and Mechanics - Electromagnetic Non-Destructive Evaluation (XXIII) ◽

10.3233/saem200005 ◽

2020 ◽

Author(s):

Shanshan Sun ◽

Deqianga Zhou ◽

Noritaka Yusa ◽

Haicheng Song

Keyword(s):

Carbon Steel ◽

Correlation Analysis ◽

Eddy Current ◽

Gaussian Process Regression ◽

Current Method ◽

Steel Pipe ◽

Eddy Current Method ◽

Wall Thinning ◽

Simulation And Experiment ◽

Local Wall Thinning

This paper proposes to evaluate the local wall thinning of carbon steel pipe using an eddy current method. Firstly, the feature signals are determined by correlation analysis of the signals and the wall thinning sizes. Subsequently, the models for estimating the residual wall thickness rt is constructed using Gaussian process regression (GPR). Finally, the applicability of the models to the evaluation of local wall thinning is verified by simulation and experiment.

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