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Vol.4 No.4 previous AA-SP8(49-50-51-52-53-54-55-56-57-58)-NT 53 -54-55

Academic Articles
Regular Paper Vol.5No.1 (2013) p.25 - p.33
 

Implementation of electromagnetic acoustic resonance in pipe inspection

 
Ryoichi URAYAMA1 Toshiyuki TAKAGI1,*, Tetsuya UCHIMOTO1, Shigeru KANEMOTO2, Taku OHIRA3 and Takayoshi KIKUCHI3
 
1 Institute of Fluid Science, Tohoku University, 2-1-1Katahira, Aoba-ku, Sendai 980-8577, Japan
2 School of Computer Science and Engineering, The University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu, Fukushima, 965-0826, Japan
3 Plant Management Department, The Japan Atomic Power Company, 1-1, Kanda-Mitoshiro-cho, Chiyoda-ku, Tokyo 101-0053, Japan
 
Abstract
Electromagnetic acoustic resonance (EMAR) provides accurate and stable evaluation. Its capability has been demonstrated through online monitoring using a large-scale corrosion test loop operating at high temperature. This study uses EMAR to evaluate the thickness of pipes in a nuclear power plant during its shutdown through signal processing based on superposition of nth compression. Sections of piping evaluated with EMAR include those in long-term service, where thinning may produce scale-like surfaces, and those having complicated geometry. Moreover, we compare measurement results obtained with EMAR and with ultrasonic testing (UT). The accuracy of EMAR depends on the pipe geometry, such as the pipe diameter and whether the pipe is straight or an elbow, the presence of welding, and complicated wall thinning. We consider the causes of the difference in thickness values between EMAR measurements and UT. Finally, we discuss how to implement EMAR in pipe inspection.
 
Keywords
nondestructive testing, electromagnetic acoustic resonance, pipe wall thinning, thickness measurement, signal processing.
 
Full Paper: PDF EJAM Vol.5No.1 pp.25-33 "Implementation of electromagnetic acoustic resonance in pipe inspection"

















Article Information
Article history:
Received 12 November 2012
Accepted 13 February 2013