A new ultrasonic NDT method is proposed for detecting inner corrosion of pipes with circumferential vertical shear wave, SV wave, propagated within the pipe wall and longitudinal wave propagated in liquid for liquid-filled pipes. When SV wave excited at the outer surface of a pipe impinges the inner surface, a part of the wave energy leaks into the liquid. Longitudinal wave excited there propagates in liquid and reaches other points on the inner surface of the pipe. At there, longitudinal, Rayleigh and SV waves are excited and propagated again within/or along the pipe wall. With angle-beam SV wave transducer, we can detect delayed echoes caused by slow velocity in liquid. Using the simple ray theory, we estimated the propagation paths of the delayed echoes and confirmed them by experiments with a water-filled pipe of partial shielding on the inner surface. The results show that only limited propagation paths exist for given measurement configuration, i.e., geometry of a pipe, incident and receiving angles of the transducers, property of liquid in a pipe. Using this new method, we detected the degree of corrosion on the inner wall of pipes.
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ASME 2003 Pressure Vessels and Piping Conference
July 20–24, 2003
Cleveland, Ohio, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-1697-4
PROCEEDINGS PAPER
NDE of Pipe Inner Corrosion With Delayed Echoes of SV Wave Propagated Circumferentially in Liquid-Filled Pipes Available to Purchase
Hisashi Nagamizo,
Hisashi Nagamizo
Mitsubishi Chemical Corporation, Yokkaichi, Japan
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Koichiro Kawashima,
Koichiro Kawashima
Nagoya Institute of Technology, Nagoya, Japan
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Jyunji Miyauchi
Jyunji Miyauchi
Mitsubishi Chemical Corporation, Sakaide, Japan
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Hisashi Nagamizo
Mitsubishi Chemical Corporation, Yokkaichi, Japan
Koichiro Kawashima
Nagoya Institute of Technology, Nagoya, Japan
Jyunji Miyauchi
Mitsubishi Chemical Corporation, Sakaide, Japan
Paper No:
PVP2003-1846, pp. 7-12; 6 pages
Published Online:
August 13, 2008
Citation
Nagamizo, H, Kawashima, K, & Miyauchi, J. "NDE of Pipe Inner Corrosion With Delayed Echoes of SV Wave Propagated Circumferentially in Liquid-Filled Pipes." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. Ultrasonic Nondestructive Evaluation for Material Science and Industries. Cleveland, Ohio, USA. July 20–24, 2003. pp. 7-12. ASME. https://doi.org/10.1115/PVP2003-1846
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