Study on In-Pipe Corrosion Diagnosis System -Estimation of Corrosion on Screw Parts Using a Surface SH Probe-
Shintaro Sakamoto*, Toshio Fukuda**, Hironori Yui**,
Yasuhiro Abe*****, Yasuhisa Hasegawa***,
Futoshi Kobayashi****, and Fumihito Arai**
*Research and Development Center, Shinryo Corporation, 41 Wadai, Tsukuba, Ibaraki 300-4247, Japan
**Department of Micro System Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya-shi, Aichi 464-8603, Japan
***Department of Mechanical Systems Engineering, Faculty of Engineering, Gifu University, 1-1, Yanagido, Gifu 501-1193, Japan
****Department of Machine and System Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan
*****ForU Corporation Limited, 23/F., The Toy House100 Canton Road, Tsimshatsui, Kowloon, Hong Kong
Correlating to changes in society’s expectations, there is an increasing demand for the diagnosis of building equipment. Examination and diagnosis of air-conditioning pipes is an important safeguard against unexpected trouble such as pipe leakage. It is particularly important to inspect the screwed parts of pipes because their thickness is thinner than other parts due to the thread. In the past, radiography and endoscopy have been used for the inspection of screwed parts, but radiographic testing must be performed by a licensed technician, and endoscopy requires halting of plant operations. In this paper, we introduce a method for detecting and estimating the size and position of corrosion using ultrasonic testing, surface SH waves. We describe the algorithms used to estimate the corrosion size using the edge echo height, and the corrosion position using a simple numerical echo height model. And finally, we show the results of using the algorithms in experiments on pipes with artificial corrosion.
-  M. Ohno, “Ability of the latest facility diagnosis. Piping inspection using an ultrasonic wave, by robot,” Plant Engineer, pp.23-27, 1995.
-  Y. Kurosaki et al., “Automatic inspection system for piping corrosion,” Proceedings of The 1st Symposium on Construction Robotics in Japan, pp.379-384, 1990.
-  N. Mukai et al., “Automatic Inspection System for Piping Corrosion (Part 1. R&D Concept and System Outline,” Technical Papers of Annual Meeting of The Society of Heating, Air-Conditioning and Sanitary Engineering of Japan, pp.933-936, 1989.
-  S. Sakamoto et al., “Development of a Robot Manipulator for Pipe Flow Detection Using Ultrasonic Wave Echo,” Trans. of the Japan Society of Mechanical Engineers (C), 69-688, pp.3316-3321, 2003.
-  S. Iwashita, S. Sakamoto et al., “Control of Parallel-Link Robot Manipulator for Pipe-Flaw Diagnosis,” Trans. of the Japan Society of Mechanical Engineers (C), 69-688, pp.3309-3315, 2003.
-  T. Fukuda, S. Sakamoto et al., “In-Pipe Corrosion Diagnosis System (Estimation of the Type and Size of Corrosion Using Two-Dimensional Ultrasonic Flaw Detector),” Trans. of the Japan Society of Mechanical Engineers (C), 68-666, pp.391-397, 2002.
-  K. Onda et al., “Development of Automatic Ultrasonic Testing System for Steam Turbine High Temperature Bolt,” Report of CHUBU Electric Power Co., No.85, pp.122-133, 1991.
-  G. M. Light and two others, “Stud bolt inspection using ultrasonic cylindrically guided wave technique,” ASME, Vol.26, pp.31-38, 1986.
-  Dong-Man Suh et al., “Ultrasonic Inspection of Studs (Bolts) Using Dynamic Predictive Deconvolution and Wave Shaping,” IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 46, No.2, 1999.
-  Y. Ikegaya, “Recent Ultrasonic Probe II SH Wave Probe and its Application,” Non-Destructive Inspection, Vol.52, No.1, pp.3-8, 2003.
-  Y. Yanaginuma et al., “Ultrasonic Measurements of Root Gap in Fillet Welded Cruciform Joints by Surface Horizontally Polarized Shear Wave,” Non-Destructive Inspection, Vol.51, No.11, pp. 733-739, 2002.
-  M. Takahashi, et al., “Experimental Study of Echo Directivity for Surface SH Wave and SH Wave Angle Probes,” 7th European Conference on Non-Destructive Testing, pp.26-29, 1998.
-  The Japanese Society for Non-Destructive Inspection, “Handbook of Non-Destructive Inspection,” pp.231, 1992.
-  M. Kasahara et al., “Study on Ultrasonic Testing Techniques Using Grazing SH-Wave,” Proceedings of the 3rd Symposium on Ultrasonic Nondestructive Characterization, pp.129-135, 1996.
-  M. Takahashi et al., “Experimental Study of Echo Transmittance of SH Wave,” Non-Destructive Inspection, Vol.45, No.5, pp.343-348, 1996.
-  M. Takahashi et al., “Experimental Study of Echo Directivity for Surface SH Wave and SH Wave Angle Probes,” Non-Destructive Inspection, Vol.45, No.9, pp.688-696, 1996.
This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.
Copyright© 2004 by Fuji Technology Press Ltd. and Japan Society of Mechanical Engineers. All right reserved.