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On-Line Monitoring of Pipe Wall Thinning by a High Temperature Ultrasonic Waveguide System at the Flow Accelerated Corrosion Proof Facility

1
Nuclear Materials Research Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea
2
Department of Materials Science and Engineering, Dankook University, 119, Dandae-ro, Dongnam-gu, Cheonan 31116, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(8), 1762; https://doi.org/10.3390/s19081762
Received: 10 March 2019 / Revised: 28 March 2019 / Accepted: 8 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Advanced Sensors for Real-Time Monitoring Applications)
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Abstract

Pipe wall thinning and leakage due to flow accelerated corrosion (FAC) are important safety concerns for nuclear power plants. A shear horizontal ultrasonic pitch/catch technique was developed for the accurate monitoring of the pipe wall-thickness. A solid couplant should be used to ensure high quality ultrasonic signals for a long operation time at an elevated temperature. We developed a high temperature ultrasonic thickness monitoring method using a pair of shear horizontal transducers and waveguide strips. A computer program for on-line monitoring of the pipe thickness at high temperature was also developed. Both a conventional buffer rod pulse-echo type and a developed shear horizontal ultrasonic waveguide type for a high temperature thickness monitoring system were successfully installed to test a section of the FAC proof test facility. The overall measurement error was estimated as ±15 μm during a cycle ranging from room temperature to 150 °C. The developed waveguide system was stable for about 3300 h and sensitive to changes in the internal flow velocity. This system can be used for high temperature thickness monitoring in all industries as well as nuclear power plants. View Full-Text
Keywords: high temperature pipe; pipe wall thinning; flow accelerated corrosion high temperature pipe; pipe wall thinning; flow accelerated corrosion
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Oh, S.-B.; Cheong, Y.-M.; Kim, D.-J.; Kim, K.-M. On-Line Monitoring of Pipe Wall Thinning by a High Temperature Ultrasonic Waveguide System at the Flow Accelerated Corrosion Proof Facility. Sensors 2019, 19, 1762.

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