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High-temperature ultrasonic thickness monitoring for pipe thinning in a flow-accelerated corrosion proof test facility

  • Cheong, Yong-Moo (Division of Nuclear Materials Research, Korea Atomic Energy Research Institute) ;
  • Kim, Kyung-Mo (Division of Nuclear Materials Research, Korea Atomic Energy Research Institute) ;
  • Kim, Dong-Jin (Division of Nuclear Materials Research, Korea Atomic Energy Research Institute)
  • Received : 2016.08.03
  • Accepted : 2017.05.17
  • Published : 2017.10.25

Abstract

In order to monitor the pipe thinning caused by flow-accelerated corrosion (FAC) that occurs in coolant piping systems, a shear horizontal ultrasonic pitch-catch waveguide technique was developed for accurate pipe wall thickness monitoring. A clamping device for dry coupling contact between the end of the waveguide and pipe surface was designed and fabricated. A computer program for multi-channel on-line monitoring of the pipe thickness at high temperature was also developed. Both a four-channel buffer rod pulse-echo type and a shear horizontal ultrasonic waveguide type for high-temperature thickness monitoring system were successfully installed to the test section of the FAC proof test facility. The overall measurement error can be estimated as ${\pm}10{\mu}m$ during a cycle from room temperature to $200^{\circ}C$.

Acknowledgement

Supported by : Korea Atomic Energy Research Institute

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