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JWJ > Volume 30(6); 2012 > Article
Journal of KWJS 2012 December;30(6) :36-41.
Published online December 23, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.6.36
A Technique for Defect Detection of Condenser Tube in Support Plate Region using Guided Wave
Yong-Kwon Kim*, Ik-Keun Park*, Sae-Jun Park**, Yeon-Shik Ahn***, Doo-Song Gil***
*Dept. of Mechanical and Automotive Engineering, Seoul National Univ. of Science & Technology, seoul 139-743, Korea
**Non-Destructive Examination Dept., Doosan Heavy Industries & Construction, Changwon 641-792, Korea
***KEPCO Research Institute, Daejeon 305-760, Korea
Correspondence: Ik-Keun Park  Email: ikpark@snut.ac.kr
  Published online December 23, 2012
ABSTRACT
General condensers consist of many tubes supported by tube sheets and support plates to prevent the deflection of the condenser tubes. When a fluid at high pressure and temperature runs over the tubes for the purpose of transferring heat from one medium to another, the tubes vibrate and their surface comes into contact with the support plates. This vibration causes damage to the tubes, such as cracks and wear. We propose an ultrasonic guided wave technique to detect the above problems in the support plate region. In the proposed method, the ultrasonic guided wave mode, L(0,1), is excited using an internal transducer probe from a single position at the end of the tube. In this paper, we present a preliminary experimental verification using a super stainless tube and show that the defects can be discriminated from the support signals in the support region.
Keywords: Ultrasonic guided-wave | Condenser tube | Support plate region | Internal transducer probe
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