Technology of Inspection and Real-time Displacement Monitoring on Critical Pipe for Power Plant

발전용 고온 배관의 점검 및 실시간 변위감시 기술

  • Published : 2009.10.01


High temperature steam pipes of thermal power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue damages. Also, poor or malfunctional supports can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical piping system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder sensors, this system was installed and operated on the high temperature steam piping of "Y" thermal power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.


  1. Hyun, J. S., Baek, S. G., Song, G. W., 1998, 'Low Cycle Creep-Fatigue Life Prediction of 1Cr-0.5Mo Pipe Steel with Hold Time Effects by Using the Plastic Strain Energy,' KSME A, Vol. 22, No. 12, pp. 2093-2099
  2. James, P. K., 1998, 'Current Experience in Typical Problems and Failures with Boiler Piping Components and Supports,' PVP-Vol. Component Analysis and Evaluation, Aging and Maintenance, and Pipe Supports, ASME, pp. 161-168
  3. Kwon, K. H., Moon, H. K., Cho, N. G., 2002, 'A Measuring Method for 3-DOF Displacement by Using Spherical Reflector,' KSME A, Vol. 26, No. 12, pp. 2687-2694
  4. Nam, T. S., Choi, J. H., Kang, B. H., 2002, 'Vibration Exciter Design for Flow Resonance with a Displacement Estimater Using Strain Gauge,' KSME A, Vol. 26, No. 9, pp. 1874-1881
  5. Oh, K. H., Joo, J. W., 2004, 'Sunmicrodisplacement Measuring System with Moire Interferometer and Application to the Thermal Deformation of PBGA Package,' KSME A, Vol. 28, No. 11, pp. 1646-1655
  6. Kim, Y. J., 2000, 'Development of On-line Diagnosis System and Maintenance Technology for Power Plant,' Ministry of Science and Technology(Korea), 99-NE-05-07-A, pp. 307-315
  7. Flaman, M. T., Mills, B. E., 1992, 'Development of a Strain Gauge Based On-line Structural Integrity Monitoring System for Fossil-Fuelled G.S,' CEA Project No. 726 G 627, Ontario Hydro Research Division, USA
  8. Fournier, T., 1993, 'On-line Fatigue Monitoring and Matgins Probablistic Assessment', SMIRT-12K. Kussmaul, North-Holland, pp. 271-276
  9. Han, B., Weber, B. J., Nerger, T., 2002, 'In-service Condition Monitoring of Piping Systems in Power Plants Requirements and Advanced Techniques,' OMMI(in Germany), Vol. 1, Issue 1, pp.1-13
  10. ASME, 2004, 'Power Piping,' ASME Code for Pressure Piping, B31, pp.9-15
  11. Hyun, J. S., Song, G. W., Cho, S. Y., Lee, Y. S., 2005, 'Real-Time Displacement Monitoring System for High Temperature Steam Pipe of Fossil Power Plant,' Key Engineering Materials, Vol. 297-300, pp. 2164-2168