Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Failure Behavior of T-joint Pipe with Outer Local Wall Thinning under Internal Pressure

내압을 받는 외부 국부 감육 T-joint 배관의 파손거동

  • Kim, Soo-Young (UR Interdisciplinary program of Mechanical Engineering, Pukyong Nat’l Univ.) ;
  • Nam, Ki-Woo (Materials Science and Engineering, Pukyong National University)
  • 김수영 (부경대학교(원) 학연협동기계공학과) ;
  • 남기우 (부경대학교 재료공학과)
  • Received : 2014.04.14
  • Accepted : 2014.08.22
  • Published : 2014.10.31
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Abstract

The pipelines are apt to erosion or corrosion because of the high-speed flow of water and steam with high temperatures or high pressures. This study was carried out a finite element analysis (FEA) and an experimental for the fracture behavior of T-joint pipes with local wall thinning under internal pressure. Local wall thinning was machined on the pipes in order to simulate erosion and corrosion of the metal. The configurations of the eroded area included an eroded ratio of d/t=0.80~0.963 and an eroded length of l=25 mm, 50 mm, and 102 mm. Three-dimensional elastic-plastic analyses were also carried out using FEA, which accurately simulates failure behaviors. In regards to the relationship between pressure and eroded, the criterion that indicates what can be used safely under operating pressure and design pressure were obtained from FEA. The FEA results were in relatively good agreement with that of the experiment.

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References

  1. V. K. Chexal, J. Horowitz, R. B. Dooley, P. Millett, C. Wood and R. Jones, 1998,"Flow-Accelerated Corrosion in Power Plant," EPRI/TR-106611-R2.
  2. R. B. Dooley and V. K. Chexal, 2000, "Flow-accelerated corrosion of pressure vessels in fossil plants", International Journal of Pressure Vessels and Piping, Vol. 77, pp. 85-90. https://doi.org/10.1016/S0308-0161(99)00087-3
  3. F. Michel, H. Reck and H. Schulz, 2001, "Experience with piping in German NPPs with Respect to Ageing-Related Aspects.," Nuclear Engineering and Design, Vol. 207, pp. 307-316. https://doi.org/10.1016/S0029-5493(01)00339-9
  4. K. W. Nam, S. H. Ahn and J. Y. Do, 2010, "Analysis of Weld Beads for Wall Thinning Defects in the Weld Zone of the Boost Pump Recirculation Pipe for Power Plants and Evaluation of Their Integrity" Journal of Ocean Engineering and Technology, Vol. 24, pp. 38-46.
  5. K. W. Nam, 2010, "Leak Before Break Behavior and Crack Opening Displacement on Piping under Bending Load", Transactions of the Korean Society of Mechanical Engineers A, Vol. 34, pp. 725-730. https://doi.org/10.3795/KSME-A.2010.34.6.725
  6. S. H. Ahn, K. W. Nam, Y. S. Yoo, K. Ando, S. H. Ji, K. Ishiwata and K. Hasegawa, 2002, "Fracture Behavior of Straight Pipe and Elbow with Local Wall Thinning," Nuclear Engineering and Design, Vol. 211, pp. 91-103. https://doi.org/10.1016/S0029-5493(01)00447-2
  7. M. Ono, K. W. Nam, K. Takahashi and K. Ando, 2004, "Effect of Local Wall Thinning on Fracture Behavior of Straight Pipe", The 15th European Conference of Fracture - Advanced Fracture Mechanics for Life and Safety Assessments, Stockholm, Sweden, August 11-13.
  8. S. H. Ahn, K. Ando, M. Ishiwata and K. Hasegawa, 1998, "Plastic collapse behavior of pipes with local wall thinning subjected to bending load and allowable limit", Journal of High Pressure Institute of Japan, Vol. 36, pp. 225-233.
  9. K. Miyazaki, S. Kanno, M. Ishiwata, K. Hasegawa, S. H. Ahn and K. Ando, 1999, "Fracture behavior of carbon steel pipe with local wall thinning subjected to bending load", Nuclear Engineering and Design, Vol. 191, pp. 195-204. https://doi.org/10.1016/S0029-5493(99)00141-7
  10. K. Miyazaki, A. Nebu, M. Ishiwata and K. Hasegawa, 2002, "Fracture strength and behavior of carbon steel pipes with local wall thinning subjected to cyclic bending load", Nuclear Engineering and Design, Vol. 214, pp. 127-136. https://doi.org/10.1016/S0029-5493(02)00021-3
  11. S. Y. Kim, J. W. Lee and K. W. Nam, 2014, "Failure Criterion of Straight Pipe with Outer Local Wall Thinning under Internal Pressure" Journal of the Korean Society for Power System Engineering, Vol. 18, pp. 76-83. https://doi.org/10.9726/kspse.2014.18.1.076