Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Identification between Local Wall Thinning and Turbulent Velocity Components by Flow Acceleration Corrosion inside Tee of Pipe System

배관계 티에서 유동가속부식으로 인한 난류속도성분과 국부감육의 관계 규명

  • 김경훈 (경희대학교 기계공학과) ;
  • 이상규 (경희대학교 대학원 기계공학과) ;
  • 조연수 (경희대학교 대학원 기계공학과) ;
  • 황경모 (한국전력기술(주))
  • Received : 2011.04.15
  • Accepted : 2011.05.26
  • Published : 2011.07.10
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Abstract

When pipe components made of carbon steel in nuclear, fossil, and industry are exposed to flowing fluid, wall thinning caused by FAC(flow accelerated corrosion) can be generated and eventually ruptured at the portion of pressure boundary. A study to identify the locations generating local wall thinning and to disclose turbulence coefficient related to the local wall thinning was performed. Experiment and numerical analyses for tee of down scaled piping components were performed and the results were compared. In particular, flow visualization experiment which was used alkali metallic salt was performed to find actual location of local wall thinning inside tee components. To disclose the relationship between turbulence coefficients and local wall thinning, numerical analyses were performed for tee components. The turbulence coefficients based on the numerical analyses were compared with the local wall thinning based on the measured data. From the comparison of the results, the vertical flow velocity component(Vr) flowing to the wall after separating in the wall due to the geometrical configuration and colliding with the wall directly at an angle of some degree was analogous to the configuration of local wall thinning.

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References

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