Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Failure Analysis of an Inlet Pipe of a Governor Valve in a Steam Turbine of a District Heating System

지역난방 증기 터빈 내 조속기 밸브 Inlet pipe 파손 원인 분석

  • Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Woo Cheol (R&D Institute, Korea District Heating Corp) ;
  • Kim, Heesan (Department of Materials Science and Engineering, Hongik University) ;
  • Kim, Jung-Gu (School of Advanced Materials and Engineering, Sungkyunkwan University) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • 채호병 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사미래개발) ;
  • 김희산 (홍익대학교 재료공학과) ;
  • 김정구 (성균관대학교신소재공학부) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2021.12.16
  • Accepted : 2022.01.22
  • Published : 2022.02.28
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Abstract

The objective of this study was to perform failure analysis of an inlet pipe located in a governor valve of a steam turbine in a district heating system. During the operation, the temperature of the governor valve was increased to as high as ~500 ℃, which induced thermal expansion of the inlet pipe along both axial and radial directions. While the inlet pipe did not have contact with the valve seat, the side plane of the upside was constrained by the casing part, which led the inlet pipe to experience stress field in the form of fatigue and creep. The primary crack was initiated at about 30 mm below the top where the complex stress field was anticipated. These results suggest that the main failure mechanism is a combination of thermal fatigue and creep during the operation supported by the observation of apparent beach marks on the fracture surface and pores near the cracks, respectively.

Keywords

Acknowledgement

본 연구는 한국지역난방공사의 지원을 받아 진행되었습니다.

References

  1. M. Hong, H. Chae, W. C. Kim, J.-G. Kim, H. Kim, and S. Y. Lee, Failure Analysis of a Water Wall Boiler Tube for Power Generation in a District Heating System, Metals Materials International, 25, 1191 (2019). Doi: https://doi.org/10.1007/s12540-019-00267-6
  2. M. Hong, H. Chae, Y. Kim, M. J. Song, J. Cho, W. C. Kim, T. B. Ha, and S. Y. Lee, Flow-Accelerated Corrosion Analysis for Heat Recovery Steam Generator in District Heating System, Korean Journal of Materials Research, 29, 11 (2019). Doi: https://doi.org/10.3740/MRSK.2019.29.1.11
  3. Y. Kim, H. Chae, M. Hong, M. J. Song, J. Cho, S. Y. Lee, W. C. Kim, and T. B. Ha, Corrosion Failure Analysis of the Convection Part of District Heating Peak Load Boiler, Corrosion Science and Technology, 18, 55 (2019). Doi: https://doi.org/10.14773/cst.2019.18.2.55
  4. H. Lee, H. Chae, J. Cho, W. C. Kim, J. C. Jeong, H. Kim, J. G. Kim, and S. Y. Lee, Corrosion Failure Analysis of Air Vents Installed at Heat Transport Pipe in District Heating System, Corrosion Science and Technology, 19, 189 (2020). Doi: https://doi.org/10.14773/CST.2020.19.4.189
  5. J. Cho, H. Chae, H. Kim, J.-G. Kim, W. C. Kim, J. C. Jeong, and S. Y. Lee, Failure Analysis of Air Vent Connected with Heat Supply Pipeline Under Manhole, Corrosion Science and Technology, 19, 196 (2020). Doi: https://doi.org/10.14773/CST.2020.19.4.196
  6. Y. S. Kim, H. Chae, W. C. Kim, J. C. Jeong, H. Kim, J.- G. Kim, and S. Y. Lee, Failure Analysis on Localized Corrosion of Heat Transport Pipe in District Heating System, Corrosion Science and Technology, 19, 122 (2020). Doi: https://doi.org/10.14773/cst.2020.19.3.122
  7. H. Chae, H. Wang, M. Hong, W. C. Kim, J.-G. Kim, H. Kim, and S. Y. Lee, Stress Corrosion Cracking of a Copper Pipe in a Heating Water Supply System, Metals Materials International, 26, 989 (2019). Doi: https://doi.org/10.1007/s1019-00386-0
  8. E. Paffumi, K.-F. Nilsson, and Z. Szaraz, Experimental and numerical assessment of thermal fatigue in 316 austenitic steel pipe, Engineering Failure Analysis, 47, 312 (2015). Doi: https://doi.org/10.1016/j.engfailanal.2014.01.010