Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Failure Analysis of Air Vents Installed at Heat Transport Pipe in District Heating System

지역난방수 공급관 에어벤트 부식 파손 분석

  • Lee, Hyongjoon (Department of Materials Science and Engineering, Chungnam National University) ;
  • Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Cho, Jeongmin (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Woo Cheol (R & D Institute, Korea District Heating Corp.) ;
  • Jeong, Joon 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 Science and Engineering, Sungkyunkwan University) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • 이형준 (충남대학교 신소재공학과) ;
  • 채호병 (충남대학교 신소재공학과) ;
  • 조정민 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사 미래개발원) ;
  • 정준철 (한국지역난방공사 미래개발원) ;
  • 김희산 (홍익대학교 재료공학과) ;
  • 김정구 (성균관대학교 신소재공학부) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2020.05.22
  • Accepted : 2020.06.03
  • Published : 2020.08.31
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Abstract

Two air vents situated on a heat transport pipe in district heating system were exposed to the same environment for 10 years. However, one air vent was more corroded than the other. It also had a hole on the top of the front-end pipe. Comparative analysis was performed for these air vents to identify the cause of corrosion and establish countermeasures. Through experimental observation of the damaged part and analyses of powders sampled from air vents, it was found that corrosion was initiated at the top of the front-end pipe. It then spread to the bottom. Energy dispersive X-ray spectroscopy results showed that potassium and chlorine were measured from the corroded product in the damaged air vent derived from rainwater and insulation, respectively. The temperature of the damaged air vent was maintained at 75 ~ 120 ℃ by heating water. Rainwater-soaked insulation around the front-end pipe had been hydrolyzed. Therefore, the damaged air vent was exposed to an environment in which corrosion under insulation could be facilitated. In addition, ion chromatography and inductively coupled plasma measurements indicated that the matrix of the damaged front-end pipe contained a higher manganese content which might have promoted corrosion under insulation.

Keywords

References

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