맨홀에 설치된 지역난방 열공급관 에어벤트의 전단부 파손 원인 규명
Failure Analysis of Air Vent Connected with Heat Supply Pipeline Under Manhole
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The air vent connected to a heat supply pipeline in the district heating system has been used to eliminatethe existing air in the pipe, which has a detrimental effect on corrosion durability and heat efficiency. Recently,the air vent installed under a manhole for 22 years was corroded and several pinholes were detected inthe front-end of the air vent. To identify the cause of the failure, thickness reduction, corrosion products,and water quality were examined. The corrosion damage was significant at the outside of the front-endof the air vent where the insulator was covered. While a thin oxide layer was formed in the interior ofthe tube, the coarse and porous corrosion products consisting of magnetite and hematite were found externally. Water flowing into the thermal insulator was absorbed by the insulator following hydrolysis. The hydrolyzedinsulator ejected the corrosion factors such as Cl-, SO42-, and NH4+. The findings suggest that the corrosionunder insulation due to rain water is the main cause of the underlying failure in the air vent.
Abstract
The air vent connected to a heat supply pipeline in the district heating system has been used to eliminatethe existing air in the pipe, which has a detrimental effect on corrosion durability and heat efficiency. Recently,the air vent installed under a manhole for 22 years was corroded and several pinholes were detected inthe front-end of the air vent. To identify the cause of the failure, thickness reduction, corrosion products,and water quality were examined. The corrosion damage was significant at the outside of the front-endof the air vent where the insulator was covered. While a thin oxide layer was formed in the interior ofthe tube, the coarse and porous corrosion products consisting of magnetite and hematite were found externally. Water flowing into the thermal insulator was absorbed by the insulator following hydrolysis. The hydrolyzedinsulator ejected the corrosion factors such as Cl-, SO42-, and NH4+. The findings suggest that the corrosionunder insulation due to rain water is the main cause of the underlying failure in the air vent.
참고문헌 (16)
- Hobyung Chae, "Stress Corrosion Cracking of a Copper Pipe in a Heating Water Supply System", Metals and Materials International, 26(7), pp.989~997 (2020), 대한금속·재료학회[DOI]
- Minki Hong, "Failure Analysis of a Water Wall Boiler Tube for Power Generation in a District Heating System", Metals and Materials International, 25(5), pp.1191~1201 (2019), 대한금속·재료학회[DOI]
- 김영수, "지역난방 첨두부하보일러 대류부 부식 파손 분석", CORROSION SCIENCE AND TECHNOLOGY, 18(2), pp.55~60 (2019), 한국부식방식학회
- 홍민기, "지역난방 배열 회수 보일러의 유동 가속 부식 원인 고찰", 한국재료학회지, 29(1), pp.11~15 (2019), 한국재료학회[DOI]
- 홍민기, "지역난방 시스템의 순환수에 따른 보일러 튜브의 부식 특성", CORROSION SCIENCE AND TECHNOLOGY, 17(6), pp.287~291 (2018), 한국부식방식학회[DOI]
- S. B. Kwon, "A study on the improvement of air vent system in pipping", pp.23~24 (1997), Land and Housing Institute
- 김형석, "지역난방 열배관망 운영데이터 기반의 파손확률 모델 개발", Korean Chemical Engineering Research(HWAHAK KONGHAK), 55(3), pp.322~331 (2017), 한국화학공학회
- 박진은, "실데이터 분석을 통한 지역난방 열배관의 피로안전성 평가", 한국강구조학회 논문집, 23(5), pp.569~579 (2011), 한국강구조학회
- 공재향, "지역난방용 매설배관의 열응력 흡수에 관한 연구", 한국생산제조학회지, 14(1), pp.81~88 (2005), 한국생산제조학회
- E. R. Monazam, , Ind. Eng. Chem. Res, 53, pp.13320~ (2014)[DOI]
- W. S. Kang, , Proc. KFMA Annual Meeting, pp.214~215 (2017), Korean Society for Fluid Machinery
- M. Y. Han, , Proc. Eighth Int. Water Technology Conf, pp.61~71 (2004), International Water Technology Association
- R. Javaherdashti, , J. Mat. Sci. Surf. Eng, 2, pp.36~ (2014)
- J. S. Kim, , News and Info. Chem. Eng., 29, pp.77~ (2011)
- "KOSHA GUIDE M-116-2012"[URL]
- "KOSHA GUIDE M-143-2012"[URL]