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ISSN(Print): 1598-6462
ISSN(Online): 2288-6524
Issue: Bimonthly (2,4,6,8,10,12)
Type: Journal
Language: English/Korean
History: v1 n1 Feb. 2002
Index:ESCI (since 2017)
KCI (since 2019)
Scopus (since 2019)
Date: August 31, 2020
Vol: 19, Issue: 4
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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[Research Paper]
Failure Analysis of Air Vent Connected with Heat Supply Pipeline Under Manhole
맨홀에 설치된 지역난방 열공급관 에어벤트의 전단부 파손 원인 규명
Jeongmin Cho, Hobyung Chae, Heesan Kim, Jung-Gu Kim, Woo Cheol Kim, Joon Cheol Jeong, Soo Yeol Lee
조정민, 채호병, 김희산, 김정구, 김우철, 정준철, 이수열
Keywords: District heating, Air vent, Corrosion, Manhole, Rain water
Corros. Sci. Tech. , 2020, 19(4) pp. 196-202
® 10.14773/CST.2020.19.4.196
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Received: July 14, 2020;  Revised: July 29, 2020;  Accepted: July 29, 2020
Abstract:
The air vent connected to a heat supply pipeline in the district heating system has been used to eliminate the 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 in the 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-end of the air vent where the insulator was covered. While a thin oxide layer was formed in the interior of the 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 hydrolyzed insulator ejected the corrosion factors such as Cl-, SO42-, and NH4+. The findings suggest that the corrosion under insulation due to rain water is the main cause of the underlying failure in the air vent.
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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