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Integrity assessment of obsolete thermal storage tank in district heating system

Authors
YunD.ChaeH.Kim, HeesanH.KimJ.-G.KimW.C.HaT.B.JangJ.JeongJ.C.LeeS.Y.
Issue Date
2020
Publisher
Korean Institute of Metals and Materials
Keywords
Corrosion; Degradation; District heating system; Structural integrity; Thermal storage tank
Citation
Journal of Korean Institute of Metals and Materials, v.58, no.10, pp.693 - 702
Journal Title
Journal of Korean Institute of Metals and Materials
Volume
58
Number
10
Start Page
693
End Page
702
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12528
DOI
10.3365/KJMM.2020.58.10.693
ISSN
1738-8228
Abstract
The thermal storage tank in a district heating system is a component that stores excess heat during normal operation and releases the stored heat to increase the efficiency of the system, when the heat source is stopped or additional demands occur. Recently, an obsolete thermal storage tank was dismantled for the first time since it began operation 30 years ago. In this work, the corrosion integrity of the obsolete thermal storage tank was evaluated by examining its appearance, thickness thinning, corrosion products, microstructure, and mechanical properties. Samples were taken at various locations (roof, shell, bottom) of the thermal storage tank, which enabled diagnosis of the respective environmental degradations. Severe corrosion was found in the roof edge plate due to corrosion under the insulation, and exhibited thinning exceeding ~49% of the designed thickness. In this location, the ferrite-pearlite band structure disappeared and deteriorated microstructures, such as decarburization and spheroidized pearlite, were measured, which resulted in a ~27% decrease in hardness. The inner surfaces of the bottom and shell plate were well covered with a magnetite film, and the degradation of the microstructure and mechanical properties showed a permissible limit in terms of ASTM A285/ A516. In addition, no particular drop in hardness was found in the weld zone of each plate. Copyright © The Korean Institute of Metals and Materials
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