A failure analysis of fillet joint cracking in an oil storage tank |
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| Authors: | Jae-Seong Kim Dae-Hwan An Sang-Yul Lee Bo-Young Lee |
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| Institution: | 1. NRL for Cracking Control and Management, Department of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang-city, 412-791 Kyunggi-do, Republic of Korea;2. NRL for Cracking Control and Management, Department of Materials Engineering, Korea Aerospace University, Goyang-city, 412-791 Kyunggi-do, Republic of Korea;1. National Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China, 25 South Section 3, 2nd Ring Road, Chengdu, Sichuang 610041, People?s Republic of China;2. National Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China, 25 South Section 3, 2nd Ring Road, Chengdu, Sichuang 610041, People?s Republic of China;1. School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, Guangxi 535011, China;3. Guangxi Special Equipment Supervision and Inspection Institute, Nanning 530219, China |
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| Abstract: | This paper has studied failure of an oil storage tank. During operation, several cracks were observed at the fillet weldment between reactor shell and annular plates in the bottom of oil storage tank. Extreme stresses in the structure during its operation were determined taking into account shape and geometry imperfections as well as corrosion influence. Both reactor shell and annular plates are made of carbon steel (SM53C). In this study, in order to identify the causes for the fillet weldment cracking, failure analysis such as fractography, tensile test, hardness test, corrosion test(SSRT), chemical analysis was performed. The failure of oil storage tank is the result of the combined and synergistic interaction of mechanical stress and corrosion reactions. Although cracks were initiated by corrosion, failure was generated by propagation of crack caused by stresses concentration. It was recommended that (1) the local stresses be reduced by improved weld toe geometry, and (2) the reinforcement be used in order to avoid failure by stresses concentration. |
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