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| Cause analysis of tube head leakage of air cooler |
| GUO Haixia, WANG Shining, CAI Haichen, ZHANG Jiaqi |
| Luoyang Ship Material Research Institute, Luoyang 471023, China |
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Abstract The leakage of pipe head (at the weld of tube sheet welded joint) occurred in the vulcanization process of diesel hydrotreating air cooler during running. The failure mode and reason were found through the microscopical examination, composition and microstructure analysis, and corrosion characteristic analysis of the pipe head of air cooler. It was found that the failure mode was sulfide stress corrosion. There were two reasons. One reason is the improper control of welding process. The welding cooling speed was fast, resulting in the formation of hardened structure. Another reason is the post weld heat treatment (PWHT) was also insufficient and the hardened structure was not improved.
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Received: 16 March 2022
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2023, Vol. 41 
