Decommissioning process of hydrogen storage tank in a power station and application of PAUT technology
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摘要: 在执行对某电站氢气储罐（三类压力容器）的定期在役检查过程中，发现其焊缝中存在超标缺陷。通过一系列检测（包括磁粉检测、超声检测、相控阵超声检测、超声波衍射时差法、射线检测等）及一系列返修、再检测（包括缺陷返修、返修部位施焊、热处理、热处理后检测；再次缺陷返修、返修后检测、热处理、水压试验、水压试验后检测）等处理，最终发现焊缝中仍然存在超标扩展缺陷。经过容器检验综合评价，对该容器做报废处理。超标缺陷的失效分析结论进一步证明了检验结论的正确性。Abstract: During the regular inspection of hydrogen storage tanks (three types of pressure vessels) of a power station, it was found that there were defects exceeding the allowed limit in the welding seams. Through a series of tests(including MT,UT, PAUT, TOFD, RT, etc.) and a series of repair(including defect repair, welding of repaired parts, heat treatment and post-heat treatment detection), in the end, it was found that there were still defects exceeding the allowed limit in the welding seam. After container inspection and comprehensive evaluation, the container is scrapped. A failure analysis was carried on for the over-limit defect. The failure analysis conclusion further proves that the inspection conclusion is correct.
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Keywords:
- pressure vessel /
- phased array ultrasonic detection /
- excess defect
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