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Root causes analysis and countermeasures on unexpected perforation of tee pipe in the steam system of specialty chemical plant

机译：根本原因分析及对策特种化工厂蒸汽体系中TEE管道的意外穿孔

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摘要

The tee pipe is generally considered as one of the vulnerable fittings in the entire piping owing to the sudden change of the flow direction. Hence, it is necessary to carry out failure analysis and reliability evaluation on the tee pipe for safe operation of the industrial piping. In this study, unexpected perforation as well as corrosion of tee pipe in the steam system of a large specialty chemical plant was addressed. Based on the systematic and comprehensive investigation including materials inspection, morphologies observation, scales detection, water quality inspection and finite element analysis, it was determined that the failure was primarily ascribed to the synergism between the localized corrosion and the flow erosion. Particularly, the vortex effect in the corrosion pit further aggravated the extent. The detailed mechanisms were discussed and the pertinent countermeasures were proposed. Achievement of this paper will help to better understand the synergistic effect of erosion and corrosion on the tee pipe under similar service conditions.
机译：由于流动方向的突然变化，T恤管通常被认为是整个管道中的易受攻击的配件之一。因此，有必要对TEE管进行故障分析和可靠性评估，以便于工业管道安全运行。在这项研究中，解决了意外的穿孔以及在大型专业化学厂的蒸汽系统中的T型管道的腐蚀。基于系统和综合调查，包括材料检验，形态观察，缩放检测，水质检测和有限元分析，确定失败主要归因于局部腐蚀和流动侵蚀之间的协同作用。特别是，腐蚀坑中的涡流效应进一步加剧了程度。讨论了详细机制，提出了相关的对策。本文的成就将有助于更好地了解在类似的服务条件下TEE管道上的侵蚀和腐蚀的协同效应。

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