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Optimal slot dimension for skirt support structure of coke drums
Edward WANG, Zihui XIA
《机械工程前沿（英文）》 2018年 第13卷 第4期 页码 554-562 doi: 10.1007/s11465-018-0513-y
The skirt-to-shell junction weld on coke drums is susceptible to fatigue failure due to severe thermal cyclic stresses. One method to decrease junction stress is to add slots near the top of the skirt, thereby reducing the local stiffness close to the weld. The most common skirt slot design is thin relative to its circumferential spacing. A new slot design, which is significantly wider, is proposed. In this study, thermal-mechanical elastoplastic 3-D finite element models of coke drums are created to analyze the effect of different skirt designs on the stress/strain field near the shell-to-skirt junction weld, as well as any other critical stress locations in the overall skirt design. The results confirm that the inclusion of the conventional slot design effectively reduces stress in the junction weld. However, it has also been found that the critical stress location migrates from the shell-to-skirt junction weld to the slot ends. A method is used to estimate the fatigue life near the critical areas of each skirt slot design. It is found that wider skirt slots provide a significant improvement on fatigue life in the weld and slot area.
关键词： coke drum stress analysis cyclic stress fatigue life skirt slots
李大全,罗振钦,胡辉,张秀林
《中国工程科学》 2011年 第13卷 第5期 页码 88-92
为解决现有海上平台存在的预留井槽不足的问题，研究和开发了加挂井槽技术。面对海上平台的现实难题，通过对平台空间条件、钻井方式、平台结构及平台系统能力等的分析和研究，提出和确定加挂井槽的可行性，细化和完善加挂井槽的相关设计并将设计方案应用于工程实践。实践证明：加挂井槽解决了现有海上平台预留井槽不足的问题，具有结构简易、工程周期短、投资成本低等特点，能满足增打调整井的要求，经济社会效益显著。
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