by Phillip E. Prueter, P.E. / Michael F.P. Bifano, Ph.D., P.E. / Seetha Ramudu Kummari, Ph.D., P.E. / May 01, 2017

In this article, the thermal-mechanical behaviors of multiple coke drum skirt designs, including forged, welded, and sliding configurations, are investigated using elastic and elastic-plastic finite element analysis (FEA), and corresponding fatigue life predictions are discussed for each type of design. Additionally, the effect of skirt slots is quantified. Finally, a cyclic plasticity material model is employed to establish shakedown, and a modern strain-based fatigue method is implemented, including a critical-plane approach. These results are compared to more conventional base metal and welded fatigue predictions.

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