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Effect of Geometry Variation on Plastic Collapse of Marine Pipeline  

Baek, Jong-Hyun (R&D Division, Korea Gas Corporation)
Kim, Woo-Sik (R&D Division, Korea Gas Corporation)
Publication Information
Journal of the Korean Institute of Gas / v.14, no.4, 2010 , pp. 45-50 More about this Journal
Abstract
The marine pipelines laid in deep waters were evaluated to verify the resistance on the plastic collapse to heavy ambient external pressure due to hydrostatic pressure. In this study, the plastic collapse behavior of the marine pipe subjected to hydrostatic pressure was evaluated with the ovality and ratio of diameter to thickness in FE analyses. A parametric study was shown that the internal pressure increased the plastic collapse depth by increasing of the resistance to the plastic collapse. It was also shown that the collapse depth of the pipeline having a local ovality was deeper than that of the pipeline having a global ovality. Finally, the plastic collapse depth decreased when either the ratio of diameter to thickness or the ovality increased.
Keywords
API 5L X65; FE-analyses; Marine pipelines; Ovality; Plastic collapse;
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