An analytical approach for predicting the collapse pressure of the flexible risers withinitial ovalization and gap

• Published in: Volume 5A: Pipelines, Risers, and Subsea Systems
• Main Authors: Li, X. (author), Jiang, X. (author), Hopman, J.J. (author)
• Format: Conference Object
• Language: English
• Published: ASME 2019
• Subjects: collapse strength; flexible risers; initial ovality; radial gap; Arctic
• Online Access: http://resolver.tudelft.nl/uuid:6f93ffa9-489a-4052-9fee-09c34a2f2d95; https://doi.org/10.1115/OMAE2019-95642

A flexible riser is a flexible pipe that transports materials between seafloor and topside structures. As oil and gas production heads to water depths greater than 3000 meters, huge hydrostatic pressure may cause the collapse failure of flexible risers. Generally, the collapse strength of a flexible riser is designed by considering the effects of initial imperfections, e.g., ovality of the carcass, and radial gap between the carcass/liner and pressure armor. These two imperfections may cause a significant reduction in the collapse strength of flexible risers under the flooded annulus condition. However, there are few analytical models available in the public literature that could take those factors into account. In this paper, an analytical approach is presented to predict the critical collapse pressure of the flexible risers with initial imperfections. The analytical results were compared with the numerical simulation, which showed reasonably good agreement. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Marine and Transport Technology Transport Engineering and Logistics Ship Design, Production and Operations