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

Conference paper (2019)

Authors

X. Li Marine and Transport Technology

X. Jiang Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering

J.J. Hopman Ship Design, Production and Operations - Mechanical, Maritime and Materials Engineering , Marine and Transport Technology

Research Group

Ship Design, Production and Operations (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1115/OMAE2019-95642

Flexible risers Collapse strength Initial ovality Radial gap

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Published Date

2019

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Ship Design, Production and Operations

Abstract

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.

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