Statoil have experienced failures in a number of flexible risers due to collapse, overload, tearing and unspiraling of the carcass in pipe structures with multi-layer PVDF pressure barrier. The paper will discuss the carcass failure modes that are characteristic for multilayer flexible pipes with particular focus on the failures due to carcass tearing. The nature of the carcass tearing problem is explained and suggestions for load model and operational policy for mitigation risk of new failures is presented.
Carcass Failures in Multilayer PVDF Risers
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Farnes, K, Kristensen, C, Kristoffersen, S, Muren, J, & Sødahl, N. "Carcass Failures in Multilayer PVDF Risers." Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 4A: Pipeline and Riser Technology. Nantes, France. June 9–14, 2013. V04AT04A024. ASME. https://doi.org/10.1115/OMAE2013-10210
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