With the development of oil and gas resources extending to the deep sea, more and more submarine pipelines are applied, and the importance of the structural and functional integrity of submarine pipelines is becoming more and more prominent. Dent has long been considered one of the potential factors affecting the integrity of submarine pipelines, which can be formed when pipelines are impacted by falling objects from the sea surface.Due to the seabed subsidence, pipeline suspension and earthquake, mudslide activity and other factors, submarine pipelines may be under the combined action of external pressure and bending moment, seriously affecting the safe operation of submarine pipelines. The study of buckling damage and limit carrying capacity of submarine pipelines under combined external pressure and bending moment is of great significance.In this paper, the nonlinear finite method is used to study the local buckling damage of subsea pipelines with dent under combined loads. the process of the pipeline being dented by the impact of objects is simulated, and the influence of different dent types on the pipe bending mode and limit carrying capacity is considered. Based on the numerical results, a prediction formula of the limit bearing capacity of submarine dent pipelines is put forward. Finally, compared with the experimental results, the accuracy of the proposed method is verified, and the suggestion on the safety assessment of submarine pipelines is put forward, which can provide some reference for the practical engineering application.

Failure Mechanism and Limit Load Capacity of Subsea Pipelines With Dent Defects

Paper Proceedings: https://asmedigitalcollection.asme.org/OMAE/OMAE2021/volume/85116

OMAE 2021

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