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| Safety Assessment of Marine Flexible Risers Considering Effects of Corrosion |
| Received:April 07, 2025 Revised:April 21, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.05.017 |
| KeyWord:flexible pipe corrosion sectional properties stiffness local strength fatigue life |
| Author | Institution |
| WANG Dongjun |
Bureau Veritas Marine China Co., Ltd., Shanghai , China |
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| Abstract: |
| The work aims to assess the safety of flexible risers considering the effects of corrosion. Based on the understanding of corrosion mechanism in the annulus, the changes in sectional dimensions of metal wires in corrosive environments were quantified. The safety assessment of a flexible riser was conducted using finite element method, with a focus on investigating the influence of corrosion on the riser's structural stiffness, local strength and fatigue life. As the corrosion depth increased, the sectional dimensions of the metal wires in the annular space decreased gradually, leading to a reduction in the riser's axial, bending and torsional stiffness, and a 10% reduction was seen for the axial and torsional stiffness. The reduction in stiffness directly resulted in an increase in the wire stress, which in turn increased the fatigue damage. In addition, an S–N curve considering corrosion instead of that for the dry annulus should be used in the assessment due to the corrosive environment, reducing the fatigue life from infinity to 2.4 times the design life. It's concluded that corrosion has a significant effect on the structural stiffness, local strength and fatigue life of flexible risers. To ensure the safety of risers in service, the effects of corrosion must be fully considered during safety assessments. Furthermore, effective anti-corrosion measures and monitoring techniques should be implemented to extend the service life of the riser and reduce the risk of failure. |
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