| 王东军.考虑腐蚀影响的海洋柔性立管安全评估[J].装备环境工程,2025,22(5):130-137. WANG Dongjun.Safety Assessment of Marine Flexible Risers Considering Effects of Corrosion[J].Equipment Environmental Engineering,2025,22(5):130-137. |
| 考虑腐蚀影响的海洋柔性立管安全评估 |
| Safety Assessment of Marine Flexible Risers Considering Effects of Corrosion |
| 投稿时间：2025-04-07 修订日期：2025-04-21 |
| DOI：10.7643/issn.1672-9242.2025.05.017 |
| 中文关键词: 柔性立管 腐蚀 截面特性 刚度 局部强度 疲劳寿命中图分类号:TE973 TG172 文献标志码:A 文章编号:1672-9242(2025)05-0130-08 |
| 英文关键词:flexible pipe corrosion sectional properties stiffness local strength fatigue life |
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| 中文摘要: |
| 目的 考虑腐蚀的影响，对海洋柔性立管进行安全评估。方法 明确立管环空区域腐蚀环境的形成机理，对处于腐蚀环境下的金属条带截面尺寸变化进行量化分析。采用有限元方法，进行考虑腐蚀影响的柔性立管安全评估，重点研究腐蚀对立管结构刚度、局部强度以及疲劳寿命的影响。结果 随着腐蚀深度的增加，环空区域内金属条带的截面尺寸逐渐减小，导致立管的轴向刚度、弯曲刚度和扭转刚度逐步降低，其中轴向刚度和扭转刚度降低可达10%。刚度的降低直接导致条带应力增加，疲劳损伤随之增加。此外，由于腐蚀环境的形成，采用考虑腐蚀的S-N曲线替代干燥环境的S-N曲线，疲劳寿命由无限寿命减小到设计寿命的2.4倍。结论 腐蚀对柔性立管的结构刚度、局部强度和疲劳寿命均有显著影响。为了确保立管在长期服役下的安全性，在进行立管安全评估时，必须充分考虑腐蚀的影响，并采取有效的防腐措施和监测手段，以延长立管的使用寿命，降低失效风险。 |
| 英文摘要: |
| 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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