Corrosion risk-based subsea pipeline design
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Corrosion risk-based subsea pipeline design

机译：基于腐蚀风险的海底管道设计

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AbstractSubsea oil and gas pipelines are commonly designed with 3–6?mm internal corrosion allowance added to pipeline wall thickness often without pragmatic thought. The corrosion allowance is neither calculated with due diligence to localized effect nor address the uncertainty of corrosion input variables. Since inspection and monitoring are difficult and expensive task for subsea pipeline, the design could be made more robust if potential metal loss defect caused by internal corrosion were properly quantified and consolidated in the design. This paper exactly did that by characterizing all sorts of uncertainty related to metal loss defect and incorporating them in the design. Based on calculated failure probability for metal loss defect, design variables are revisited to ensure recommended target safety level is meet/achieved. Hence, the risk-based design is also optimized since under or overconservative design is avoided. As internal corrosion defect is dominant mode of failure other corrosion related failure probabilities, which could be integrated using FTA, are not considered in this study. One representative failure incident's basic variables have been excavated from Monte Carlo simulation to develop finite element model to assess the mechanical integrity of the pipeline when it fails according to burst models. Recommendations are provided where appropriate.Highlights?RAM analysis of corrosion inhibition system is conducted and incorporated in the Corrosion Risk-based Subsea Pipeline Design.?NORSOK Internal corrosion rate model with probabilistic data is considered in the Risk-based Subsea Pipeline Design.?Corrosion Risk-based design made the Subsea Pipeline robust and optimum for a particular safety class location.?Separate corrosion allowance is no longer required in Corrosion Risk-based Subsea Pipeline Design.]]>
机译：<！[CDATA [ 抽象 海底石油和天然气管道通常设计有3-6毫米的内部腐蚀余量，经常添加到管道壁厚度没有务实的想法。腐蚀津贴既不按尽职调查到局部效果，也不会解决腐蚀输入变量的不确定性。由于对海底管道的检查和监测难以昂贵的任务，因此如果在设计中正确量化并巩固了内部腐蚀引起的潜在金属损失缺陷，则可以使设计更加稳健。本文完全是这样做的，通过表征与金属损耗缺陷相关的各种不确定性并将它们纳入设计中。基于计算的金属损耗缺陷的故障概率，重新审视设计变量，以确保建议的目标安全水平满足/实现。因此，由于避免了以下或过度的设计，因此还优化了基于风险的设计。由于内部腐蚀缺陷是主导失效模式，但其他腐蚀相关的失败概率，可以在本研究中考虑使用FTA集成。从Monte Carlo仿真挖掘出一个代表性的失败事件的基本变量，以开发有限元模型，以评估根据突发模型失效时管道的机械完整性。适当的建议。 突出显示 ？ 对腐蚀抑制系统的RAM分析是在基于腐蚀风险的海底管道设计中的。 ？ 基于风险的海底管道设计中的具有概率数据的norsok内部腐蚀速率模型。 < / ce：list-item> ？ 基于腐蚀风险设计制作对于特定的安全等级位置，海底管道鲁棒和最佳。 ？ 基于腐蚀风险的海底管道设计中不再需要单独的腐蚀允许。 ]]>

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