A parametric pit design in the outer surface of the oil pipeline buried under the soil atmosphere is investigated. This study analyzes the effect of pit size and corrosion contours to evaluate the metal degradation due to various characteristics that impact the corrosion on the oil pipeline. A 3D design of the model has been chosen, and its geometry is modeled in COMSOL MULTIPHYSICS, and appropriate meshing is done before computing to analyze impact of pit size and electron current density in oil pipeline. The behaviour of the pit design was then analysed using various parameters such as electron current density, corrosion rate, the impact of the pit size in localized area. The current findings in the study shows that risk of metal degradation and the depth of the pit size gives a relationship for corrosion in the localized area and the risk for pitting corrosion can be reduced by improving pipeline condition monitoring.

中文翻译：

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油气管道坑洞及其对电化学腐蚀反应的影响分析

研究了埋在土壤大气下的输油管道外表面的参数化坑设计。本研究分析了坑大小和腐蚀轮廓的影响，以评估由于影响输油管道腐蚀的各种特征而导致的金属退化。已选择模型的 3D 设计，并在 COMSOL MULTIPHYSICS 中对其几何形状进行建模，并在计算前进行适当的网格划分，以分析油管中坑尺寸和电子电流密度的影响。然后使用各种参数分析坑设计的行为，例如电子电流密度、腐蚀速率、坑尺寸对局部区域的影响。