The effect of corrosion defects on the collapse pressure of submarine pipelines.

Corrosion is one of the important components that cause failure of submarine pipelines, and accurate assessment of the impact of corrosion on the failure pressure of submarine pipelines is important for assessing the integrity of submarine pipelines. This paper first verifies the accuracy of finite element modeling of submarine pipelines containing corrosion defects using existing experimental results. On this basis, the influence of corrosion location, shape, and width on the collapse pressure of submarine pipelines under different corrosion lengths and depths is explored. It is found that the effect of corrosion length on the collapse pressure of submarine pipeline is weakened with the increase of corrosion length. The corrosion depth, shape and width will directly affect the collapse pressure of submarine pipeline. The change in corrosion location changes the failure pattern of submarine pipelines. Based on the extensive numerical analysis, this paper establishes a collapse pressure prediction model of the submarine pipelines relating to corrosion length, corrosion depth and corrosion width. Furthermore, the shape coefficient is introduced to establish the prediction model of corrosion shape and submarine pipeline collapse pressure. Compared with the Netto's collapse model evaluation results, the predicted results of the prediction model have higher reliability. • The influence of corrosion characteristic parameters on collapse pressure as well as buckling instability mode is revealed. • The collapse pressure prediction model of submarine pipeline is established, including corrosion length, corrosion depth and corrosion width. • A corrosion characterization parameter and submarine pipeline collapse pressure prediction model is established under different corrosion shapes. • It is compared with the results of the Netto's collapse model, the prediction model shows good reliability. [ABSTRACT FROM AUTHOR]