Burst pressure prediction of pipelines with interacting defects is essential in the integrity assessment of steel pipelines. A series of evaluation criteria have been proposed to predict the burst pressure. However, the burst pressure is not accurately estimated by the existing evaluation methods for some defect distribution cases, especially for circumferentially aligned defects. In this study, a new evaluation method of burst pressure is established by developing a reliable calculation expression of the effective defect depth. A burst pressure study is performed by considering the effects of the defect distribution, defect size and circumferential spacing between two adjacent defects based on finite element analysis. Then, the detailed expression of effective depth of circumferentially aligned defects with different sizes is obtained. Full-scale burst tests for corroded pipelines are conducted to validate the accuracy of the new evaluation method. The predictions of burst capacity by the new method used for the pipeline with circumferentially aligned defects are in good agreement with experimental results for varying defect sizes and pipeline steel grades. Finally, the proposed evaluation method is verified equally applicable to various defect distribution modes.

具有相互作用缺陷的管道的爆破压力预测对于钢管的完整性评估至关重要。已经提出了一系列评估标准来预测爆破压力。然而，对于某些缺陷分布情况，特别是对于周向对齐的缺陷，爆破压力不能通过现有的评估方法准确估计。在本研究中，通过开发有效缺陷深度的可靠计算表达式，建立了一种新的爆破压力评估方法。基于有限元分析，通过考虑缺陷分布，缺陷尺寸和两个相邻缺陷之间的周向间距的影响，进行爆破压力研究。然后，获得了具有不同尺寸的周向对准缺陷的有效深度的详细表达式。进行了腐蚀管道的全面爆破测试，以验证新评估方法的准确性。通过新方法对周向排列缺陷的管道的爆破能力的预测与缺陷尺寸和管道钢种变化的实验结果非常吻合。最后，对所提出的评估方法进行了验证，同样适用于各种缺陷分布模式。