Numerical modelling techniques for the assessment of dented pipelines

管道作为一种安全、可靠和环保的石油和天然气运输方式，在加拿大和世界各地被广泛使用。穿越不同地面条件的管道有时会受到外界干扰的轻微机械损伤。凹坑是导致管壁塑性变形的一种机械损伤。受壁面凹陷影响的管道的性能还不是很清楚。因此，当前的管道设计规范推荐了一种昂贵的解决方案，即对于凹陷深度为管道直径的2%至6%的管道，去除凹陷部分。为了开发一种经济有效的解决凹陷管道的方法，在目前的研究中，将发展数值模拟技术来评估管道受到壁面凹陷的影响。将开发有限元建模技术，以模拟凹陷形成的机制，并评估凹陷管道在使用负荷下的性能。研究结果将有助于更新管道设计规范，更好地了解凹陷管道的行为。该行业协作者将利用这些结果为管道行业提供管道完整性评估服务，以安全和经济地运输石油和天然气。****

Pipelines are extensively used across Canada and worldwide as a safe, reliable and environmentally friendly way of transporting oil and gas. The pipelines traversing different ground conditions are sometime subjected to minor mechanical damages from external interference. A dent is a type of mechanical damage resulting in a plastic deformation of pipe wall. The performance of the pipes subjected to the wall dents are not well-understood. As a result, current pipeline design codes recommend an expensive solution of removing the dented portion for pipes having a dent depth of 2% to 6% of the pipe diameter. To develop a cost-effective solution for the dented pipes, in the current research, numerical modelling techniques will be developed for the assessment of the pipeline subjected to wall dents. Finite element modelling techniques will be developed for simulating the mechanisms involved in dent formation and for assessing the performance of dented pipes under service loads. The research findings would be useful for updating the pipe design codes with better understanding the behavior of the dented pipes. The industry collaborator will utilize the results to provide pipeline integrity assessment services to the pipeline industry for safe and economic transportation of oil and gas. ****