Structural Integrity of Energy Pipelines: Assessment, Reliability and Optimization

能源管道的结构完整性：评估、可靠性和优化

• 批准号: RGPIN-2014-05232
• 负责人: Zhou, Wenxing
• 金额: $ 1.46万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=588288
• 关键词: Structural; Integrity; Energy; Pipelines; Assessment

Pressurized steel pipelines are widely recognized as the most economical means to transport large quantities of hydrocarbon products The Canadian energy pipeline industry operates approximately 115,000 km of oil and gas transmission pipelines. Maintaining the integrity and safe operation of this vast pipeline network has significant social and economic implications. New knowledge, models and methodologies that will assist the pipeline operators in achieving this goal are of significant practical value. The proposed research program is aimed at maintaining the structural integrity of steel pipelines under various threats, and consists of the following projects, namely 1) developing reliability-based pipeline corrosion management methodologies, 2) developing multi-objective optimal maintenance strategies, and 3) investigating the single-edge tension specimen for determining the fracture toughness. Over the last decade, the reliability-based pipeline corrosion management program has received growing attentions from pipeline operators because such a program provides an appropriate framework to account for various uncertainties involved in the corrosion inspection and assessment. The outcome of project 1) will fill the knowledge gap with respect to the spatial correlation of corrosion defects and provide a probabilistic framework to simultaneously make inference of the number and growth of corrosion defects on pipelines based on the inspection data. These methodologies will lead to realistic modeling of the degradation process associated with a corroding pipelines, which is critical to the determination of re-inspection interval, accurate evaluation of the time-dependent reliability of the pipeline and development of a phased defect mitigation plan that satisfies both the resource and reliability constraints. Optimal maintenance decisions for pipelines have significant safety and economic benefit to the society and the. The outcome of project 2) will provide guidance to pipeline engineers on the selection of maintenance plans to maximize reliability/safety and minimize cost at the same time. This is valuable not only from the perspective of the pipeline operators but also from the perspective of general public located in the vicinity of the pipelines. The strain-based assessment is being increasingly used to address large plastic deformation imposed on pipelines due to, for example, slope movement and ground subsidence. The fracture toughness resistance curve is a key input in the strain-based assessment of pipelines containing planar defects (i.e. cracks). The use of the single-edge tension specimen to experimentally determine the fracture toughness has gained much attention in the pipeline industry over the last decade, because the fracture toughness determined from such type of the specimen is more relevant to that of the full-scale pipe. The outcome of project 3) will facilitate the development and standardization of the single-edge tension specimen-based fracture toughness testing procedure, which can lead to more accurate evaluation of the fracture toughness and consequently more accurate strain-based assessment of pipelines containing cracks.

加压钢管道被广泛认为是运输大量碳氢化合物产品的最经济的手段。加拿大能源管道行业运营着大约11.5万公里的石油和天然气输送管道。维护这一庞大管道网络的完整性和安全运行具有重大的社会和经济意义。新的知识、模型和方法将帮助管道运营商实现这一目标，具有重要的实用价值。本研究项目旨在维护钢管在各种威胁下的结构完整性，包括：1)开发基于可靠性的管道腐蚀管理方法；2)开发多目标优化维护策略；3)研究单边拉伸试样以确定断裂韧性。在过去的十年中，基于可靠性的管道腐蚀管理方案受到了管道运营商越来越多的关注，因为该方案为考虑腐蚀检查和评估中涉及的各种不确定性提供了适当的框架。项目1)的成果将填补腐蚀缺陷空间相关性方面的知识空白，并提供一个基于检测数据同时推断管道腐蚀缺陷数量和增长的概率框架。这些方法将导致与腐蚀管道相关的退化过程的现实建模，这对于确定复检间隔、准确评估管道随时间变化的可靠性以及制定满足资源和可靠性约束的分阶段缺陷缓解计划至关重要。管道优化维修决策具有显著的社会效益和经济效益。项目2)的结果将为管道工程师选择维护计划提供指导，以最大限度地提高可靠性/安全性，同时降低成本。这不仅从管道运营商的角度来看是有价值的，而且从位于管道附近的普通公众的角度来看也是有价值的。基于应变的评估越来越多地用于解决由于斜坡运动和地面沉降等原因造成的管道大塑性变形。断裂韧性曲线是含平面缺陷（即裂纹）管道基于应变评估的关键输入。近十年来，利用单边拉伸试样实验测定断裂韧性在管道行业受到了广泛关注，因为这种试样测定的断裂韧性与全尺寸管道的断裂韧性更相关。项目3)的成果将促进基于单边拉伸试样的断裂韧性测试方法的发展和标准化，从而可以更准确地评估断裂韧性，从而更准确地评估含裂纹管道的应变。