长输油气管道弱磁应力内检测技术

发布时间：2018-03-25 06:11

本文选题：油气管道　切入点：弱磁　出处：《机械工程学报》2017年12期

【摘要】：应力集中是导致油气管道发生破坏的重要原因,它的存在给管道的安全运行带来风险。针对油气管道的应力在线检测及风险评价,提出弱磁应力内检测技术。对弱磁信号产生的原因进行分析,利用基于第一性原理的材料仿真软件对铁磁材料在受力过程中的弱磁效应进行计算。提出管道差异运行压力下二次弱磁内检测法,给出油气管道应力集中程度的评价方法。自主研发高精度弱磁应力内检测装置并在实际管道中进行应用,实现长输管道应力集中的在线内检测及风险评价。利用各种检测手段对检测结果进行现场验证。结果表明:弱磁信号的产生与应力及其损伤状态直接相关。应力作用根本上导致原子磁矩变化,宏观表现为弱磁信号随应力的变化而变化。管道差异运行压力二次弱磁内检测可以准确评价管道应力集中风险程度。工程实际应用及开挖验证表明了管道弱磁应力内检测技术的可行性及有效性。
[Abstract]:Stress concentration is an important reason leading to the failure of oil and gas pipelines, and its existence brings risks to the safe operation of oil and gas pipelines. This paper puts forward the technique of internal detection of weak magnetic stress, and analyzes the cause of weak magnetic signal. Based on the first-principle material simulation software, the weak magnetic effect of ferromagnetic material in the process of loading is calculated, and the method of secondary weak magnetic internal detection under the differential operating pressure of pipeline is proposed. The evaluation method of stress concentration degree of oil and gas pipeline is given. On-line detection and risk assessment of stress concentration in long distance pipeline are realized. The results are verified by various testing methods. The results show that the generation of weak magnetic signal is directly related to the stress and its damage state. The action basically causes the atomic magnetic moment to change. The signal of weak magnetic field changes with the change of stress. The degree of stress concentration risk can be accurately evaluated by the second weak magnetic field detection of pipeline differential operating pressure. The engineering application and excavation verification show that the weak magnetic field of pipeline is weak magnetic response. Feasibility and effectiveness of in-force detection technology.
【作者单位】：中国石油天然气股份有限公司西部管道分公司;沈阳工业大学信息科学与工程学院;
【基金】：科技部国家重大仪表专项(2012YQ090175) 国家自然科学基金(61571308) 辽宁省教育厅科学研究(L2016009)资助项目
【分类号】：TE973.6

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