输油管道锻制管件漏磁检测与典型缺陷识别研究

发布时间：2018-06-27 08:10

本文选题：漏磁检测 + 有限元分析　；参考：《西南石油大学》2015年硕士论文

【摘要】：油气运输管道失效,将导致大量人员伤亡、环境污染等灾难性事故。因此为保证管道在工程运输中的安全可靠性,对管道进行定期的无损检测有着十分重要的意义。通过对比常用管道检测方法,本文选定漏磁内检测技术对管道进行检测。在实际检测过程中,管道焊缝、补板、法兰、三通等铁磁性材料管件在管道被磁化后会产生漏磁场,这将影响管道缺陷的检测与位置判断。为解决上述问题给管道检测带来的不便,本文从以下三个方面对上述问题进行研究。首先,根据管道漏磁检测基本原理及管道漏磁内检测影响因素,对课题研究的X52管材、规格为(?)377mm×7mm的直缝钢管漏磁检测仪磁路进行设计,得出符合被测管道磁化检测要求的磁路各部分具体尺寸。其次,在ANSYS有限元分析理论基础上,采用三维有限元动态分析法对管道缺陷(单个缺陷、相邻缺陷)、管道焊缝、补板、法兰、三通漏磁场进行数值模拟,分析上述漏磁场的磁通密度分布特征并进行对比分析,得出区分管道缺陷与管件漏磁场的特征参量,为后期管道缺陷的量化处理奠定基础。最后,通过分析缺陷漏磁场磁通密度分布,得出缺陷尺寸与磁通密度分量峰值、峰峰值间距之问的关系；并采用“SY/T6151-1995钢质管道管体腐蚀损伤评价方法”标准对含缺陷管道剩余强度进行评价,对剩余强度不满足管道安全运行要求的腐蚀缺陷区域提出一定的修补措施,以保证管道的可靠运营。综上所述,通过分析对比管道管件及管道缺陷漏磁场分布规律,得出识别区分缺陷与管件漏磁场的特征量,并对管道缺陷尺寸进行识别,对实际工程中管道漏磁检测起到一定的指导意义。
[Abstract]:Failure of oil-gas transportation pipeline will lead to a large number of casualties, environmental pollution and other catastrophic accidents. Therefore, in order to ensure the safety and reliability of pipeline in engineering transportation, it is of great significance to carry out regular nondestructive testing of pipeline. By comparing the common pipeline detection methods, this paper selected magnetic flux leakage detection technology to detect the pipeline. In the process of actual inspection, pipe fittings of ferromagnetic material such as pipe weld, patch, flange, three-way and other ferromagnetic materials will produce magnetic leakage after the pipe is magnetized, which will affect the detection and location judgment of pipeline defects. In order to solve the inconvenience caused by the above problems, this paper studies the above problems from the following three aspects. First of all, according to the basic principle of pipeline magnetic flux leakage detection and the influencing factors of pipeline magnetic flux leakage detection, the magnetic circuit of the X52 pipe studied in this paper is designed, and the magnetic circuit of the magnetic leakage detector of the straight slit steel tube with the specification of (?) 377mm 脳 7mm is designed. The specific dimensions of each part of the magnetic circuit in accordance with the requirements of the magnetization detection of the pipeline under test are obtained. Secondly, on the basis of ANSYS finite element analysis theory, three dimensional finite element dynamic analysis method is used to simulate pipeline defects (single defect, adjacent defect), pipeline weld, patch plate, flange, three-way leakage magnetic field. The magnetic flux density distribution characteristics of the leakage magnetic field are analyzed and compared, and the characteristic parameters to distinguish the pipe defects from the pipe leakage magnetic field are obtained, which lays a foundation for the quantitative treatment of the pipeline defects in the later stage. Finally, by analyzing the flux density distribution of the defect leakage magnetic field, the relationship between the defect size and the peak value of the flux density component and the peak-to-peak distance is obtained. The residual strength of pipeline containing defects is evaluated by SY-T6151-1995 method of corrosion damage evaluation of steel pipe body, and some repair measures are put forward for the corroded defect area where residual strength does not meet the requirements of pipeline safety operation. To ensure the reliable operation of the pipeline. To sum up, through analyzing and comparing the distribution law of leakage magnetic field of pipe fittings and pipe defects, the characteristic quantity of distinguishing defect and pipe leakage magnetic field is obtained, and the size of pipeline defects is identified. It has certain guiding significance for pipeline magnetic flux leakage detection in practical engineering.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.6

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