本文選題：漏磁檢測 + 有限元分析��； 參考：《西南石油大學》2015年碩士論文

【摘要】：油氣運輸管道失效,將導致大量人員傷亡、環(huán)境污染等災難性事故。因此為保證管道在工程運輸中的安全可靠性,對管道進行定期的無損檢測有著十分重要的意義。通過對比常用管道檢測方法,本文選定漏磁內檢測技術對管道進行檢測。在實際檢測過程中,管道焊縫、補板、法蘭、三通等鐵磁性材料管件在管道被磁化后會產生漏磁場,這將影響管道缺陷的檢測與位置判斷。為解決上述問題給管道檢測帶來的不便,本文從以下三個方面對上述問題進行研究。 首先,根據管道漏磁檢測基本原理及管道漏磁內檢測影響因素,對課題研究的X52管材、規(guī)格為(?)377mm×7mm的直縫鋼管漏磁檢測儀磁路進行設計,得出符合被測管道磁化檢測要求的磁路各部分具體尺寸。 其次,在ANSYS有限元分析理論基礎上,采用三維有限元動態(tài)分析法對管道缺陷(單個缺陷、相鄰缺陷)、管道焊縫、補板、法蘭、三通漏磁場進行數(shù)值模擬,分析上述漏磁場的磁通密度分布特征并進行對比分析,得出區(qū)分管道缺陷與管件漏磁場的特征參量,為后期管道缺陷的量化處理奠定基礎。 最后,通過分析缺陷漏磁場磁通密度分布,得出缺陷尺寸與磁通密度分量峰值、峰峰值間距之問的關系；并采用“SY/T6151-1995鋼質管道管體腐蝕損傷評價方法”標準對含缺陷管道剩余強度進行評價,對剩余強度不滿足管道安全運行要求的腐蝕缺陷區(qū)域提出一定的修補措施,以保證管道的可靠運營。 綜上所述,通過分析對比管道管件及管道缺陷漏磁場分布規(guī)律,得出識別區(qū)分缺陷與管件漏磁場的特征量,并對管道缺陷尺寸進行識別,對實際工程中管道漏磁檢測起到一定的指導意義。
[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.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE973.6

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本文編號：2073264