Electromagnetic Inspection of Outer Side Defect on Steel Tube With Steel Support Using 3-D Nonlinear FEM Considering Non-Uniform Permeability and Conductivity
Electromagnetic Inspection of Outer Side Defect on Steel Tube With Steel Support Using 3-D Nonlinear FEM Considering Non-Uniform Permeability and Conductivity
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DOI：
10.1109/tmag.2010.2044381
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发表时间：
2010-07
影响因子：
2.1
通讯作者：
Y. Gotoh;Atsushi Kiya;N. Takahashi
中科院分区：
文献类型：
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作者：
Y. Gotoh;Atsushi Kiya;N. Takahashi
石油化工装置中的换热器采用钢管。由于这些钢管通过支撑钢板（挡板）成束地分组，因此有必要从每个管的内部检查缺陷的存在。在这些钢管中，腐蚀或缺陷是由于与钢管外侧挡板的摩擦而产生的。本文采用三维非线性有限元法（FEM），研究了低激励频率（60 Hz左右）内线圈交流漏磁检测带隔板钢管外侧缺陷的问题。考虑到钢管和挡板内磁导率和电导率的不均匀性，采用三维有限元方法研究了磁噪声的探测特性。
Steel tubes are used in the heat exchanger in the petrochemical plant. Since these steel tubes are grouped in a bundle by the support steel plate (the baffle), it is necessary to inspect the existence of defects from the inside of each tube. In these steel tubes, the corrosion or the defects are generated by the friction with baffle at the outer side of steel tube. In this paper, problems in applying the ac flux leakage testing method using an inner coil of low exciting frequency (about 60 Hz) for the inspection of the outer side defect on steel tube with baffle are examined using 3-D nonlinear finite element method (FEM). Moreover, the detecting property of the magnetic noise is investigated by 3-D FEM considering the non-uniformity of the permeability and conductivity in the steel tube and the baffle.