Evaluation of Electromagnetic Inspection of Outer Side Defect on Small Diameter and Thick Steel Tube With Steel Support Using 3-D Nonlinear FEM
Evaluation of Electromagnetic Inspection of Outer Side Defect on Small Diameter and Thick Steel Tube With Steel Support Using 3-D Nonlinear FEM
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DOI：
10.1109/tmag.2014.2335207
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发表时间：
2014-12
影响因子：
2.1
通讯作者：
Y. Gotoh;Y. Ishida
中科院分区：
文献类型：
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作者：
Y. Gotoh;Y. Ishida
石油化工厂的换热器采用钢管。由于这些钢管由支撑钢板捆扎成束，因此有必要从每根钢管内部检查是否存在缺陷。在这些钢管中，腐蚀或缺陷是由于与钢管外侧的支撑钢板发生摩擦而产生的。提出了一种仅利用交流磁场进行电磁检测的方法。采用考虑涡流的三维非线性有限元方法，分析了交流磁通在钢管和支撑钢板中的行为。结果表明，在不受高透气性支承钢板影响的情况下，可以实现外侧缺陷的检测。通过验证实验，验证了该方案检测方法的有效性。
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, 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 the support steel plate at the outer side of steel tube. In this paper, the electromagnetic inspection method using only ac magnetic field is proposed. The behavior of ac flux in the steel tube and support steel plate is examined using 3-D nonlinear finite element method taking account of eddy current. It is shown that the detection of outer side defect is possible without being influenced by the support steel plate with high permeability. The usefulness of this proposal inspection method is shown by verification experiment.