Research on internal detection technology for axial crack of long-distance oil and gas pipeline based on micromagnetic method
Research on internal detection technology for axial crack of long-distance oil and gas pipeline based on micromagnetic method
复制标题
基于微磁法的长输油气管道轴向裂纹内部检测技术研究
DOI：
10.1177/1475921719877361
复制
发表时间：
2019-09-30
影响因子：
6.6
通讯作者：
Xu, Xiaobei
中科院分区：
文献类型：
--
作者：
Liu, Bin;Ma, Zeyu;Xu, Xiaobei
由于缺乏高效准确的检测手段，管道轴向裂纹严重威胁着输油管道的安全运行，因此将微磁无损检测技术应用于管道轴向裂纹检测领域具有现实意义。为了研究微磁信号对管道轴向裂纹的表征，基于微磁理论建立了管道轴向裂纹微磁信号检测的数值模型。计算了不同尺寸和方向裂纹的微磁检测信号的特征。分析了微磁检测信号的传播规律，并对X70管道进行了实验研究，验证了理论模型和仿真的正确性。结果表明，在轴向裂纹的每个尖端，微磁检测信号的轴向分量都有一个峰值和一个谷值，径向分量有一个极值。轴向裂纹处的微磁内检测信号的幅度随着裂纹深度或长度的增加而线性增加。微磁信号的传播规律符合下降指数函数，具体地说，裂纹深度越小，信号衰减越快，最终趋于稳定。用于检测与轴向成一定角度的裂纹的探头的微磁检测信号以等位移间距布置。
Due to the lack of the efficient and accurate detection method, the axial crack of pipeline seriously threatens the safe operation of oil pipeline, and therefore the application of micromagnetic nondestructive testing technology in the field of pipeline axial crack detection is of practical significance. To study the characterization of axial crack by micromagnetic signal, a numerical model of micromagnetic signal to detect the axial crack of pipeline is established based on the micromagnetic theory in this article. The characteristics of micromagnetic detection signals of cracks with different sizes and directions are calculated. The propagation law of micromagnetic detection signal is analyzed, and the experimental study of X70 pipeline is carried out to verify the correctness of theoretical model and simulation. The results show that at each tip of the axial crack, the axial component of the micromagnetic detection signal has a peak and a valley, and the radial component has an extreme value. The amplitude of the micromagnetic internal detection signal at the axial crack linearly increases as the depth or length of the crack increases. The propagation law of micromagnetic signal conforms to the falling exponential function, specifically, the smaller the crack depth, the faster the signal decays and eventually stabilizes. The micromagnetic detection signal of the probes to detect the crack having a certain angle with the axial direction is arranged with equal displacement spacing.