Sizing limits of metal loss anomalies using tri-axial MFL measurements: A model study
Sizing limits of metal loss anomalies using tri-axial MFL measurements: A model study
复制标题
DOI：
10.1016/j.ndteint.2013.01.011
复制
发表时间：
2013-04-01
影响因子：
4.2
通讯作者：
Willems, Herbert
中科院分区：
文献类型：
--
作者：
Kopp, Gerhard;Willems, Herbert
模型研究的长度和宽度的测量能力的三个组成部分的漏磁（MFL）用于管道的在线检测。利用偶极子模型的长方体异常漏磁分析结果，研究了金属损失异常的长度和宽度测量的准确性和局限性。对于位于内部管壁的异常（特别是金属损失），长度和宽度尺寸的准确性要比外部异常好得多。这是由于内部异常位于更靠近MFL传感器的位置，因此在测量中不太平滑。一般来说，使用径向分量可以获得最佳的定径结果。模型结果表明，进一步提高目前的漏磁工具的轴向和周向分辨率，可以提高内部异常，特别是内部针孔的定径能力。对于外部异常，通过增加轴向采样预计不会有显著改善。(C)2013爱思唯尔有限公司保留所有权利。
A model study of the length and width sizing capabilities of the three components of the magnetic flux leakage (MFL) as used for inline inspections of pipelines is presented. The accuracy and limitations of the length and width sizing of metal loss anomalies are investigated using analytical results of the dipole model for the magnetic flux leakage of cuboidal anomalies. For anomalies (in particular metal loss) located at the internal pipe wall the accuracy of the length and width sizing is much better than for external anomalies. This is due to the fact that internal anomalies are located closer to the MFL sensors and thus are less smoothed in the measurements. In general the best results for the sizing are achieved using the radial component. The model results suggest that a further increase of both, the axial and circumferential resolution of current MFL tools can improve the sizing capabilities for internal anomalies, especially for internal pinholes. For external anomalies no significant improvement can be expected by increasing the axial sampling. (C) 2013 Elsevier Ltd. All rights reserved.