管道衰减系数对超声导波检测距离的影响

Effect of Pipeline Attenuation Coefficient on Ultrasonic Guided Wave Inspection Range

采用磁致伸缩超声导波技术对管道衰减系数与导波检测距离的关系进行了研究,针对不同埋设环境、不同衰减系数的管道,合理评估导波检测距离及检测成本,减少复杂环境下导波检测性能降低导致的检测费用增加、检测工期延长等问题的出现,从而更加合理地编制导波检测方案。首先对衰减系数与检测距离的关系进行了初步探讨,根据检测缺陷大小和衰减系数可计算出导波的检测距离;然后分别对地上管道、半埋地管道、埋地管道进行导波检测。检测结果表明,高衰减对导波检测距离有强烈的影响,不同埋设环境的管道,导波的衰减系数及检测距离有明显的差异。

The effect of attenuation on inspection range was studied experimentally by using the magnetostrictive ultrasonic guided wave technology,aiming to help the pipeline manager to assess the rang of inspection and the price of inspection,and to make proper inspection plan before carry out guided wave test,because the pipelines in complicated surroundings can cost more inspection time and inspection price.First, the relationship between attenuation and inspection range had been researched,then the range of inspection under known value of attenuation coefficient could be calculated.Three pipeline inspection experiments were undertaken in different surroundings （above ground pipeline, half-buried pipeline and buried pipeline ）.The experimental result shows that high attenuation strongly affects the range of inspection and a significant change in the attenuation coefficient and inspection range exists for different surroundings.