漏磁检测器用于海底管道的磁化研究

Magnetization study of MFL detector for submarine pipelines

为了研制海底管道漏磁检测器,使用陆上管道漏磁检测器对海底管道的磁化效果进行研究。利用Ansys有限元仿真软件分析了海底管道厚壁管、混凝土配重层、双层管对漏磁场的影响。小口径漏磁检测器用于海底双层管检测时,被测管壁的磁场强度可达漏磁检测磁场要求阈值下限,需要改进。大口径漏磁检测器用于海底管道检测时,管壁的磁场强度能够达到漏磁检测的要求,缺陷信号量化和识别精度亦能够满足漏磁检测器的设计要求。研究成果对指导海底管道漏磁检测器的开发具有重要意义。

In order to develop magnetic flux leakage（MFL） detector for submarine pipeline,magnetization effect on submarine pipeline is studied using onshore MFL detector.The finite element simulation software Ansys is used to analyze the effects of submarine thick wall pipe,concrete weighted coating and double-layered tube on leakage magnetic field.When a small-size flux leakage detector is used to detect submarine double-layered tube,the magnetic field strength of the tube wall can reach the lower threshold of required magnetic field of MFL testing,and therefore the detector needs to be improved.When a large-size flux leakage detector is used to detect submarine tube,the magnetic field strength of the tube wall can reach the requirements of MFL testing,and the quantification and identification accuracy of defect signals also can meet the design requirements of MFL detector.The research results are of great significance to guide the development of MFL detector for submarine pipelines.