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首页> 外文期刊>Journal of Pressure Vessel Technology >The Design of a Mechanical Damage Inspection Tool Using Dual Field Magnetic Flux Leakage Technology
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The Design of a Mechanical Damage Inspection Tool Using Dual Field Magnetic Flux Leakage Technology

机译：基于双场漏磁技术的机械损伤检测工具的设计

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摘要

This paper describes the design of a new magnetic flux leakage (MFL) inspection tool that performs an inline inspection to detect and characterize both metal loss and mechanical damage defects. An inspection tool that couples mechanical damage assessment as part of a routine corrosion inspection is expected to have considerably better prospects for application in the pipeline industry than a tool that complicates existing procedures. The design is based on study results that show it is feasible to detect and assess mechanical damage by applying a low magnetic field level in addition to the high magnetic field employed by most inspection tools. Nearly all commercially available MFL tools use high magnetic fields to detect and size metal loss such as corrosion. A lower field than is commonly applied for detecting metal loss is appropriate for detecting mechanical damage, such as the metallurgical changes caused by impacts from excavation equipment. The lower field is needed to counter the saturation effect of the high magnetic field, which masks and diminishes important components of the signal associated with mechanical damage. Finite element modeling was used in the design effort and the results have shown that a single magnetizer with three poles is the most effective design. Furthermore, it was found that for the three-pole system the high magnetization pole must be in the center, which was an unexpected result. The three-pole design has mechanical advantages, including a magnetic null in the backing bar, which enables installation of a pivot point for articulation of the tool through bends and restrictions. This design was prototyped and tested at Battelle's Pipeline Simulation Facility (West Jefferson, OH). The signals were nearly identical to results acquired with a single magnetizer reconfigured between tests to attain the appropriate high and low field levels.
机译：本文介绍了一种新型磁通量泄漏（MFL）检查工具的设计，该工具可以执行在线检查以检测和表征金属损失和机械损坏缺陷。与将现有程序复杂化的工具相结合，将机械损伤评估作为常规腐蚀检查的一部分的检验工具有望在管道行业中获得更好的应用前景。该设计基于研究结果，表明除大多数检查工具采用的强磁场外，还可以通过施加低磁场水平来检测和评估机械损伤。几乎所有市售的MFL工具都使用强磁场来检测和确定腐蚀等金属损失的大小。比通常用于检测金属损失的磁场低的磁场适合于检测机械损伤，例如由于挖掘设备的冲击而引起的冶金变化。需要较低的磁场来抵消高磁场的饱和效应，该效应会掩盖并减少与机械损伤相关的信号的重要分量。设计工作中使用了有限元建模，结果表明，具有三极的单个磁化器是最有效的设计。此外，发现对于三极系统，高磁化极必须位于中心，这是出乎意料的结果。三极设计具有机械优势，包括在支撑杆中具有磁性零点，从而可以安装枢轴点以通过弯曲和限制来铰接工具。该设计在Battelle的管道仿真设施（俄亥俄州西杰斐逊）进行原型设计和测试。信号几乎与在测试之间重新配置单个磁化器以获取适当的高场和低场水平所获得的结果相同。

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