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首页> 外文会议>ASME international pipeline conference 2008 >TESTING OF A DUAL FIELD MAGNETIC FLUX LEAKAGE (MFL) INSPECTION TOOL FOR DETECTING AND CHARACTERIZING MECHANICAL DAMAGE FEATURES
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TESTING OF A DUAL FIELD MAGNETIC FLUX LEAKAGE (MFL) INSPECTION TOOL FOR DETECTING AND CHARACTERIZING MECHANICAL DAMAGE FEATURES

机译：用于检测和表征机械损伤特征的双场磁通量泄漏（MFL）检查工具的测试

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Battelle has developed dual field magnetic flux leakage (MFL) technology for the detection and characterization of mechanical damage to pipelines. The basic principle involves the use of a high magnetic field between 140 and 180 Oersted (11.1 to 14.3 kA/m) and the use of a low magnetic field between 50 and 70 Oersted (4 to 5.6 kA/m). At high magnetic field levels, the flux leakage signal is primarily influenced by changes in the geometry of a pipe wall. At low magnetic field levels, the MFL signal is due to residual stresses and metallurgical changes as well as geometry changes to the pipe caused by mechanical damage and wall thinning. A decoupling signal processing method developed by Battelle is used to isolate the portion of the mechanical damage signals due to metallurgical damage and residual stresses, which allows the characteristics of a dent-gouge feature to be more clearly differentiated. The decoupling method involves first scaling down the high field signal to the level of the low field signal, and then subtracting it from the low field signal. This produces a decoupled signal that is primarily influenced by the residual stresses and metallurgical changes caused by mechanical damage.rnRosen has developed a tool to test the dual field technology and is evaluating tool performance by running the tool in a 30 inch diameter pipeline segment. The tool itself is composed of three separate modules coupled together: a high field unit downstream of a low field unit which is downstream of a calipcr arm unit that is used to detect and characterize reductions in the internal diameter. The general and magnetic design of the tool, along with the scaling algorithm isrndiscussed. Results from a pull test in a pipe section with dents whose geometry has been independently characterized are also discussed.rnThis work is partially funded by the U.S. Department of Transportation, Pipeline and Hazardous Materials Safety administration (DOT PHMSA) and the Pipeline Research Council International, Inc. (PRCI).
机译：Battelle开发了双场磁通泄漏（MFL）技术，用于检测和表征管道的机械损伤。基本原理包括使用140至180奥斯特（11.1至14.3 kA / m）的高磁场和50至70奥斯特（4至5.6 kA / m）的低磁场。在高磁场水平下，磁通量泄漏信号主要受管壁几何形状变化的影响。在低磁场水平下，MFL信号是由于残余应力和冶金变化以及由于机械损坏和壁变薄导致的管道几何形状变化而引起的。由Battelle开发的去耦信号处理方法用于隔离由于冶金损伤和残余应力而导致的机械损伤信号的一部分，从而可以更清楚地区分凹痕特征的特性。去耦方法包括首先将高场信号按比例缩小到低场信号的电平，然后从低场信号中减去它。这会产生去耦信号，该信号主要受机械应力引起的残余应力和冶金变化的影响。rnRosen开发了一种工具来测试双场技术，并通过在直径30英寸的管道段中运行工具来评估工具的性能。工具本身由耦合在一起的三个独立模块组成：低场单元下游的高场单元，该低场单元位于卡尺臂单元的下游，后者用于检测和表征内径的减小。讨论了工具的通用设计和磁性设计，以及缩放算法。还讨论了在具有独立特征的凹痕的管段中进行拉力测试的结果。rn这项工作部分由美国运输，管道和危险材料安全署（DOT PHMSA）和国际管道研究委员会（Pipeline Research Council International）资助，公司（PRCI）。

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