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首页> 外文期刊>NDT & E international >Assessment of wall thinning in insulated ferromagnetic pipes using the time-to-peak of differential pulsed eddy-current testing signals
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Assessment of wall thinning in insulated ferromagnetic pipes using the time-to-peak of differential pulsed eddy-current testing signals

机译：使用差分脉冲涡流测试信号的峰值时间评估绝缘铁磁管道的壁变薄

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摘要

Pulsed eddy current testing (PECT) is a powerful candidate for the detection of wall thinning of insulated ferromagnetic pipes in petrochemical and power generation plants. The main purpose of this study is to find an efficient and easy-to-use signal feature for the assessment of wall thinning. Analytical modeling for a PECT probe over the insulated piping system is performed and its result is verified by experimental test. Two time-related features, the peak value and the time-to-peak, are found in the differential signal obtained by subtracting the test signal from the reference signal. The time-to-peak is superior to the peak value due to its linear variation with wall thickness. Influences of various conditions in practical testing on the PECT signal are investigated. Results show that the time-to-peak is independent of the insulation thickness and the probe lift-off. Robustness of time-to-peak to probe configuration is also validated by employing three probes of different dimensions and structures. To determine the linear range of time-to-peak with amount of wall thinning, differential signals based on different reference thicknesses are examined. Results show that the time-to-peak only keeps linear for the relative wall thinning less than 60%, but still can be effectively used for calibration purpose in periodical in-service inspection of insulated pipeline.
机译：脉冲涡流测试（PECT）是检测石化和发电厂中绝缘铁磁管道壁变薄的有力候选者。这项研究的主要目的是找到一种有效且易于使用的信号特征，以评估壁变薄。对绝缘管道系统上的PECT探针进行了分析建模，并通过实验测试验证了其结果。在通过从参考信号中减去测试信号而获得的差分信号中，发现了两个与时间相关的特征，即峰值和达到峰值的时间。峰值时间由于其随壁厚的线性变化而优于峰值。研究了实际测试中各种条件对PECT信号的影响。结果表明，达到峰值的时间与绝缘层的厚度和探针的剥离无关。通过使用三种不同尺寸和结构的探头，也可以验证达到探头配置所需的峰值时间。为了确定到达峰值时间与壁变薄量的线性范围，需要检查基于不同参考厚度的差分信号。结果表明，峰值时间仅在相对壁厚小于60％时才保持线性，但仍可有效地用于绝缘管道的定期在役检查中的校准目的。

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  • 来源
    《NDT & E international》 |2012年第2012期|p.24-29|共6页
  • 作者

    Zhiyuan Xu; Xinjun Wu; Jian Li; Yihua Kang;

  • 作者单位

    State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, PR China;

    State Engineering Research Center of Manufacturing Equipment Digitization, Huazhong University of Science and Technology, Wuhan 430074, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pulsed eddy current testing; insulated pipes; wall thinning; thickness evaluation;

    机译：脉冲涡流测试;绝缘管;壁变薄厚度评估;

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