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<p>Using the basic parameters of fatigue crack growth resistance of pipeline steel, an analytical approach to evaluating the residual life <i>N</i><sub><i>fc</i></sub> of a&#xa0;defective pipeline is proposed. This approach considers the effects of the internal pressure&#xa0;(<i>p</i>) of the hydrogen-containing operating environment, defect geometry (semi-axes ratio (<i>a</i>/<i>c</i>) of semi-elliptical internal crack), and the total hydrogen concentration in the metal (<i>C</i><sub>H</sub>). The experimental fatigue crack growth resistance parameters (the threshold ∆<i>K</i><sub><i>th</i></sub> and critical ∆<i>K</i><sub><i>fc</i></sub> stress intensity factor ranges), and the Paris law constants&#xa0;<i>A</i> and&#xa0;<i>n</i>, were approximated by analytical relations as functions of <i>C</i><sub>H</sub>. This enabled the derivation of closed-form dependences for the residual life <i>N</i><sub><i>f</i></sub> without numerical simulation. A&#xa0;parametric analysis over a&#xa0;wide range of pressures&#xa0;<i>p</i>, axis ratios <i>a</i>/<i>c</i>, and <i>C</i><sub>H</sub> values was carried out, allowing the assessment of their influence on the residual life of the structural element of the pipeline. The obtained analytical relations can be used for engineering assessment of the safe service life of pipelines for the transportation of hydrogen-containing agents.</p>

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Analysis of the residual life of a defective pipeline for transporting hydrogen-containing environments

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • O. Ya. Chepil,
  • I. M. Soviak,
  • A. M. Syrotyuk

摘要

Using the basic parameters of fatigue crack growth resistance of pipeline steel, an analytical approach to evaluating the residual life Nfc of a defective pipeline is proposed. This approach considers the effects of the internal pressure (p) of the hydrogen-containing operating environment, defect geometry (semi-axes ratio (a/c) of semi-elliptical internal crack), and the total hydrogen concentration in the metal (CH). The experimental fatigue crack growth resistance parameters (the threshold ∆Kth and critical ∆Kfc stress intensity factor ranges), and the Paris law constants A and n, were approximated by analytical relations as functions of CH. This enabled the derivation of closed-form dependences for the residual life Nf without numerical simulation. A parametric analysis over a wide range of pressures p, axis ratios a/c, and CH values was carried out, allowing the assessment of their influence on the residual life of the structural element of the pipeline. The obtained analytical relations can be used for engineering assessment of the safe service life of pipelines for the transportation of hydrogen-containing agents.