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Diagnostics of Hydrogen Macrodelamination in the Wall of a Bent Pipe in the System of Gas Mains

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We study the intense hydrogen-induced delamination in the wall of a bent branch pipe after long-term operation at the gas-compressor station of the system of gas mains. The factors playing the key role in the formation of this delamination are analyzed. It is shown that the abnormal readings of a thickness meter and a sharp decrease in the hardness and plasticity of steel are the diagnostic signs of this phenomenon. It was discovered that the degree of degradation of steel of the pipe bent is higher as compared with the straight section of the pipe regardless of their tension or compression. We establish the limitations for the use of the relative elongation and relative narrowing as characteristics of plasticity for the metal of the pipe wall with intense delamination.

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Authors and Affiliations

  1. “L’vivs’ka Politekhnika” National University, Lviv, Ukraine

    L. E. Kharchenko, O. E. Kunta & Z. A. Duryahina

  2. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    O. I. Zvirko

  3. “L’vivtransgaz” Administration of Gas Mains, Lviv, Ukraine

    R. S. Savula

Authors
  1. L. E. Kharchenko
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  2. O. E. Kunta
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  3. O. I. Zvirko
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  4. R. S. Savula
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  5. Z. A. Duryahina
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Corresponding author

Correspondence to L. E. Kharchenko.

Additional information

Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 51, No. 4, pp. 84–90, July–August, 2015.

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Kharchenko, L.E., Kunta, O.E., Zvirko, O.I. et al. Diagnostics of Hydrogen Macrodelamination in the Wall of a Bent Pipe in the System of Gas Mains. Mater Sci 51, 530–537 (2016). https://doi.org/10.1007/s11003-016-9872-x

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  • DOI: https://doi.org/10.1007/s11003-016-9872-x

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