PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000 – 000

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ScienceDirect

Procedia Structural Integrity 59 (2024) 74–81

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract This study is devoted to the determination of the effect of hydrogen concentration in metal C H on the residual durability N f of defected pipelines. Three different cases of defected pipes were considered, namely: pipe with longitudinal semi-elliptical crack at outer surface; pipe with longitudinal semi-elliptical crack at inner surface and pipe with circumferential semi-elliptical crack at inner surface. It has been shown that the presence of the crack-like defects in the pipelines is very dangerous from the point of view of their further reliable operation. This danger significantly increases with the increase of the hydrogen concentration in the metal. The increase of the danger of crack-like defects in the pipes may be expressed by the sequence: longitudinal semi-elliptical crack at outer surface – longitudinal semi-elliptical crack at inner surface – circumferential semi-elliptical crack at inner surface. The residual durability of defected pipe N f was chosen as the basic parameter for the assessment of its further serviceability. Thus, all defects detected in the pipeline after inspection can be compared with received data and on this base the expert conclusion for the evaluation of the potential risk of each defect can be made. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Effect of Hydrogen Concentration in Metal on Residual Durability of Defected Pipelines Ihor Dmytrakh, Andriy Syrotyuk*, Oksana Hembara, Mykhailo Hrynenko Karpenko Physico-Mechanical Institut, National Academy of Sciences of Ukraine, 5 Naukova Street, Lviv, 79060, Ukraine Abstract This study is devoted to the determination of the effect of hydrogen concentration in metal C H on the residual durability N f of defected pipelines. Three different cases of defected pipes were considered, namely: pipe with longitudinal semi-elliptical crack at outer surface; pipe with longitudinal semi-elliptical crack at inner surface and pipe with circumferential semi-elliptical crack at inner surface. It has been shown that the presence of the crack-like defects in the pipelines is very dangerous from the point of view of their further reliable operation. This danger significantly increases with the increase of the hydrogen concentration in the metal. The increase of the danger of crack-like defects in the pipes may be expressed by the sequence: longitudinal semi-elliptical crack at outer surface – longitudinal semi-elliptical crack at inner surface – circumferential semi-elliptical crack at inner surface. The residual durability of defected pipe N f was chosen as the basic parameter for the assessment of its further serviceability. Thus, all defects detected in the pipeline after inspection can be compared with received data and on this base the expert conclusion for the evaluation of the potential risk of each defect can be made. VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Effect of Hydrogen Concentration in Metal on Residual Durability of Defected Pipelines Ihor Dmytrakh, Andriy Syrotyuk*, Oksana Hembara, Mykhailo Hrynenko Karpenko Physico-Mechanical Institut, National Academy of Sciences of Ukraine, 5 Naukova Street, Lviv, 79060, Ukraine Keywords: pipeline; crack-like defects; fatigue crack growth rate; stress intensity factor; hydrogen concentration; residual durability. Keywords: pipeline; crack-like defects; fatigue crack growth rate; stress intensity factor; hydrogen concentration; residual durability.

* Corresponding author. Tel.: +38-032-263-1400; fax: +38-032-264-9427. E-mail address: asyrotyuk@gmail.com (Andriy Syrotyuk) * Corresponding author. Tel.: +38-032-263-1400; fax: +38-032-264-9427. E-mail address: asyrotyuk@gmail.com (Andriy Syrotyuk)

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.012