PSI - Issue 59

Roman Hrabovskyy et al. / Procedia Structural Integrity 59 (2024) 112–119 Roman Hrabovskyy et al. / Structural Integrity Procedia 00 (2024) 000 – 000

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4. Conclusions The obtained results indicate that the evaluation of the fracture conditions using fracture mechanics approaches is more conservative than the alternative approach, which is based on the evaluation of the failure pressure of the defective pipe and, depending on the operation time, provides an additional margin of strength in the range of 20 – 33%, depending on the size gas pipeline The revealed residual concentration of hydrogen in the long-term operated 17H1S and 10H2BТ steels is not sufficiently decisive for the critical damage of the gas pipeline, obviously, the size of the defect and the operating pressure are dominant in the damage process. Assessment of the environmental consequences of accidents on main gas pipelines can be carried out after determining the areas of the damaging factors influence under various scenarios of the emergency events development and the amount of hazardous substances is the main preparatory step for calculating the environmental consequences of accidents. References Babadzhanova, O.F., Pavlyuk, Yu.E., Sukach, Yu. H., 2011. Factors conditioning the fire hazard of the linear part of the main gas pipeline. Fire Security 2011, 27 – 34. Bolzon, G., Gabetta, G., Nykyforchyn, H., 2021. Degradation assessment and failure prevention of pipeline systems, in “ Lecture Notes in Civil Engineering ”. In: Bolzon, G., Gabetta, G., Nykyforchyn, H. (Eds.). Springer Nature, 102, pp. 252. Capelle, J., Dmytrakh, I., Pluvinage, G., 2009. Hydrogen effect on local fracture emanating from notches in pipeline from steel API X52. Strength of Materials 41, 493 – 500. Dmytrakh, I. M., Syrotyuk, A.M., Leshchak, R. L., 2020. Fracture and Strength of Pipe Steels in Hydrogen-Containing Environments. Prostir-M, Lviv, pp. 222. Dmytrakh, I.M., 2011. Corrosion fracture of structural metallic materials: effect of electrochemical conditions in crack. Strain 47, 427 – 435. Dmytrakh, I.M., Leshchak, R.L., Syrotyuk, A.M., 2019. Influence of sodium nitrite concentration in aqueous corrosion solution on fatigue crack growth in carbon pipeline steel. International Journal of Fatigue 128, 105192. Dmytrakh, I.M., Syrotyuk, A.M., Leshchak, R.L., 2023. Special diagram for hydrogen effect evaluation on mechanical characterizations of pipeline steel. Journal of Materials Engineering and Performance. Dmytrakh, І.М., Syrotyuk, A.М., Leshchak, R.L., 2018. Specific features of the deformation and fracture of low -alloy steels in hydrogen containing media: influence of hydrogen concentration in the metal. Materials Science 54, 295 – 308. Dmytrakh, І.М., Syrotyuk, А.М., Leshchak, R.L., 2021. Specific features of electrochemical hydrogenation of low -alloy pipeline steel in a model solution of ground water. Materials Science 57, 276 – 283. DNV-RP-F1001, 1999. Corroded pipelines. Gas pipeline incidents, 2011. 8 th Report of the European Gas Pipeline Incident Data Group. Groningen: EGIG. GOST 25.506 – 85, 1985. Calculations and strength tests. Methods of mechanical testing of metals. Determination of crack resistance characteristics (fracture toughness) under static loading, Standard. Kryzhanivs’kyi, E. I., Hrabovs’kyi, R. S., Mandryk, O. M., 2013. Estimation of the serviceability of oil and gas pipe lines after long-term operation according to the parameters of their defectiveness. Materials Science 49, 17 – 123. Mandryk, O. M., 2015. Analysis of environmental consequences of accidents on main gas pipelines during their long-term operation. Naukovo tekhnichnyi Zhurnal 1, 25 – 30. N B V.2.3.-21:2008, 2008. Guidelines for determining the residual strength of main pipelines with defects, Technical Requirements of Ukraine. Newman, J. C., Raju, I.S., 1980. Stress-Intensity Factors for Internal Surface Cracks in Cylindrical Pressure Vessels. Transactions of the ASME: Journal of Pressure Vessel Technology 102, 342 – 349. Panasyuk, V. V., Dmytrakh, I. M., Toth, L., Bilyi, O. L., Syrotyuk, A. M., 2014. A method for the assessment of the serviceability and fracture hazard for structural elements with cracklike defects. Materials Science 49, 565 – 576. Pipeline safety, 2003: Pipeline integrity management in high consequence areas (gas transmission pipelines), pp. 4315. Rice, J. R., 1968. A path independent integral and the approximate analysis of strain concentration by notched and cracks. Journal of Applied Mechanics 35, 287 – 298. Syrotyuk, А.М., Dmytrakh, I.M., 2014. Methods for the evaluation of fracture and strength of pipeline steels and structures u nder the action of working media. Part 1. Influence of the corrosion factor. Materials Science 50, 324 – 339. Syrotyuk, А.М., Dmytrakh, I.M., 2015. Methods for the evaluation of fracture and strength of pipeline steels and structures u nder the action of working media. Part 2. Influence of hydrogen-containing media. Materials Science 50, 475 – 487.