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Evaluation of the residual lifetime of a section of a main gas pipeline after long-term operation

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The soil environment of an emergency section of a main gas pipeline is characterized as “near-neutral” (pH < 8) with middle or, in some cases, even high (more than 0.3 mm/year) corrosion activity and can be modeled by the NS4 solution. Long-term operation (23 years) decreases mainly the static crack resistance of X60 and X70 steels, whereas hydrogenation under the potential of cathodic protection sharply increases their susceptibility to stress corrosion fracture under both static and cyclic loading. The X70 steel is more sensitive to the negative influence of operation and hydrogenation as compared with X60 steel. We have evaluated the residual lifetime of the section of the “Urengoi–Pomary–Uzhgorod” main gas pipeline with regard for hydrogenation of the pipeline wall.

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Correspondence to O. V. Hembara.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 48, No. 2, pp. 103–110, March–April, 2012.

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Andreikiv, O.E., Hembara, O.V., Tsyrul’nyk, O.T. et al. Evaluation of the residual lifetime of a section of a main gas pipeline after long-term operation. Mater Sci 48, 231–238 (2012). https://doi.org/10.1007/s11003-012-9497-7

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