Abstract
Comparison of mechanical (characteristics of strength, reduction of area and elongation, impact strength, hardness, fracture toughness), corrosion (corrosion rate and electrochemical parameters), corrosion-mechanical (stress corrosion cracking and hydrogen embrittlement) properties and parameters of hydrogen behaviour in the oil and gas pipelines steels in the as-received state and after 28–40 years of service are presented in the paper. Transported hydrocarbons serve as a hydrogen source and the hydrogen accumulates in the pipe metal during its use. This cause’s in-bulk material diffused damage due to the presence of hydrogen traps created during service. The analysis of a change of the mentioned characteristics together with the results of hydrogen permeation and vacuum hydrogen extraction measurements indicate considerable “in-bulk” material degradation of main pipeline steels after long term service and the essential role of hydrogen in these processes. Therefore the monitoring of surface defects induced by corrosion and mechanical damage is insufficient for safe service if one does not take into account possible degradation of in-bulk material properties. It is possible to monitor in-bulk material property changes by measurements of electrochemical characteristics and it opens up possibilities for an application of electrochemical methods for diagnostics of in-service degradation.
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Nykyforchyn, H.M., Lunarska, E., Zonta, P. (2011). Degradation of Properties of Long Term Exploited Main Oil and Gas Pipelines Steels and Role of Environment in This Process. In: Bolzon, G., Boukharouba, T., Gabetta, G., Elboujdaini, M., Mellas, M. (eds) Integrity of Pipelines Transporting Hydrocarbons. NATO Science for Peace and Security Series C: Environmental Security, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0588-3_5
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DOI: https://doi.org/10.1007/978-94-007-0588-3_5
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