Abstract
The model describing the corrosion-mechanical fracture of the underground gas pipeline with semi-elliptical external surface crack is developed taking into account the intensification of crack growth in the pipe steel 17H1S by diffusible hydrogen. The model is grounded on the energy approach to fracture combined with the hydrogen accelerated soil corrosion cracking mechanism. The formula for the soil corrosion rate is derived as the sum of two components: the rate of regular soil corrosion due to contact of steel with the soil, and the term characterizing its acceleration by hydrogen. Corresponding mathematical model (differential equation with initial and final conditions) is built up to determine the residual lifetime of a pipe of gas pipeline subjected to hydrogenation from the transported gas, soil corrosion, long term sustained and transient loadings caused, respectively, by gas pressure in the pipe and by start/stop valve operations. As a result of model implementation, the pipe residual lifetimes are evaluated considering pipe hydrogenation from the inner surface, soil corrosion at the outer surface as well as transient loading. From the analysis of results, it is concluded that pipe wall hydrogenation, as well as transient loading, lead to significant acceleration of corrosion-mechanical crack growth in the pipe, and thus, reduce its residual lifetime.
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This research has been supported by the NATO in the Science for Peace and Security Programme under the Project G5055.
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Shtoyko, I., Toribio, J., Kharin, V., Hredil, M. (2021). Determination of the Residual Lifetime of Gas Pipeline with Surface Crack Under Internal Pressure and Soil Corrosion. In: Bolzon, G., Gabetta, G., Nykyforchyn, H. (eds) Degradation Assessment and Failure Prevention of Pipeline Systems. Lecture Notes in Civil Engineering, vol 102. Springer, Cham. https://doi.org/10.1007/978-3-030-58073-5_5
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