Deformation behavior of the long-term exploited pipelines in soil electrolyte imitates

Abstract

Pipeline transportation of hydrocarbon energy is one of the cheapest and most environmentally friendly transport methods. In the context of the green energy transition and implementing ambitious plans to reduce carbon emissions. The issue of optimal use of the released pipeline capacities in the future arises. One promising option is to use existing pipeline networks to transport green hydrogen and methane-hydrogen mixtures. In the process of long-term operation, the pipeline steel is subject to defect accumulation, which causes degradation of physical and mechanical properties.  The influence of operational degradation on the resistance to deformation of 19G and 17GS pipe steels in soil electrolytes of different chemical compositions was studied. It is shown that the strain growth in corrosive environments can be up to 30%, which will lead to an increase in operational risks, especially in areas that run in structurally unstable soils. At the same time, the absolute values of the strain increase are in the range of 3...7%, and are not very dangerous, since they are within the range of tolerable damage. In the future, it will be advisable to study in more detail the behavior of pipe steels after long-term operation in the environment of hydrogen gas and methane-hydrogen mixtures to assess the prospects for using existing pipelines for their transportation.