Hydrogen Related Issues at Hydrogen Transport via Existing Gas Pipelines

Abstract

One of the primary technical challenges in repurposing gas pipelines for hydrogen transport is ensuring material compatibility. In this study, the influence of absorbed hydrogen on the stressed state of the metal is investigated, and the role of hydrogen-induced stress in damage to pipeline steel is analysed. Hydrogen-induced stress in steel specimens preloaded in the elastic and plastic region is assessed using the developed technique. A change in the stress state of the steel specimen as a response to hydrogen charging and desorption depended on the type of preliminary deformation in the elastic or plastic region and hydrogen charging intensity. The role of hydrogen in the implementation of strain ageing of steels, as well as in the formation of pores and delaminations during long-term operation, is considered.