SUBSTITUTION OF THE LIMIT STATE CRITERIUM OF GAS PIPELINE STEEL DURING THEIR REPROFILING FOR HYDROGEN

Abstract

Long-term operation of natural gas transmission pipelines causes a significant decrease in the initial mechanical characteristics of pipeline steels. The influence of operating conditions of hydrogen uptake by natural gas pipeline steels on their degradation in terms of resistance to brittle fracture is analyzed. The criterion for achieving a limit state of steels in terms of crack growth resistance considering the operational degradation, hydrogen charging conditions, gas pressure in the pipe and the presence of crack-like defects is substantiated. The obtained results can be used for assessment the serviceability of gas transit pipeline steels reprofiling for gaseous hydrogen transportation.