Serviceability criterion for hydrogen transmission pipeline

This study addresses the development of serviceability criterion for the transmission of hydrogen through existing natural gas pipeline infrastructure. Given the unique properties of hydrogen, including its potential to cause hydrogen embrittlement and impact material integrity, assessing the suitability of current pipelines is critical. The research focuses on evaluating material compatibility, structural integrity, and safety requirements under operational pressures and conditions specific to hydrogen transport. The criterion is based on determining the fracture toughness of hydrogen pre-charged specimens at a low loading rate of specimens with cracks and comparing the obtained values with the maximum permissible ones, taking into account operational conditions and the possible presence of crack-like defects. This approach aims to facilitate the sustainable repurposing of gas pipelines, supporting the transition to a hydrogen economy while maintaining safety and performance standards.