Key technologies for integrity management of hydrogen-blended gas pipelines

In order to ensure the safe operation of hydrogen-blended gas pipelines and maintain their structural and functional integrity, it is urgent to establish an integrity management plan for the hydrogen-blended gas pipelines. Based on the characteristics of hydrogen-blended gas pipelines, the key technologies for risk-based hydrogen-blended gas pipeline integrity management were proposed by drawing on the experience of conventional gas pipeline integrity management, mainly including data collection and integration, identification of key areas, quantitative risk assessment, risk control measures, and effectiveness evaluation. Meanwhile, the parameter weights, evaluation criteria and control measures that need to be corrected in each key technology were pointed out to prevent the occurrence of failure modes such as hydrogen corrosion, hydrogen embrittlement and hydrogen induced cracking. Thus, a digital system for integrity management of hydrogen-blended gas pipelines was developed based on the above five key technologies, to provide a systematic solution for the integrity management of hydrogen-blended gas pipelines.