Opportunity and Risk in Repurposing Natural Gas Pipeline Network for Hydrogen Transport

Studies investigated the behavior of pipeline steel in hydrogen environment but presenting the natural gas pipeline network as a viable solution for hydrogen transportation is still debatable. The current review presents the evaluation of the available research on the hydrogen-induced degradation of pipeline steel. The hydrogen-induced degradation of pipeline steels under electrochemical charging and/or exposure to hydrogen gas can be attributed to variables, namely, gas composition, hydrogen pressure, loading conditions, temperature variations, welding type, and technique and the inhibitors used. Given the outcomes, it can be inferred that the current pipeline infrastructure can present a viable and cost-effective option for blending hydrogen in existing natural gas pipelines. However, it is highly suggested that future researchers ought to prioritize the investigation of fatigue behavior about parental cracks and dents, gouge development, corrosion effects, as well as weldments with various flaws.