Hydrogen embrittlement and who pays to keep the pipeline running

Hydrogen embrittlement is why steel fit for natural gas is not always fit for hydrogen. A study from South China University of Technology, in the Journal of Materials Science, describes how to contain the effect in austenitic stainless steels: precipitates at grain boundaries block diffusion, with the strongest effect at 90 degrees to the flow.

Material choice sets the maintenance bill for decades. The European Hydrogen Backbone, in its April 2022 infrastructure vision covering 28 countries, estimates operation and maintenance of hydrogen pipelines at 0.9% of capex per year, on 1.5 to 2.8 million euros per kilometre for new pipe and 0.3 to 0.5 million for repurposed pipe.

That figure covers scheduled inspection, not the early replacement of an embrittled section, which lands as unbudgeted capital and downtime. The repost headline says pipes; the study covers austenitic stainless steels, used in components and liners rather than carbon steel pipe.

The gain arrives when the mechanism becomes a specification and testing criterion. Until then the project protects itself with margin; after that, the same protection may cost less steel.