In the context of the decarbonisation of the European energy systems, the injection of hydrogen produced from green electricity into the natural gas transport and distribution networks is a highly discussed option. However, the hydrogen content in the gas mixture is likely to reduce the mechanical properties of metallic components. This is established as hydrogen embrittlement (HE). Hence, it is crucial to elaborate a full understanding of the consequences resulting from the injection of hydrogen on gas distribution networks.

The report D2.4 from the THyGA project focuses on the non-combustion related aspects of injecting hydrogen in the gas distribution networks within buildings. This includes hydrogen embrittlement of metallic materials, its chemical compatibility with other materials and the investigation of its propensity towards leakage.