Fracture mechanics testing of materials for gas pipelines to evaluate their suitability for hydrogen use
Topic: Infrastructure
Details
Converting electricity into hydrogen can significantly increase the share of usable renewable energy, as it decouples the amount of energy generated from the amount currently consumed and allows excess energy to be stored. A cost-effective way to quickly establish an effective and functional infrastructure for hydrogen transport would be to convert existing pipelines, which are currently used for natural gas transport, to transport hydrogen. For hydrogen transport in the German gas network, it is necessary to assess the pipelines for hydrogen compatibility and to adapt the DVGW regulations. To date, the evaluation of steel components for suitability for use with up to 100% hydrogen has only been described in the American standard ASME B 31.12 [1]. It therefore makes sense to adopt the evaluation method in accordance with ASME B 31.12 and incorporate it into the relevant DVGW regulations. However, to verify the steels currently in use in Germany, it would be necessary to conduct fracture mechanics tests—at least on a random sample basis—under a pressurized hydrogen atmosphere. The fracture mechanics parameters determined in these tests should be compared with the results underlying ASME B 31.12 to validate their applicability to the steels used in Germany. In this context, a project was initiated with the partners OGE, TÜV NORD, TÜV SÜD, and the MPA at the University of Stuttgart, which is being continued by the DVGW as part of a research project. This technical report details the initial fracture mechanics tests conducted on pipeline materials in a hydrogen atmosphere and provides a comparison with existing data.
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