CANDHy aims to assess the integrity and tolerance of non-steel metallic natural gas distribution networks in long-term operational conditions delivering H2/natural gas (NG) admixtures (up to 100 vol% H2). To achieve this result, gas operators, regulators, authorities and end-users confidence must be enhanced through consolidated and exhaustive scientific data, obtained through harmonized guidelines. Those guidelines will provide the necessary input to prenormative actions conducted through European organisations and will enable a smooth interconnection between gas grids.
In order to investigate the readiness of the natural gas distribution grid, CANDHy has stablished the following specific objectives:
-Performing a full review of the state of art of i) the European gas distribution grids and ii) the standards and codes on testing regarding material compatibility with hydrogen and iii) hydrogen embrittlement mechanisms, to collect information for the development of useful testing protocols to derive the properties of the classes of materials studied in CANDHy in their relevant operating conditions.
-Design, development and performance of the experimental campaign to test the most relevant non-steel metallic materials found in CANDHy under different hydrogen levels to assess their tolerance towards this gas at operating conditions usual for the distribution grid.
-Documenting and analysing the effect of hydrogen gas on the non-steel metallic materials tested in the experimental campaign previously explained.
-Developing models for the prediction of hydrogen embrittlement mechanisms.
-Proposing guidelines, procedures and areas of development to support future standardization related with the testing and qualification of materials of the distribution network in the presence of H2/NG blends
-Developing a technical database for hydrogen compatibility of metals as a tool to aid in the selection of materials for use in hydrogen gas distribution
