ExpectedOutcome:
In its strategic vision for a climate-neutral EU (to meet the carbon neutrality in 2050) presented by the European Commission on 28th November 2018, the share of hydrogen in Europe’s energy mix is projected to grow from the current less than 2% to 13-14% by 2050. In order for hydrogen to claim such position in the energy mix and as explicitly mentioned in the EU Hydrogen Strategy[1], it is essential that hydrogen becomes an intrinsic part of an integrated energy system. Hydrogen will have to be used for daily or seasonal storage providing buffering functions thereby enhancing security of supply in the medium term. The strategy also calls for an EU-wide logistical infrastructure that needs to be developed in order to transport hydrogen from areas with large renewable potential to demand centres across Europe. Consequently, a pan-European grid will have to be established.
To do so there is significant energy system benefit in using existing natural gas assets across Europe, as they have large seasonal storage potential and can also readily manage large swings in daily demand. To supply this hydrogen, European gas grid operators aim to increase the content of hydrogen blends into natural gas from in existing gas grids (including transmission and distribution gas networks but also by extension their connections to hydrogen production facilities and new end users). In parallel, European gas grid operators also work on repurposing existing assets to transport 100% hydrogen.
Considering these challenges, project results are expected to contribute to all of the following expected outcomes:
Project results are expected to contribute to all of the following objectives of the Clean Hydrogen JU SRIA:
Former public bibliographic results and testing programs (e.g. NaturalHY[2], HYready[3], MultiHy[4] or Higgs[5] projects) have identified an embrittlement effect on steel grid materials used for pipes or network equipment, directly linked to the partial pressure of hydrogen (commonly expressed in terms of percentage of hydrogen in the total volume of gas at a specific pressure). However, this embrittlement effect on the various metallic materials used on the gas distribution networks (steel, but also cast iron, copper, lead…) has not been documented to date, as most existing testing programs have investigated non-metallic materials only. Therefore, there is a strong need to document the effect of hydrogen on metallic materials at low pressure, taking into account the great diversity of existing networks across the European Union, in terms of material grades used, building protocols (e.g. welds) or day-to-day current and future operational parameters (e.g. pressure level).
All types of metallic materials (steel, cast iron, copper, brass, lead, aluminium) or operational parameters representative of the functioning of the distribution networks have not been fully studied. All gas grids characteristics and load case scenarios should be covered to better assess the lifespan of existing infrastructure.
Currently different standards can be used for the design of metallic components (ISO 11114-4, ASME B31.12) or to assess their mechanical properties in the presence of hydrogen (ANSI/CSA CHMC 1, ASTM G142). This wide range of standards and the lack of commonly agreed mechanical guidelines are slowing down the definition of harmonised criteria to assess hydrogen-readiness of European gas networks.
Proposals should therefore focus on all non-steel metallic materials constitutive of Distribution networks (such as cast iron, copper, brass, lead, aluminium etc.).
In particular proposals should:
Following the testing activities proposals should make available a database of gas grid metallic materials’ behaviour in the presence of hydrogen associated with network operating conditions, assessing the compatibility of vintage and new gas pipes. There should also be a plan that ensures the that the database is updated after the project is finished with future testing results.
Projects should also identify acceptance criteria including the allowed size of defects, depending on the pressure and hydrogen concentration.
Proposals should ensure regular knowledge sharing with other topics devoted to hydrogen injection into gas grids that will require those tests’ results, and especially HORIZON-JTI-CLEANH2-2022-02-02, HORIZON-JTI-CLEANH2-2022-05-03 and HORIZON-JTI-CLEANH2-2022-05-04.
At least two different research institutions should be included in the consortium in order to ensure the comparability of the testing results.
Proposals are expected to contribute towards the activities of Mission Innovation 2.0 - Clean Hydrogen Mission. Cooperation with entities from Clean Hydrogen Mission member countries, which are neither EU Member States nor Horizon Europe Associated countries, is encouraged (see section 2.2.6.8 International Cooperation).
Activities are expected to start at TRL 3 and achieve TRL 5 by the end of the project.
The conditions related to this topic are provided in the chapter 2.2.3.2 of the Clean Hydrogen JU 2022 Annual Work Plan and in the General Annexes to the Horizon Europe Work Programme 2021–2022 which apply mutatis mutandis.
[1]https://ec.europa.eu/energy/sites/ener/files/hydrogen_strategy.pdf
[2]https://cordis.europa.eu/project/id/502661/es
[3]https://www.gerg.eu/project/hydrogen/
[4]https://cordis.europa.eu/project/id/263335
[5]https://www.clean-hydrogen.europa.eu/projects-repository_en