This project builds on the development of tape and spray solution using graphene nanoplatelets in EPDM to mitigate SF6 leakage, initiated by previous NGET project. The aim is to create elastomer nanocomposites that address the leakage challenges associated with SF6 alternatives, particularly gas mixtures. These material systems will be engineered to possess similar permeability to all gas components within a mixture and provide excellent barrier properties at various operating temperatures. The key objectives are: (1) to develop material systems that can seal air mixture, C4F7N with CO2, or N2 as a binary mixture and/or tertiary mixture including the addition of O2; (2) to validate these material systems through permeability testing at different temperatures; and (3) to validate the tape solution in a representative scaled demonstrator system.

Benefits

Environmental: SF6 is the largest controllable element of NGET’s direct emissions at around 285,000 tonnes CO2 equivalent in 2018/19. This project will support the delivery of the NGET’s corporate target of a 50% reduction in SF6 emission reductions compared with its 2019 level.

Technology: This project will boost the development of the novel sealing solutions for in-service emergency repair. The technology and materials know-how developed are readily transferable to new gasket for new equipment in wide ranging sectors.

Policy: In the new F-gas regulation 2024, production of virgin SF6 will be banned in Europe by 2035. This will inevitably cause a reduction of virgin SF6 production from gas manufacturers pre-2035. Better sealing technology will minimise the need to purchase new/recycled SF6. 

Economics: The RIIO Insulation and Interruption Gas Emissions Output Delivery Incentive (IIGIt) can result in either financial incentives or penalties depending on SF6 related emissions above or below the baseline leakage across the total SF6 inventory.