In 2018 RaKon was requested to contribute when a new riser was installed at Troll A. The main task for RaKon was grouting of the seal-tube annulus, with the purpose to set up an extra barricade against the seawater, transfer power and give corrosion protection.  The grout operation found place inside of the riser shaft at 300 meter water depth. Meaning that we had a water pressure from the sea water of around 30 bar to grout against.

The operation was planed in detail, and method, equipment and grout material was proven in a full-scale test.

The operation was successfully performed in march 2020.

This was not the first time for RaKon. We did the same job in 2012 – Last time a riser was implemented at Troll A.