Heerema’s SSCV Sleipnir removed the 8100 mT Jotun-B jacket for Vår Energi. The platform was installed in 1998 by Heerema's Thialf, who returned to the Jotun Field last year to remove the topsides and conductors.
For the jacket removal, Sleipnir arrived at the Jotun Field located 200 km west of Stavanger on Friday, July 11, and completed the project by offloading the jacket onto the quayside at the AF Miljøbase decommissioning site in Vats, Norway on Thursday, July 16.
The decommissioning work was completed one day ahead of schedule, as the entire removal scope in the Jotun Field rook place in only four days.
During this project, skirt piles with diameters 2.7m and 80mm wall thickness were cut subsea, the largest ever done in this way, the company said.
Meanwhile, the vessel performed the full removal operations while running on LNG. By using LNG, Sleipnir reduces CO2 emissions by 25%, reduces NOx emissions by 92%, reduces SOx emissions by 99%, and Particulate Materials by <99% compared to traditional Marine Gas Oil crane vessels.
Now that the Jotun-B jacket has been safely and sustainably transported to Vats, it will end its lifecycle by being recycled up to 99%.