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Heerema achieves largest single lift jacket removal

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Oilfield Technology,

Heerema has announced that in the Norwegian North Sea the semi-submersible crane vessel (SSCV) Sleipnir has successfully 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.

Heerema achieves largest single lift jacket removal

For the jacket removal, Sleipnir arrived at the Jotun Field located 200 km west of Stavanger on 11 July, and completed the project by offloading the jacket onto the quayside at the AF Miljøbase decommissioning site in Vats, Norway on 16 July.

The decommissioning work was completed safely, sustainably, and one day ahead of schedule. The entire removal scope in the Jotun Field was completed in only four days.

During this project, skirt piles with diameters 2.7 m and 80 mm wall thickness were cut subsea, the largest ever done in this way. Additionally, Heerema fabricated a 40 m long spreaderbar within 2 mm tolerance for a tight, but perfect fit.

Sleipnir is the world’s most sustainable SSCV, and during the project, the vessel performed the full removal operations while running on emission-reducing LNG fuel. 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%.

Image courtesy of Heerema

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