Sleipnir has successfully removed the 8,100 mT Jotun-B jacket for client Vår Energi in the Norwegian North Sea, the company said on July 20. The platform was installed in 1998 by Heerema’s Thialf, who returned to the Jotun Field last year to remove the topsides and conductors—demonstrating the circularity of Heerema’s involvement in the lifecycle of these now retiring platforms.

For the jacket removal, Sleipnir arrived at the Jotun Field located 200 km west of Stavanger on 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.

Heerema
(Source: Heerema)
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The decommissioning work was completed safely, sustainably, and one day ahead of schedule; the result of excellent collaboration between Heerema and Vår Energi. 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 80mm wall thickness were cut subsea, the largest ever done in this way. Additionally, Heerema fabricated a 40 m long spreaderbar within 2mm 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 more than 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%.

“We set records to break them, and we are proud to have worked alongside our client Vår Energi to complete the Jotun-B removal with mighty Sleipnir safely, sustainably, and in the shortest possible time,” Koos-Jan van Brouwershaven, Heerema’s CEO, said.

It is essential to note that all companies involved followed the strict government guidelines to protect their workforces during the ongoing COVID-19 outbreak. For Heerema, safeguarding our employees and those who work alongside Heerema is always the top priority.

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