Heerema’s large semi-submersible crane vessel (SSCV) Sleipnir has eliminated Shell’s 10100 mT Brent Alpha jacket, which was positioned within the UK North Sea.

Located 186 km off the northeast coast of the Shetland Islands, the Brent Alpha platform comprised a topsides construction supported by a metal six-legged jacket standing in 140 m of water.

The Brent Alpha topside was eliminated in a single raise in June with the Pioneering Spirit vessel.

Brent Alpha was the third of 4 platforms, after Delta (2017) and Bravo (2019), to be decommissioned and faraway from the Brent oil and fuel discipline.

According to Heerema’s assertion on Wednesday, this single jacket raise breaks Sleipnir’s current document for lifting the 8100 mT Jotun-B jacket type July.

The Brent Alpha venture is Sleipnir’s fourth decommissioning job for this summer time.

The vessel will proceed to be busy within the North Sea earlier than swapping the most important lifts for one of many smallest with the set up of Dana Petroleum’s P11-Unity Platform later this yr.

So far, Sleipnir has eliminated and transported greater than 43900 mT of decommissioned offshore infrastructure for recycling over this summer time marketing campaign.  

For the Brent Alpha jacket removing, Sleipnir arrived on the Brent discipline positioned 186 km northeast of Scotland’s Shetland Islands on 23 July 2020.

It accomplished the venture by offloading the jacket onto the quayside on the AF Miljøbase decommissioning website in Vats, Norway on 11 August 2020.

Photo by Heerema Marine Contractors
Photo by Heerema Marine Contractors

During the venture, Heerema minimize jacket legs at 7.3m diameter utilizing a 288” Diamond Wire Cutting Tool developed alongside CUT UK, particularly for the Brent Alpha removing – the most important leg diameter to have been minimize this manner. 

Also, throughout this venture, Heerema eliminated and transported the conductors with the jacket, a completely new approach of decommissioning. The conductors had been suspended on a Heerema Fabrication Group constructed Conductor Hang-off Frame made for this venture. 

Now that the Brent Alpha jacket has been transported to Vats, it’ll finish its lifecycle by being over 97 per cent recycled.

Heerema’s Decommissioning Director, Jeroen van Oosten, famous that there have been fairly some technical challenges throughout this record-breaking raise; such because the slicing of the three x 288″ legs of the platform.

Photo by Heerema Marine Contractors
Photo by Heerema Marine Contractors

The put up GALLERY: Heerema’s Sleipnir vessel in record-breaking jacket raise for Shell appeared first on Offshore Energy.

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