Dutch firm Hereema Marine Contractors (HMC) has broken its own record a single jacket lift.
The oil and gas contractor’s Sleipnir offshore crane, the largest of its kind in the world, succesfully removed Shell’s 10100 mT Brent Alpha jacket in the northern North Sea.
The jacket was then offloaded at the AF Miljøbase decommissioning site in Vats in Norway – 97% of it will go on to be recycled.
This project is the semi-submersible’s fourth decommissioning job of the summer.
During the project, HMC cut the jackets 7.3m diameter legs using a 288” diamond wire cutting tool that was specifically developed for the Brent Alpha.
It’s the largest leg diameter to have been cut this way.
Conductors were also removed and transported with the jacket, a new way of decommissioning.
So far Sleipnir has safely removed and transported more than 43900 mT of decommissioned offshore infrastructure for recycling over this summer campaign.
The vessel, which has two cranes capable of lifting 10,000 metric tonnes each and a deck area 220 metres long, set the record for the largest single lift jacket last month when it removed the 8100 mT Jotun-B.
HMC’s decommissioning Director, Jeroen van Oosten, said “There were some technical challenges during this record-breaking lift such as the cutting of the 3 x 288″ legs of the platform. However, due to the excellent preparation and perseverance during execution, we successfully delivered this jacket safely and sustainably to Vats for disposal. An outstanding achievement for all involved.”