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Two world records have been claimed for the lift and load-in of a 24,000 tonne oil platform topside for decommissioning.
Offshore contractor Allseas from the Netherlands used its giant twin-hull vessel Pioneering Spirit for what was claimed as the heaviest single lift ever, to remove Shell UK’s Brent Delta from its three leg concrete base. The platform was lifted on 28 April before being towed towards Hartlepool, on the north East coast of England. It was then transferred to a barge for transport into port where international heavy lift and transport specialist Mammoet claimed a world record for its load-in operation to get it ashore.
Mammoet successfully concluded the load-in of Shell’s Brent Delta topside at the ABLE UK dismantling yard in Hartlepool (UK). With a weight of more than 24,000 tons, the structure was the heaviest topside to have ever been brought onto shore in one piece. Because no load-in had ever been conducted on such a scale, Mammoet’s client, Allseas, needed a specialist company that could carry out this operation, which was record-breaking in multiple ways.
Watch the Video "SKID IN TIMELAPSE Shell Brent Delta Arrival at ABLE Seaton Port"
Brent Delta
Shell’s Brent Delta is the largest topside that has ever been retrieved for decommissioning. For the last 40 years, the topside has served as a factory, a processing plant and as a hotel for 160 Shell staff members. Bringing the more than 24,000 ton topside safely back onto shore was a complex operation that required more than five years preparation. Within this operation, Mammoet was responsible for the final stage of the operation: bringing the topside onto land. Mammoet fulfilled an advisory role at the start of the project and conducted the load-in. In total, the organization deployed 436 skid tracks, 64 skid shoes and 36 push-pull units to bring the soccer field-sized topside onto shore. The topside will be dismantled during the next 12 to 18 months. At least 97% of the platform will be recycled and used for other purposes. A new quay has been constructed at Able Seaton Port to facilitate the arrival. It is one of Europe’s strongest quays and represents a £28m investment.

Saving operational time
The load-in wasn’t the only record breaking component of the project. One week earlier, Allseas performed the heaviest single lift ever by removing the Brent Delta topsides with Pioneering Spirit – a ship especially designed for single lift installation and removal of oil and gas platforms. Next, the topsides was transported to the port of Hartlepool, where it was transferred from Pioneering Spirit to Iron Lady, a purpose built cargo barge on which Mammoet had pre-installed its skidding system. The barge, in turn, was brought over and grounded onto a grounding pad in front of the quay. Preparing the barge ahead of the load-in and grounding her saved a lot of operational time at the decommissioning yard and increased both safety and actual skidding time, which ultimately took only nine hours.
Credits : mammoet