One of the heaviest offshore jacket lifts of all time:

Offshore installation and decommissioning contractor Allseas has removed the Ninian Northern jacket in the North Sea in a single lift, showcasing its new jacket lifting system installed on board its giant vessel Pioneering Spirit.

In what was the first deployment of the new jacket lift technology, Pioneering Spirit removed CNR International’s Ninian Northern jacket from the northern North Sea and transported it intact to shore for recycling.

Weighing 8,100 tonnes, the first commercial lift fitted with Pioneering Spirit’s Jacket Lifting System (JLS) is one of the heaviest offshore lifts ever built, but falls well short of the system’s unique 20,000 tonne lifting capacity , said Allseas.

The 382m long Pioneering Spirit arrived at Ninian Field, 160km northeast of the Shetland Islands, on 15 April. A week later, after final preparations and trimming of the legs, the eight-legged jacket was lifted out of the water and lowered onto the deck for transit. The jacket will be delivered to the Veolia-Peterson shipyard in Dales Voe, Shetland. The facility is aiming for 98% steel reuse.

“Yesterday’s lift successfully concludes two years of planning and design, which began with the safe and successful single-lift removal of the tops of the 14,200t Ninian Northern Platform by Pioneering Spirit in 2020” , said Allseas.

“CNR International’s decision to select Pioneering Spirit for the removal of the Ninian Northern liner demonstrates the industry’s confidence in Allseas’ innovative engineering solutions and further reinforces our reputation as a leader in the global energy market. offshore,” said the chairman of Allseas. Edward Heerema.

“Fundamentally Different”1 credit

Fundamentally different from conventional crane-lift vessels, the stern-mounted system comprises two connected 170-meter-long beams that lift and support jackets of all sizes during removal and installation operations, Allseas explained.

According to Allseas, the system also allows the jackets to be transported in a nearly upright position to preserve the integrity of the structure. The technology allows direct transfer of structures to and from the dock and eliminates the need for support barges.

“There is no need to tie the jacket to the beams during transit due to the vessel’s high level of stability, significantly reducing time spent on the ground and reducing carbon footprint,” Allseas said.

“With the successful retirement of the Ninian Northern Jacket, Allseas has achieved its long-term vision of a vessel that provides the offshore industry with a total solution for offshore work,” adds Heerema.

According to Allseas, Ninian Northern is the first of several major jacket removal and installation engagements for Pioneering Spirit in 2022. The vessel will lift and transport over 123,000 tonnes of structures for the offshore energy industry this year in using both his jacket lift and movement. compensated lifting systems for topsides.

The Pioneering Spirit was recently in the Netherlands where he installed the HKZ Beta topside for TenneT in support of Vattenfall’s Hollandse Kust Zuid offshore wind farm. Offshore Engineer visited the HKZ site last month, just as the Pioneering Spirit was preparing to depart. Learn more here.

Additionally, Offshore Engineer Elaine Maslin recently interviewed Allseas CEO Edward Heerema to learn more about the liner lift system, as well as Allseas’ entry into deep sea mining. . Learn more here.