The world’s largest vessel Pioneering Spirit has crane-lifted the Valhall QP lower jacket out of the water using in-house designed, fabricated and installed lifting tools. The 2500-tonne jacket is now on its way to Stord, Norway, for recycling.
As much as 100 per cent of the steel is to be recycled. The removal work is part of developing the Valhall field centre to produce up to two billion oil equivalents.
To perform the job, Allseas had Machinefabriek Schaap cut, machine and assemble the hooks from 690 grade steel leftover from Pioneering Spirit’s new Jacket Lift System (JLS) beams. This Jacket Lift System is still under construction.
At the same time, Allseas Fabrication delivered the spreader bars and hook integration with lifting/operating frames and hydraulics. Design and procedures were drawn up by a team from the company’s Heavy Lift and Innovations Departments.
Cuts to the jacket legs and holes for the hooks were performed from Allseas’ offshore construction vessel Oceanic, with the vessel providing remotely operated vehicle (ROV) support. Before the lower jacket was removed, Allseas had also removed the 800-tonne upper jacket section.
Watch a video of the jacket removal made by Aker BP below.
Click here to watch the video: