| Client | Shell UK Ltd |
| Project | Brent Delta topsides removal |
| Year | 2017 |
| Location | North Sea, UK |
| Vessels | Pioneering Spirit |
| Max. water depth | 140 m (460 ft) |
| Platform type | GBS |
| Weight (t) | 24,000 |
| Dimensions L x B x H (m) | 74 x 72 x 130 (incl. flare stack) |
| Number legs | 3 |
| Leg diameter (m) | 15 |
| Cut location +/- sea level (m) | 16 |
• Engineering, procurement and removal of the 24,000 t Brent Delta topsides
• Pre-lift preparation work including design of under deck lift points and strengthening of the module support frame
• Cutting of the platform legs
• Design and fabrication of lifting yokes, support stools and grillage
• Transfer of topsides from Pioneering Spirit to Iron Lady and load-in to dismantling yard (Hartlepool, UK)
• World record lift
• Design and fabrication of lift yokes and stabilisation frames
• Design and fabrication of GBS concrete leg covers
• Design and construction of leg support structures
• Design of barge grounding bed
Challenges
• Heaviest lift to date with the topsides lift system, and first lift utilising all 16 beams
• Efficient design, fabrication and installation of platform lift points and strengthening while the platform being decommissioned
• Complete cutting of the legs prior to the single lift
