General information
| Client | Total Denmark |
| Project | Tyra Redevelopment |
| Year | 2020-22 |
| Location | North Sea (Denmark) |
| Vessels | Pioneering Spirit, Fortitude, Oceanic |
| Max. water depth | 42 m (140 ft) |
Tyra Redevelopment
Scope of work
- Engineering, preparation, removal, transport and disposal of:
- 14,000 t TEA and 7,800 t TWA topsides (2020)
- 1,200 t TWD and 900 t TED flare jackets (2020)
- 1,400 t K and 1,000 t IPF modules (2020)
- 5,400 t TEA and 3,100 t TWA jackets (2022)
- Pre-lift preparation work including removal and separation of under-deck caissons
- Design, fabrication and installation of bearing blocks to accommodate “horseshoe” lifting tools
- Leg cutting
- Transfer of topsides, jackets and modules to Iron Lady for load-in to M.A.R.S. recycling yard at Frederikshavn, Denmark
- Transfer of flare jackets to Iron Lady for load-in to Sagro recycling yard at Vlissingen, the Netherlands
Project specials
- Design and fabrication of bearing block type lift points, (“horseshoe”) lifting yokes, leg support structures, spreader bars and frames
- Lift of modules and jackets with internal lifting tools (ILT)
- Subsea dredging and cutting with both internal and external cutting tools
- Load-in operations by means of hydraulic skidding for the topsides and Tyra East Alpha jacket, and SPMTs for the other structures
- Use of all Pioneering Spirit’s heavy lift systems (TLS, JLS and 5,000 t crane)
- Very limited air gap due to the subsidence of both fields (5 to 7 m)
- Very narrow span between the legs of the topsides i.e. high outreach for the TLS beams
- Proximity to the other platforms in the field
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