General information
| Client | Total |
| Project | Tyra Redevelopment |
| Year | 2020-21 |
| Location | North Sea (Denmark) |
| Vessels | Pioneering Spirit, Fortitude |
| Max. water depth | 42 m (140 ft) |
Scope of work
- Engineering, preparation, removal, transport and load-in of:
- 14,000 t Tyra East Alpha and 7,600 t Tyra West Alpha topsides
- 5,000 t Tyra East Alpha, 2,900 t Tyra West Alpha, 1200 t Tyra West Delta tripod and 900 t Tyra East Delta jackets
- 1,400 t Module K and 1,000 t IPF modules
- Pre-lift preparation work including removal and separation of underdeck caissons
- Design, fabrication and installation of bearing blocks to accommodate “horseshoe” lifting tools
- Leg cutting
- Transfer of topsides from Pioneering Spirit to Iron Lady and load-in to MARS yard (Denmark) for the topsides and modules and to Sagro recycling yard (the Netherlands) for the jackets
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
