Tyra Redevelopment

General information

ProjectTyra Redevelopment 
LocationNorth Sea (Denmark) 
VesselsPioneering Spirit, Fortitude 
Max. water depth42 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