Allseas - Cantilever of Pipe Laying Vessel Solitaire

Customer profile
The Swiss-based Allseas Group S.A. is one of the major offshore pipelay and subsea construction companies in the world, operating specialised vessels - which were designed in-house.  Founded in 1985, they have gained world-wide experience in all types of offshore and subsea construction projects.  Allseas' approach is to support clients already in the conceptual design stage and offer its services for project management, from engineering and procurement up to and including installation and commissioning.They do not restrict thereselves to available technology, but develop new techniques and applications wherever necessary.
 
Challenge
  • Fatigue Enhancement in the Cantilever of the Stinger Handling System
  • Material Weldox 700 (S690)
Solution
  • Treat existing and repaired welds with UIT
  • Fatigue tests preceding treatment (TU Delft 3M):
    • Post Weld Improvement Factor: 8.7-12.2 at 250 MPa and 2.2-2.7 at 410 MPa stress range

Benefits

  • Reduction of Down Time
  • Enhanced Fatigue Life

Close out note Allseas