Transocean - Stack Nest


Transocean Stack Nest Re-activation - Port Gentil, Gabon, West Africa


Since the second quarter of 2011, HSOG (Africa Division) have been actively involved in the rig

re-activation process on the Transocean Stack Nest prior to loading the MODU’s on to heavy lift vessels to be transported to shipyard’s for further upgrade works.
Within the stack nest was Transocean’s MODU’s:

  • Trident IV
  • Adriatic I
  • Adriatic II
  • Adriatic V
  • Adriatic VI
  • Adriatic VIII
  • High Island V
  • Alucian Key

All MODU’s were bridged together and the Trident IV was used as the “Mother Ship” to accommodate the crew while working on board the rigs.
During the re-activation phase, HSOG have carried out DROPS surveys/sweeps on all areas at height and eliminated all potential dropped objects at time of find. There have been steel replacement, coatings replacement, access and platform removals, general fabrication and welding, confined space/structural repairs within tanks and voids, industrial cleaning including HP wash downs of decks, spud cans etc., and all aspects of NDT carried out.
All of the above scopes were carried out in conjunction with IRATA rope access techniques and traditional scaffolding methods, all of which were provided by HSOG via our UK, Gabon and Cape Town facilities utilising a mixture of local content and expatriate labour.