Cube were selected to develop an innovating strengthening design to improve the structural integrity of an existing topsides module on the Woodside NGujima Yin FPSO.
The following design characteristics were achieved:
- Phase 1 strengthening work was all bolted and carried out during normal operations
- Phase 2 strengthening work (deck remedial scope) was welded and scheduled for future shipyard implementation
- Full integration with the offshore construction team to develop a sympathetic design for access, handling and installation operations
- All analysis carried out using Bentley SACS
- Limit state ULS / ALS (ISO19902) combined with ship motions, environmental loading and deck deflections.
- CAD models integrated with Point Cloud survey data for clash checking
- Significant reduction in module primary steel and deck utilisations achieved
Photo comparison with Point Cloud image.
SACS analysis showing original high structural utilisations prior to remedial bracing. Deck not modelled.
SACS analysis showing topsides with remedial bracing & reduced utilisations. Preliminary deck steel modelled showing high utilisations
SACS analysis showing extended deck model and longitudinal bracing to redirect and reduce deck utilisations.
Phase 1 – bolted bracing / strengthening to improve topsides integrity – implemented on station during normal operations
Phase 2 – welded longitudinal bracing to improve deck integrity – implemented in the shipyard during scheduled maintenance visit
