DORIS performed project management, detailed engineering and operations engineering of the heaviest platform in the world.
Project outline
- Total diameter 105 m
- Total height GBS + deck 150 m
- Total height GBS 110 m
- GBS weight 1.4 million t
- Deck size 98×34 m
- Total operating load 60,000 t
- Payload at final tow 39,000 t
- Total volume of concrete 165,000 m3
- Weight of reinforcing steel 85,000 t
- Weight of prestressing steel 5,000 t
- No. of conductors 64
- No. of risers 4
- No. of J-tubes 13
Providing oil drilling, storage and production, Hibernia is also the first iceberg resistant platform. It can resist the impact of an iceberg having a mass of more than 4 million tonnes and drifting at a speed of up to 1.35 m/s. The anti-ice wall consists of a series of triangular teeth regularly distributed on the circumference of the GBS.
Services delivered by DORIS
Across 2.5m manhours, DORIS delivered:
- Project management
- Detailed engineering
- Concrete: structural, dynamic and earthquake analyses, design of concrete components in temporary and in operating conditions
- Foundation including 3D finite element analysis
- Mechanical outfitting: temporary and permanent systems
- Marine operations
- BS moorings
- Float-out from dry dock
- GBS ballasting during afloat construction
- Topsides load-out, transportation and mating
- Final tow to field and installation
- Offshore works including underbase grouting and solid ballasting
