Description
Byford Dolphin drilling rig is an Enhanced Aker H-3 design which was built by Aker Group at the Aker Verdal shipyard in 1974. In 1974–1978, she was named Deep Sea Driller.
Byford Dolphin has a length of 108.2 metres (355 ft), breadth of 67.4 metres (221 ft) and depth of 36.6 metres (120 ft). She has a maximum drilling depth of 6,100 metres (20,000 ft), and she could operate at a water depth of 460 metres (1,500 ft). As a drilling rig, Byford Dolphin is equipped with advanced drilling equipment and has to meet strict levels of certification under Norwegian law. Byford Dolphin is able to maneuver with its own engines (to counter drift and ocean currents), but for long-distance relocation, it must be moved by specialist tugboats.
| Operating deck load | 3,025 tonne |
| Crew quarters | 102 persons |
| Operating water depth | 460 metres (1,500 ft) maximum |
| Derrick | 49-metre (160 ft) Shaffer top compensator |
| Mooring system | 12 point |
| Blow-out preventer | Hydril 476 mm (18.7 in), 10,000 kPa (1,500 psi) |
| Sub Sea Handling System | Christmas tree |
| Deck cranes | 2 × 40 tonnes |
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