GENERAL

Name: Byford Dolphin
Flag: Singapore
Manager: Dolphin Drilling Ltd. 
Year Built: 1974; Upgraded 1979, 1985, 1990, 1992, 1996, 1998, 2000, 2009.
Design: Aker H3
Classification: DNV + 1A1, Column Stabilised Drilling Unit

OPERATING PARAMETERS

Water Depth: 1500 ft (458 m)
Maximum Drilling Depth: 20,000 ft (6096 m)
Transit Speed: Approx. 4,5 knots
Design Conditions:
Wind speed: 169 ft/s (100 knots),
Max wave height: 102 ft (31 m)

DRILLING EQUIPMENT

Derrick: Continental Emsco 22 BDD 168 x 40 x 40 ft with retrofit 10 ft extension in 1996; 1,200,000 lbs static
Drawworks: National 1625 DE (3 x 800 hp)
Rotary: Continental Emsco T-4950, 49 ½”, 800 hp
Topdrive: Varco TDS-4
Riser Tensioners: 8 x Rucker Shaffer 80,000 lbs (Total 640,000 lbs capacity)
Motion Compensators: Crown Mounted Compensator, Shaffer CMC-25-600-DA; 25 ft stroke; 600,000lbs capacity
Mud Pumps: 3 x National 12-P-160 Triplex

MACHINERY

Main Power: 4 x Rolls Royce (Bergen) kVGB-12 (4 x 1,910 kVA)
Emergency Power: 1 x MTU (1 x 844 kVA)
Propulsion: In-line Propulsion, 2 x 1700 bhp

SUBSEA SYSTEMS

BOP: Hydril 18 ¾”, 15,000 psi
Control System: Shaffer direct hydraulic system retrofitted in 2000
Diverter: Regan KFDS 3
Choke and Kill: McEvoy 3 1/16” 15,000 psi, H2S