Transocean Rather
The TRANSOCEAN RATHER is a GVA-4500 Enhanced design semi-submersible drilling unit, capable of operating in harsh environments and water depths up to 4,500 feet using a 18¾in, 15,000 psi BOP and a 21in OD marine riser.
Rig Type	Other Deepwater
Design	GVA/Sonat enhanced GVA-4500 propulsion assisted semi-submersible
Builder	Daewoo Shipbuilding & Heavy Machinery Ltd, Okpo, South Korea
Year Built	1987/1995
Classification	DnV + 1A1 HELDK, DRILL, CRANE, ICE T
Flag	Panama
Accommodation	108 berths + 2 Transocean Office, 2 Client Office, 1 Hospital
Helideck	89ft x 89ft; Chinook 234 or Sikorsky S-61
Moonpool	63ft x 20ft
Station Keeping	Moored
Max Drill Depth	25,000 ft / 7,620 m
Max Water Depth	4,500 ft / 1,372 m
Operating Conditions	Significant Wave: 30ft; Wind: 50 knots; Current: 2 knots
Storm Conditions	Maximum Wave: 100ft; Wind: 80 knots; Current: 2.5 knots

Technical Dimensions

Length	325 ft	99 m
Breadth	287 ft	87 m
Depth	144 ft	44 m
Operating Draft	82 ft	25 m
Ocean Transit Draft	29 ft	9 m
VDL - Operating	3,857 st	3,500 mt

Capacities

Liquid Mud	4,200 bbls	23,581 cu ft	667 cu m
Drill Water	10,813 bbls	60,710 cu ft	1,718 cu m
Potable Water	2,968 bbls	16,664 cu ft	472 cu m
Fuel Oil	10,146 bbls	56,965 cu ft	1,612 cu m
Bulk Mud		10,958 cu ft	310 cu m
Bulk Cement		10,958 cu ft	310 cu m
Sack Material	3,520 sacks

Drilling Equipment

Derrick	Maritime Hydraulics 180 x 40 x 40ft; 680mt nominal capacity, , , , , , , ,
Drawworks	Continental Emsco C3, 3,000 hp; 1¾in drill line
Motion Compensator	Maritime Hydraulics (crown mounted), 272mt operating (681mt pinned)
Top Drive	Varco TDS-4S, 590mt
Rotary	Continental Emsco T-4950 with 49½in opening
Pipe Handling	Maritime Hydraulic MH 1147-97 Pipe Racker, Varco AR 3200 Iron Roughneck
Mud Pumps	3 x Continental Emsco FB-1600 (1,600 hp)
Shale Shakers	5 x Derrick Cascade
Desander	1 x Harrisburg DSN w/ (3) cones (1500gpm)
Desilter	1 x Harrisburg 1120 w/ (20) 4in cones (1100gpm)
Mud Cleaner	Degassers :- 2 x Burgess vacuum type rated @ 1,000 gpm
BOP	2 x Hydril 18¾in 15,000 psi double rams; Shaffer 18¾in 10,000 psi annular; Vetco ExF H-4 15,000 psi wellhead connector.
LMRP	Shaffer 10,000psi 18¾in annular, Vetco ExF HAR H-4 riser connector.
Diverter	Vetco KFDS; 500 psi w/ 3 x 12in ID flowlines.
Control System	NL Shaffer 24000 3 STL hydraulic control system.
Riser	53 x Vetco HMF 21in OD riser; 75ft joints with 15,000psi 3in ID C&K lines.
Riser Tensioners	545mt max. tensioning capacity
Guideline Tensioners	4 x Western Gear 7.25mt
Podline Tensioners	2 x Western Gear 7.25mt
Choke & Kill	2 x Swaco Ultrachokes and 2 x manual chokes (H2S rated).
Cementing	Hallibuton HT-400, 15,000 psi.

Machinery

Main Power	3 x Wartsila 12V-32D diesels each driving 1 x Stromberg 5,921 kw AC generator
Emergency Power	1 x Wartsila 6R32 diesel driving 1 x 2,140 kw AC generator
Power Distribution	General Electric Microdrill 3000 SCR for drilling
Deck Cranes	2 x M.A.N. Wolffkran HOK 800 HM, 120ft boom, 75mt @ 10.7m; 1x Miko gantry crane, 40mt
Thrusters	2 x 3,500 hp Kamewa thrusters, fully azimuthing, fixed prop, w/ nozzels.
Propulsion	Thrusters

Mooring Equipment

Winches	8 Hepburn w/ GE 752s
Wire/Chain	8 x 6,000 ft x 3¾in wire; 2,900ft x 84mm K4 chain
Anchors	8 x 18mt Bruce anchors