GSF Explorer

7,800 Foot Ultra-Deepwater Drillship.

General Description 

Design	Global Marine / Hughes
Dimensions (Main Deck)	619 ft. x 116 ft. x 51 ft.
Draft at Loadline	35 ft.
Displacement at Loadline	55,978 lt.
Maximum Variable Load (drilling)	23,533 st
Quarters capacity	140 persons
Maximum Water Depth	7,800 ft.
Maximum Drilling Depth	30,000 ft.

Drilling Equipment 

Derrick	170 ft. x 61.3 ft. x 41.7 ft. Morinoak with a static hook load capacity of 2,000,000 lbs. with fourteen lines
Drawworks	National-Oilwell 2040, 5,000 hp, driven by four GE 752 DC motors, with hydraulic disc brakes and a Baylor 7838 auxiliary electric brake
Rotary table	National Oilwell C-495, 49-1/2 in. hydraulic motor driven, non-drilling
Top Drive	Varco TDS-1000 AC, 1000 short tons, continuous drilling torque rating 62,500 ft-lbs., with Varco PH 100 pipe handler
Pipe Handling System	Westech horizontal drill pipe racker capable of handling 30,000 ft. of 5-7/8 in. drill pipe in triples Varco PRS-4i vertical pipe racker capable of handling BHA’s, drill pipe landing string and casing (13-5/8 in. and smaller) to a maximum setback of 800 kips
Motion Compensator	Shaffer 1,000,000 lb. Crown Mounted Compensator with 25 ft. stroke and 2,000,000 lb. static load capacity
Mud Pumps	3 x National Oilwell 14-P-220, 2,200 hp triplex pumps each driven by two GE 752 Hi-Torque DC motors, rated at 7,500 psi; 1 x National Oilwell 12-P-160, 1,600 hp triplex pump, driven by two GE 752 Hi-Torque DC motors, rated at 5,000 psi (as booster pump).
Solids Control	4 x Axiom AX-1 Shale Shakers; 2 x Brandt DG 10 Vacuum Degassers

Storage Capacities 

Liquid Mud	6,229 bbls.
Base Oil	1,618 bbls.
Brine	5,382 bbls.
Drill Water	46,806 bbls.
Bulk material	36,000 cu.ft.

Power Equipment

Main Power	Four EMD MD 16E9B diesel engines each rated at 3,070 bhp, each driving a 2,200 kw, 4,160 VAC generator; five Nordberg FS-1316-HSC, 4,900 hp diesel engines each driving a 3,500 kw, 4,160 VAC generator
Emergency Power	One Detroit diesel 16V-149 emergency generator set providing 825 kw

Subsea Equipment

Marine Drilling Risers	Stewart & Stevenson SSQR-F 2,000,000 lbs., 21 in. OD 75 ft long with 3 in., 15,000 psi choke & kill lines
Riser Tensioners	10 x Shaffer single riser tensioner 200,000 lbs. each with 50 ft. wireline travel

BOP Equipment

Diverter System	Stewart & Stevenson complete shut off 21-1/4 in. through-bore, 500 psi with Oil States super flex joint
18-3/4 in. System	Two Shaffer SL 10,000 psi annular preventers, two Cameron 15,000 psi double rams and one Cameron 15,000 psi single ram

Pedestal Cranes

Deck Cranes

Two Seatrax 7228 cranes, one with 110 ft. boom, one with 100 ft. boom,  rated for 65 short tons at 60 ft. radius; two Seatrax 4220, one with 110 ft. boom, one with 90 ft. boom, rated for 25 short tons at 35 ft. radius

Dynamic Position & Propulsion

Propulsion	Two fixed pitch variable speed reversing propellers each powered by three 2,200 hp DC motors (13,200 hp total); five fixed pitch variable speed reversing tunnel thrusters each driven by 2,000 hp DC motor; four retractable azimuthing thrusters each driven by 3,000 hp motor; total station keeping horsepower 35,200
DP System	Triple redundant dynamic positioning system with quadruple DGPS position reference system and acoustic backup positioning system