Page 46: of Maritime Reporter Magazine (January 2014)

46 Maritime Reporter & Engineering News • JANUARY 2014

The Tungsten Explorer is an ultra deepwater, dynamically positioned mobile offshore drilling unit (Drillship). The primary areas of activities of the Drillship shall be in the Gulf of Mexico,

West Africa and Brazil. The drillship has drilling equipment on the topside with a continuous main deck and forecastle deck. Three engine rooms which house six diesel engines (7,000 kW x 720 rpm) are arranged aft in the hull. Thruster ma- chinery spaces are arranged in engine rooms and in the forward machinery space of the hull, with each space containing motors and controls for azimuth thrusters of 5,500 kW used to dynami- cally position or propel the drillship. While the drillship is equipped with a ship’s anchors for temporary mooring, no spread mooring system is fi tted for station keeping. The hull contains no permanent ballast.

The “double” hull (i.e., inner bottom and wing tanks arranged) exhibits no sheer but has straight camber on the outboard portion of its weather or main deck. A large moonpool is situated with its center slightly forward of midships; a fl ap is ar- ranged at its aft end to prevent wave slap in the moonpool during transit.

An accommodation house is situated inside and above the forecastle; a helideck is located on top of the house. The drilling equipment has been ar- ranged on top side area mostly. From fore to aft, the modules are as follows: mud module for mud pump, sack storage, cement unit, liquid mud stor- age and auxiliary machinery, substructure with derrick, substructure buildings for shale shaker and BOP control and riser & well test platforms for riser racking, ROV and well test equipment.

A pipe rack is arranged on the roof of the mud module.

Tungsten Explorer Main Particulars

Hull No. .......................................................................3615

Model test ................................................................ MARIN

Flag ...................................................................... Bahamas

IMO number ...........................................................9631735

Length (o.a.) ..............................................................238 m

Length (b.p.) ..............................................................230 m

Breadth molded ...........................................................42 m

Depth molded to freeboard deck ...................................19 m

Depth molded to upper deck .........................................19 m

Width of double skin, side: ...........................................6.6 m

Width of double skin, bottom ........................................2.7 m

Draft, scantling ............................................................13 m

Draft, design................................................................12 m

Tonnage ..............................................................68,000 gt

Displacement ....................................102,000 mt (operating)

Deadweight, design .................................65,000 metric tons

Deadweight, scantling .............................74,000 metric tons

Speed, service (85 %MCR output) ............................12 knots

Bunkers, diesel oil .............................................9,400 cu. m.

Water ballast ..................................................58,235 cu. m.

Daily fuel consumption,

Main engine only ...............................184 t/day @ 100% load

Classifi cation American Bureau of Shipping + 1A, (E), “Drillship”, *AMS, *ACCU, *CDS, *DPS-3, SH-DLA, UWILD, CRC.

Main engine .............................6 x STX-MAN-B&W, 14V32/40

Output of each engine ...........................7,000 kW x 720 rpm

Propellers ......................................................6 x Rolls-Royce

Main engine driven alternators............6 x HHI HSJ7 1209-10P

Emergency Generator Set ..............STX-MAN 7L27/38(engine)

Cranes ..............................4 x Liebherr, Slewing Bearing type

Special lifesaving equipment .................. Norsafe - 6 sets and ...............................................................70 persons (95kg)

Ballast control system ..............GE Power Conversion (Former

Converteam)

Water Ballast Treatment System .......PANASIA (700 m3/hr x 2)

Complement .................................................................200

Bow thrusters ....3 x Rolls-Royce, Aquamaster Model UUC 455

Output (each): ......................................................5,500 KW

Stern thrusters ..3 x Rolls-Royce, Aquamaster Model UUC 455

Output (each): ......................................................5,500 KW

DP & Integrated Automation System ......GE Power Conversion (Former Converteam)

Fire detection system ....................................................Tyco

Integrated bridge system ...........................................Furuno

VESSELS

Ultra Deepwater Drillship designed for drilling opera- tion down to 40,000 ft. (12,120 m) & in water depths to 10,000 ft. (3,048 m)

Drillship Tungsten Explorer

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