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crane were designed and manufactured by Huisman in Rotterdam. The vessel combines state-of-the-art technology with industry leading safety standards and is capable of operating in water depths of up to 3,000 m. "This project has been achieved due to successful alignment of the interests of Subsea 7 and its key shipbuilding and pipelay suppliers," said Mel

Fitzgerald, CEO at Subsea 7. "The www.seadiscovery.com Marine Technology Reporter 21

A massive traction winch for the

Seven Seas.

Seven Seas Main Particulars

Length, o.a. . . . . . . . . . . . . . . . . . . . . . . . . .153.24 m

Breadth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28.4 m

Depth to Maindeck . . . . . . . . . . . . . . . . . . . . .12.5 m

Draft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.5 m

Cargo Deck Area . . . . . . . . . . . . . . . . . . .1750 sq. m.

Deadweight . . . . . . . . . . . . . . . . . . . . . . . . . .10130 t

Gross Tonnage . . . . . . . . . . . . . . . . . . . . . . .18,250 t

Net Tonnage . . . . . . . . . . . . . . . . . . . . . . . . . .5,475 t

Active heave compensated . .400/350t offshore crane

ROVs . . . . . . .2 x Workclass ROVs rated to 3,000 m

Moonpool . . . . . . . . . . . . . . . . . . . . . . . .7.5 x 8.5 m

Carousel's . . . . . . . .2 x 1250 t carousels below deck . . . . . . . . .3,000 t carousel or multiple reels on deck

Thrusters . . . . . . .3 stern mounted azimuth thrusters . . . . . . . . . . . . . .2 bow retractable azimuth thrusters . . . . . . . . . . . . . . . . . . . . . . . . .1 bow tunnel thruster

Service Speed . . . . . . . . . . . . . . . . . . . . . .13 knots+

Accommodation . . . . . . . . . . . . . . . . . . . . . . . . . .120

Maneuvering and Propulsion Systems

Generators . . . . . . . . .6 x 3360 kW (Diesel Electric)

Propulsion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 x 2950 kW stern azimuth thrusters (Wärtsilä) . . . . .2 x 2400 kW bow azimuth thrusters (Wärtsilä) . . . . . . .1 x 2200 kW bow tunnel thruster (Wärtsilä)

Total thruster power . . . . . . . . . . . . . . . . .15,850 kW

Dynamic Positioning Systems

DP Classification DP (AA) (Class II)

DP System . . . . . . . . . . .Kongsberg Simrad SDP 22

Reference Systems . . . . . . . . . . . .2 x Veripos DGPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 x HiPAP 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 x taut wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 x fanbeam

Tank Capacities (100%)

Marine Gasoil . . . . . . . . . . . . . . . . . . . . .2480 cu. m.

Fuel Oil . . . . . . . . . . . . . . . . . . . . . . . . . .1227 cu. m.

Potable Water . . . . . . . . . . . . . . . . . . . . . .655 cu. m.

Ballast Water . . . . . . . . . . . . . . . . . . . . .4530 cu. m.

Anti-Heel Tanks . . . . . . . . . . . . . . . . . . .1538 cu. m.

Stabiliser Tanks . . . . . . . . . . . . . . . . . . . .716 cu. m.

Technical FW (in WB Tanks) . . . . . . . . . .685 cu. m.

Deck Cranes

Huisman Main Deck Crane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Offshore 350 t @ 13 m (double fall) . . . . . . . . . . . . . . . . . . . . .200 t @ 25 m (single fall)

Auxillary Hoist . . . . . . . . . . . . . . . . . . . . . . . . . .20 t

Auxiliary Deck Crane II (Stbd Midships) 12 t @ 25 m

Auxiliary Deck Crane III (Ramp Top) . . . . . . . .20 t

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