HMC is currently developing a new generation semi-submersible crane vessel: Sleipnir. The Sleipnir is designed for worldwide offshore heavy lifting. It will be equipped with two cranes of 10,000 metric tonnes lifting capacity each and a reinforced deck area of 220 meters in length and 102 meters in width, which will make it the largest crane vessel in the world.
The dual cranes provide for heavy lifting capacity both to install and remove jackets and topsides. Furthermore, the cranes can be utilized for installation of foundations, moorings and structures in deep water. The Sleipnir is self-propelled with a minimum service speed of 10 knots, with power generated by means of dual fuel engines – MGO & LNG. Station-keeping is by means of dynamic positioning (DP3) or mooring system.
Dimensions
| Length overall | 220 m | 721 ft |
| Beam overall | 102 m | 334 ft |
| Length over Work Deck | 180 m | 590 ft |
| Beam over Work Deck | 97.5 m | 320 ft |
| Depth to Work Deck | 49.5 m | 162 ft |
| Draft range | 12-32 m | 39-104 ft |
Accommodation / Helicopter Deck
The living quarters are equipped to accommodate 400 men in single and double cabins. All quarters have heating and air conditioning facilities.
Helicopter Deck
The helicopter deck has a diameter of 28 m and a load capacity of 15.6 mT. It is suitable for an Augusta Westland EH101 or a Sikorsky S-92.
Life-saving / Fire-fighting Equipment
Sleipnir will be equipped with nine free-fall lifeboats with a capacity of 70 persons each, divided over three lifeboat stations (three lifeboats per lifeboat station).
Station Keeping / Propulsion System
DP System:
IMO equipment Class 3, Lloyd's Register DP (AAA).
Thrusters:
Forward end - Four (4) retractable, underwater demountable fixed pitch, variable speed azimuth thrusters of 5.5 MW each.
Aft end - Four (4) underwater demountable fixed pitch, variable speed azimuth thrusters of 5.5 MW each.
Mooring System:
4 x 3 point mooring system, 3 1/8" wire ropes of 1,750m, minimum breaking strength 578 mT
Stevpris Mk-6 anchors of 12 t each.
DP Modes of Operation
- Joystick
- Mixed joystick/auto
- Auto heading
- Auto position
- Heavy lift mode
- Green DP control
Position Reference System
- 2 x DGPS, Kongsberg DPS 5D
- 2 x DGPS, Kongsberg DPS 232
- 1 x Radius, Kongsberg 1000D
- 1 x Spottrack, Kongsberg
- 2 x HPR, Kongsberg HiPAP 501 with HAIN
- 1 x Tautwire, Mk 15/500
Port Side and Starboard Heavy Lift Cranes
Boom Length | 144 m (from heel point to whip hoist) |
| Boom Clearance (to deck) | 28.0 m in stowed position |
| Main Hoist Capacity - Revolving | 10 000 mT between 27 - 48 m radius 7 000 mT at 62 m radius 4 000 mT at 82 m radius |
| Main Hoist Lifting Height | from -20 m up to 129 m (above waterline at 32m draft) |
| Main Hoist Maximum Radius | 102 m |
| Auxiliary Hoist Capacity - Revolving | 2 500 mT between 33 - 60 m radius |
| Aux. Hoist Lifting Height | from -50m up to 165 m (above waterline at 32 m draft) |
| Aux. Hoist Maximum Radius | 135 m |
| Whip Hoist Capacity - Revolving | 200 mT between 37 - 153 m radius |
| Whip Hoist Lifting Height | from -100m up to 181 m (above waterline at 32 m draft) |
| Whip Hoist Maximum Radius | 153 m |
| Deep Water Lowering | heave compensated capacity per crane 1 000 mT at 1 000 m below sea level 760 mT at 1 500 m below sea level 240 mT at 3 000 m below sea level |
Auxiliary Crane
| Deck Crane | One pedestal mounted, lattice boom crane 70 mT at 12 m radius 25 mT at 60 m radius 8 t at 72 m radius Range up tp 2 000 m water depth Man riding certified |
Power Generation
Main Power:
96 MW total main power plant, consisting of 12 engines of 8 MW each, divided over four engine rooms (three engines per engine room).
Fuel (dual):
Low sulphur Marine Gas Oil (MGO) and Liquified Natural gas (LNG)
Emission Limits:
Compliant to IMO Tier III requirements.
Deck Load
| Heavy Lift Lay Down Area | 15 mT/m2 |
| Main Deck | 10 mT/m2 |
| Total Deck Load Capacity | 20 000 mT |
| Total Deck Area | 12 000 m2 |