Seven Borealis
Seven Borealis anchored off Limassol, Cyprus
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The Seven Borealis is a ship that can be used both as a pipelayer and as a floating crane . The work ship is owned by the offshore service provider Subsea 7 . It sails under the flag of the Bahamas with home port Nassau .
history
The ordered on 25 May 2007 the ship was under the hull number SSPL H07-02 on the shipyard built Nantong Yahua Shipbuilding Co.. The keel was laid on November 10, 2008, the launch on October 19, 2009. The ship was completed on February 21, 2012.
Technology and equipment
The ship is equipped with a diesel-electric drive. The power generation on board is carried out by six Rolls-Royce - Diesel generators of the type Bergen Engines B32: 40V12A each with 5,760 kW of power. The two drive motors, each with an output of 5500 kW, act on two propeller pods (type: Rolls-Royce UUC 455 FP). In addition, there are four more extendable propeller pods (type: Rolls-Royce UL 305 FP), which are driven by electric motors with an output of 3200 kW. Three of them are installed in the bow area and one at the stern. The ship thus has a system for dynamic positioning (DP 3). A transverse thruster (type: Rolls-Royce TT 3000 CP) with an output of 2500 kW is installed in the bow as a maneuvering aid . The propeller pods for the drive can be dismantled under water. An MTU V12 4000 diesel generator with an output of 1600 kW is available for emergency power supply and port operations .
The operator states a sea endurance of 45 days for the transit with 220 people and for the stay at the place of work with 399 people on board.
The fuel supplies are at most:
- 3370 m³ heavy fuel oil
- 2980 m³ of marine diesel oil
- 92 m³ of lubricating oil
- 26.24 m³ drinking water
Pipe laying equipment
The Seven Borealis is designed to lay pipes with both the S-Lay and the J-Lay method. The S-Lay pipe laying system has a dynamic holding force of 600 t and can be used for pipes from 4.5 up to 46 inches with sheathing. The greatest laying depth is 3000 m. The J-lay system has a static holding force of 750 t and a dynamic 937 t. Cable diameters from 4 to 24 inches with sheathing can also be laid down to a depth of 3000 m. Up to 2800 t of piping can be stored on deck.
Crane system
A slewing crane with a maximum lifting capacity of 5000 tonnes, 4000 t at 40 m and 1500 t at 78 m radius is located in the center of the aft deck. In addition, there is a 40-t crane on the starboard side, a 40-t crane on the port side and a 36-t crane on the port side in front.
See also
- Overview of the most powerful floating cranes
- Work ship and pipelayer Seven Phoenix
Web links
- Data sheet of the ship (PDF; 1.2 MB)