Seven Borealis

from Wikipedia, the free encyclopedia
Seven Borealis
Seven Borealis anchored off Limassol, Cyprus
Seven Borealis anchored off Limassol, Cyprus
Ship data
flag BahamasBahamas (trade flag) Bahamas
Ship type Pipelayer / floating crane
Callsign C6YG8
home port Nassau , Bahamas
Owner Subsea 7
Shipyard Nantong Yahua Shipbuilding Company
Build number SSPL H07-02
Keel laying November 10, 2008
Launch October 19, 2009
takeover February 21, 2012
Whereabouts in service
Ship dimensions and crew
182.20 m ( Lüa )
168.60 m ( Lpp )
width 46.20 m
Side height 16.10 m
Draft Max. 11.35 m
measurement 49,735 GT / 14,921 NRZ
Machine system
machine diesel-electric
2 × electric motor
performanceTemplate: Infobox ship / maintenance / service format
11,000 kW (14,956 hp)
11 kn (20 km / h)
6 × diesel generator (Bergen Engine B32: 40V12A)
powerTemplate: Infobox ship / maintenance / service format
34,560 kW (46,989 hp)
propeller 2 × propeller pods (Rolls-Royce UUC 455 FP)
Transport capacities
Load capacity 47,000 dw
Dynamic positioning

Class 3, triple redundant

Classifications DNV GL
IMO no. : 9452787

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 .


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:

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

Web links

Individual evidence