Lorelay

Lorelay  is a versatile vessel optimised for the execution of small and medium diameter pipeline projects of any length in unlimited water depths, and for associated work such as the installation of risers and subsea protection frames.

As the world’s first pipelay vessel to operate on full dynamic positioning when she was launched in 1986, Lorelay  represented a new generation of offshore pipelaying vessel. Her ship-shape allows for a high transit speed, while a large pipe storage capacity means she is less dependent on offshore pipe supply. Lorelay  can position precisely and safely in congested areas and lap pipes in very deep water. Lorelay  has laid many deepwater steel pipelines; in 1996 she set a new record for deepwater pipeline installation, laying a steel pipe to a depth of 1645 m (5400 ft) in the Gulf of Mexico.

Technical design

Vessel specifications

Length overall (incl. tilting lift beams and stinger)236 m (744 ft) 
Length overall (excl. tilting lift beams and stinger)183 m (599 ft) 
Length between perpendiculars150 m (492 ft) 
Breadth26 m (85 ft) 
Depth to main deck16 m (52 ft) 
Operating draught6–9 m (20–30 ft) 
Maximum speed16 knots 
Total installed power17,760 kW 
Thrusters1 x 3000 kW and 2 x 5000 kW azimuth, 2 x 2550 kW tunnel and 1 x 6000 kW fixed pitch  
Dynamic positioning systemFully redundant, class 3 Kongsberg K-Pos DP-22, K-Pos DP-12 and cJoy system
 
Accomodation230 persons 
HelideckMaximum take-off weight 12.8 t, suitable for Sikorsky S-61N and S-92 helicopters 
Deck cranesSpecial purpose crane of 300 t (660 kips) at 14 m (46 ft) main hoist
Pipe transfer crane of 16 t (40 kips) at 33 m (108 ft) main hoist  
Work stationsFiring line with 6 (single joint) welding stations, 1 NDT station and 3 coating stations  
Installed tension capacity3 x 55 t (3 x 120 kips). Optional 4th tensioner, 100 t (220 kips) 
Pipe cargo capacity on main deck8200 t 
ROV150 HP work-class ROV, rated to 4000 m depth (13,000 ft), for subsea surveys and intervention work 
Pipe diametersFrom 2" to 28" OD 
ClassificationsLR 100 A1, Pipe Layer, *IWS, LI, () LMC, UMS, DP (AAA) 
Port of registryValletta

Lorelay  projects