EMAS AMC’s Lewek Constellation is a multilay offshore construction vessel with ultra deepwater pipelaying and lifting capabilities.
The vessel is set to be delivered in the second quarter of 2013 and start operations in 2014. It is being built by Sofel in Vung Tau, Vietnam.
The vessel will serve VAALCO Gabon to carry out operations at its Etame Marin Field located offshore of Gabon in West Africa. The vessel will join EMAS AMC’s Lewek Express pipelayer, to carry out offshore works for VAALCO under a contract worth $120m.
Lewek Constellation dimensions, accommodation and ancillary facilities
The vessel will have an overall length of 178.27m, moulded breadth of 46m, moulded depth of 15.6m and maximum draft of 10.5m. Its net tonnage capacity will be 14,636t and gross tonnage capacity will be 48,786t.
The vessel will have a deck area of 4,200mÂ² minus the reels and possess deck strength of 10t per mÂ².
It will be equipped with a K-POS (Kongsberg Maritime) DP3 system integrated with position reference and environmental sensor systems.
Lewek Constellation will be capable of accommodating 239 people in one berth cabins. Other ancillary facilities will include office rooms, recreation rooms, meeting rooms, gymnasium, smoking room and personal elevator.
Optional features aboard the pipelay and construction vessel
Lewek Constellation will feature three AQUA-SEP Series 3 water makers with a combined production capacity of 180t per day.
A helideck measuring 27.5mx277.5m, suitable for Sikorsky S-92 and S-61N will also be featured in the vessel.
Lewek Constellation remotely operated vehicle (ROV) system
Lewek Constellation will feature two 150HP Shilling HD work class remotely operated vehicle (ROV) systems capable of being launched from ROV hangars with dedicated moonpools. An RAPP Hydema launch and recovery system (LARS) will be featured inside the ROV hangars, which will be capable of operating at a water depth of 4,000m.
Cranes and pipelay equipment aboard Lewek Constellation
Lewek Constellation will feature a Huisman offshore mast crane with a lifting capacity of 3,000t including one deck crane with a lifting capacity of 80t and seven knuckle boom cranes.
Lewek Constellation’s pipelay equipment will include a combined pipelay tower for reel lay and flex lay over a moonpool.
It will include two rigid 400t each tensioners and two flexible tensioners of 260t each, a rigid 900t hang-off clamp, six removable 1,150t reels for rigid pipe and two fixed 1,250t each under-deck carousels for flexible pipe.
The equipment will also include an abandonment and recovery system (A & R system) comprising of two 600t each traction winches, along with a steel wire rope storage capacity of 4,000m with future J-Lay option.
Lewek Constellation safety equipment and communications
Safety equipment aboard the vessel will comprise of two NPT95 lifeboats capable of accommodating 120 people each, two Norsafe MAKO 655 fast rescue boats capable of carrying 21 persons each and twelve life rafts capable of carrying 20 people each.
Communications equipment for the vessel will include two very small aperture terminal (VSAT) KU band or C-Band satellite communication systems and two high bandwidth internet connection with a speed of 2,048kb per second.
Propulsion of the multilay offshore construction vessel
The vessel’s propulsion and machinery will include two MAK 12M32C main generators with a rated capacity of 5,760kW, six MAK 6M32C auxiliary generators with a rated capacity of 2,880kW, four Hyundai auxiliary generators with a rated capacity of 2,565kW and a Caterpillar C32 emergency generator, rated at 790kW.
The vessel will be equipped with two 6,000kW stern azimuth thrusters outboard, two 2,000kW stern azimuth thrusters inboard, two 3,000kW retractable thrusters forward, two 2,700kW tunnel thrusters and a 1,420kW tunnel thruster.
The thrusters will be provided by Rolls Royce.The vessel will have a transit speed of 12.5kt.