Skandi Acergy - Subsea Construction Vessel, Norway
Skandi Acergy is a subsea construction and flowline lay vessel that entered service with Acergy on a long-term charter in 2008.
Considered as a class leader amongst heavy construction vessels, Skandi Acergy began operations in August 2008 on the Morvin field development.
Contract for the delivery of the vessel was signed between DOF Subsea and Aker Yards (now STX Europe) in late summer 2006. The vessel was delivered to DOF Subsea in July 2008. The launch and recovery system of the vessel was supplied by MacArtney Underwater Technology.
Skandi Acergy design
Designed by STX Norway Offshore Design, Skandi Acergy meets the latest environmental criteria. The 156.9m long vessel has a cargo deck area of 2,100m². The moulded breadth of the vessel is 27m and length between perpendiculars is 137.7m.
The depth to the main deck is 12m, the design draft mid-ship is 6.5m and the maximum scantling draft mid-ship is 8.5m.
The vessel is designed and equipped for subsea operations and has good sea-keeping and station-keeping abilities. The vessel's design meets Det Norske Veritas' (DNV) clean design requirements.
Skandi Acergy has a fuel oil capacity of 2,300m³, ballast water capacity of 9,000m³ and fresh water capacity of 1,500m³. The vessel's open moonpool and closed moonpool deadweight are 11,500t and 13,000t, respectively.
Skandi Acergy construction
The steel-made double hull of Skandi Acergy was built at Aker Yards in Romania. The vessel was outfitted and completed at Aker Yards in Søviknes. The Ice class hull allows the vessel to operate in the northern North Sea and Barents Sea.
The work moonpool is the largest of the three moonpools and is built in the centre of the ship. The vessel also has been provided with a 21.8m diameter helideck, capable of accommodating an S92 helicopter.
Skandi Acergy accommodation and facilities
Skandi Acergy provides high standard, low noise level accommodation for 140 people in 58 single cabins and 41 double berth cabins.
Facilities on-board include three lounges, a library, a cinema hall, an internet cafe, a gymnasium and game rooms. The vessel also has several rest and day rooms. There are three client offices with six desks, and a client conference room.
Skandi Acergy is fitted with two 8L 32/40 MAN engines, each capable of generating 3,840kW at 720rpm, and four 6L 32/40 MAN engines, each capable of generating 2,880kW at 720rpm. The generator sets include two Siemens 1 DK 4 138-8AL05-Z and four Siemens 1FJ4 804-105D22 generators.
Astern of the vessel is installed with a frequency controlled, Kamewa-Ulstein, 86XF5/4E-3700 controllable pitch propeller and two Ulstein-Aquamaster azimuth propellers. There are two 1,500kW retractable azimuth thrusters and two 1,920kW tunnel thrusters installed at the fore of the vessel.
Navigation and communication
Skandi Acergy uses a K-POS DP-21 and a K-POS DP-11 BU Kongsberg Maritime Dynamic Positioning System (DPS). Its reference system includes a DP-IMO3, a wind sensor, a gyro-compass fan beam, motion reference units (MRU), a differential GPS, a hydro acoustic position reference system (HPR) and a position sensor system.
Other navigation and communication systems include Furuno radars and nautical equipment, a Furuno chartplotter and a Furuno radio station.
Skandi Acergy is equipped with a 400t active heave compensated (AHC) main deck crane manufactured by National Oilwell Varco. It is located on the port side of the vessel and is capable of operating to water depths of 3,000m.
There is also a 50t auxiliary crane, which is located on port side forward. Auxiliary crane components include three passive roll damping tanks, three 2,200m³/hr anti-heeling pumps, three 12.5t deck tuggers and one 30t deck tugger.
The vessel has been fitted with two Schilling ACV latest generation work class remotely operated underwater vehicles. The vessel's launch and recovery control system (LARS) handles winch synchronisation, gripper arm operation, moonpool door operation, and air bubble system stop and start.
Life saving equipment includes the Weedo 700 MOB (Man overboard) boat, a Hydramarine HMD A32 Mk3 MOB davit, Viking life rafts and Harding KISS800C life boats.
Other deck equipment includes an Aker Brattvaag winch (ABW), moorings and tuggers, winch and windlass.
An integrated automation system, power management, switch boards and other electrical appliances were manufactured and supplied by STX Europe Electro.