OSD-IMT, the UK division of Offshore Ship Designers (OSD), has developed a range of innovative new designs of offshore wind-farm service operation vessels (SOVs).
The 1,350 dwt IMT972 SOV is powered by two Steerprop SP25 or equal 1900 kWe fixed pitch azimuth propulsion units. There is also an option for fitting two 2.5 MW Voith Turbo main thrusters. Frequency-controlled electric motor-driven CPP thruster units are fitted forward, comprising two tunnel-type bow thrusters and one retractable bow thruster for station-keeping and high-dynamic performance under manoeuvring or DP conditions.
The IMT972 has a LOA of 72.20 m and conforms to the Clean Design classification requirements of DNV for wind-farm service operation vessels. It can provide accommodation for up to 60 persons, including 22 crew, and is able to operate for 30 to 45 days on station, and longer if replenished at sea.
The main features of the IMT972 include a heave-compensated turbine platform, and an aluminium access gangway arranged with a telescopic frame which facilitates the transfer of equipment to the platform. A back-up evacuation process is arranged by using the workboat to transfer technicians from the turbine access ladder in an emergency. The vessel has a small pallet lift and conveyor lift system for the loading and transfer of stores and spares, with access to/from a heated under-deck workshop and stores area. A mono-hull workboat is fitted with a heave-compensated single point lift davit for general wind turbine work duties as well as for emergency evacuation of technicians.
There are two boat-landing areas, one starboard and one at the stern of the vessel. There is a large deck area arranged for additional equipment or the retrofitting of an ROV system for turbine tower or seabed inspection.