A pair of hybrid crew transfer vessels (CTV) with extensive zero-emission capability have been delivered to service the Hornsea Project 2 offshore wind farm in the U.K. North Sea for Ørsted.
The newbuilds, MHO Asgard and MHO Apollo, built by AFAI Southern Shipyard in China, are the third and fourth Incat Crowther-designed vessels for MHO & Co, following on from MHO Esbjerg and MHO Gurli.
MHO Asgard and MHO Apollo are powered by an advanced propulsion system that was developed in collaboration with Danfoss and Volvo Penta. The system comprises a pair of diesel drivetrains and a pair of diesel-electric drivetrains, each driving Volvo Penta IPS drives. The main diesel engines are Volvo Penta D13s, producing 515kW each. The generators used for the diesel-electric propulsion train are Volvo Penta D8-MH units. A further three of these units are located in the hulls amidship, alongside a Volvo Penta D5 used as a harbor generator. Propulsion is via highly efficient Volvo IPS units. Additionally, a Corvus battery system provides stored power for zero-emission operation.
The system offers exceptional flexibility, allowing the vessel to operate in zero-emission electric mode for up to eight hours, or in combination with diesel propulsion for a maximum speed of 25 knots. The flexibility is enhanced by the use of multiple modular generators, meaning power generation can be optimized for the operational profile.
Incat Crowther said it worked with MHO-Co to develop a design that improved on its predecessors, offering even more space and functionality. The flexible layout features a 110-square-meter foredeck with multiple tie-downs, deck crane, moon pool and the capability to take B2W, Bring-to-Work systems. The Z-Bridge BTW system has been trialed on MHO Esbjerg.
MHO Asgard and MHO Apollo accommodate 24 technicians in mid-deck cabins. A saloon for technicians is located on the main deck with 24 suspended seats, lockers, a pantry and a separate mess. Additional technician rest spaces are also located on this deck, as is a large wet room with lockers and showers.
Specifications - 35m catamaran hybrid CTV
Vessel Name: MHO Asgard, MHO Apollo
Principal dimensions
Length overall: 112’ 11” / 34.4m
Length waterline: 109’ 4” / 33.3m
Beam overall: 36’ 2” / 11m
Draft (hull): 4’ 10” / 1.45m
Depth: 13’ 8” / 4.15m
Construction: Marine grade aluminum
Capacities
Fuel Oil: 17,858 gallons / 67,600 liters
Fresh Water: 925 gallons / 3,500 liters
Sullage: 660 gallons / 2,500 liters
Personnel: 24
Crew: 8
Propulsion and performance
Speed (max): 25 knots
Diesel propulsion engines: 2 x Volvo Penta D13, 515kW @ 2,250rpm
Hybrid system: 2 x Danfoss EM-PMI, 550kW @ 2,250rpm
Propulsion: 4 x Volvo IPS 30
Generators: 5 x Danfoss EM-PMI Volvo D8, 230kW @ 1,900rpm
Regulatory
Flag: Denmark
Class / survey: DNV-GL 1A HSLC Crew Windfarm R1