VESSEL REVIEW | MO6 & MO7 – Versatile SWATH windfarm support vessels for UK’s Mainprize Offshore

MO6 (Photo: MarineTraffic/com/Eddy Decorte)

UK-based offshore renewables services provider Mainprize Offshore has placed a new series of aluminium windfarm support vessels (WFSVs) into service.

Designed by Walker Marine Design and built in Vietnam by Shipbuilding Asia, the sister vessels MO6 and MO7 will perform a range of tasks including crew transfer, offshore bunkering, and cargo operations.

Each WFSV has an LOA of 26 metres, a beam of 11 metres, a maximum draught of three metres, a displacement of 165.8 tonnes at full load, and capacity for 24 passengers/technicians and three crewmembers. The SWATH hull form of each vessel will enable transfers of personnel even in wave heights of up to two metres while a significant cargo capacity of up to 50 tonnes is ensured by the 190 square metres of total deck space.

MO6 (Photo: MarineTraffic/com/Eddy Decorte)

The interior on each boat features fully adjustable suspension seats for the passengers, a mess, a galley, crew cabins, showers, dual toilets, and storage for luggage and spare parts. All onboard spaces have both heating and air conditioning as well as wi-fi and 4G connectivity.

The WFSVs are each powered by two Caterpillar C32 engines that each produce 1,193 kW at 2,300 rpm. The engines drive controllable-pitch propellers via ZF gearboxes to deliver a top speed of 23 knots, a range of 2,500 nautical miles at a cruising speed of 21 knots, and a bollard push of 22 tonnes. Two Caterpillar C2.2 21kW generators are also fitted.

MO6 (Photo: MarineTraffic/com/Eddy Decorte)

The electronics suite includes Sailor MF/HF and VHF radios, an Asus ECDIS, and a Furuno package consisting of main and auxiliary radars, a compass, GPS, and AIS.

Design work on the new Mainprize Offshore WFSVs was done in compliance to Bureau Veritas class rules.

MO6 & MO7
Type of vessel:Windfarm support vessels
Classification:Bureau Veritas
Owner:Mainprize Offshore, UK
Designer:Walker Marine Design, UK
Builder:Shipbuilding Asia, Vietnam
Hull construction material:Aluminium
Length overall:26 metres
Beam:11 metres
Draught:3.0 metres
Displacement:165.8 tonnes
Deadweight tonnage:99
Main engines:2 x Caterpillar C32, each 1,193 kW at 2,300 rpm
Gearboxes:2 x ZF
Propulsion:2 x controllable-pitch propellers
Generators:2 x Caterpillar C2.2, each 21kW
Maximum speed:23 knots
Cruising speed:21 knots
Range:2,500 nautical miles
Bollard push:22 tonnes
Radars:2 x Furuno
Radios:Sailor MF/HF; Sailor VHF
Other electronics:Asus ECDIS
Accommodation:Mess; galley; crew cabins; showers; dual toilets

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