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OSD-IMT launches mini-SOV concept

By: Sue Allen 18/06/2021 OSDT-IMT

General Logistics Vessels

Ship design and marine consultancy OSD-IMT has designed a new 'mini' Service Operations Vessel (SOV), the OSD-IMT9604. The new design is in response to the changes to market demand for different solutions to offshore wind farm support.

The design is based on OSD-IMT's series of ERRV’s. The SOV concept is a LOA 51m design which provides accommodation for technicians and crew. The mini SOV aims to fill the gap between large CTV’s and SOV’s. It would be equipped with a Z-bridge Walk-2-Work system, which can work both as a technicians transfer system and as a motion compensated crane. For light weather conditions the daughter craft can be used to transfer up to two (six persons) wind farm service crews.

Accommodation space for up to 24 technicians is available with a covered storage area for spare parts and a battery hybrid power generation system driving the propulsion system make for a full-fledged DP2 SOV.

The methanol option

OSD-IMT is developing a methanol fuelled version of the OSD-IMT9604 to help further reduce emission of GHG’s and pollutants. This development takes place in close cooperation with the research department of Damen Shipyards.

Methanol produced from renewable sources is a so called e-fuel. The use of this methanol reduces the environmental footprint, especially the greenhouse gas emission, of a vessel considerably (50 to 90%, subject to the feedstock of the fuel). In combination with the relatively high energy density it makes for an attractive use as a fuel on ships, creating a lower emission profile while maintaining a good range and endurance. Both aspects are of particular interest for the offshore wind market; SOV’s must be able to remain on station or in the field for a longer period of time, emitting as little as possible to the environment.

The application of methanol does impact the design of the vessel. Methanol is considered a low-flashpoint fuel and as such poses special requirements to a number of arrangements on board. Tanks must be fitted with cofferdams, spaces and ventilation associated with the methanol system must be designed to prevent exposure to ignition sources or even physical contact.

In the OSD-IMT development of the methanol fuelled mini-SOV, these considerations have been taken into account, according to the company. The design is now being further developed to come to an AiP for the methanol system. Anticipating increased availability of methanol burning internal combustion engines, OSD-IMT feels this design is the right way forward.

For everything you need to know about the strategies used to support the construction and O&M of offshore wind farms, current and future, including supply and demand for service and accommodation vessels, and helicopters, click here.

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OSD-IMT launches mini-SOV concept

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