(Robert Allen)

Posted on October 6, 2021 at 7:06 p.m. by

The Maritime Executive







Canadian naval architects Robert Allan developed plans for his first methanol-powered crew transfer vessel. The project, supported by the Carbon Trust, UK and the Offshore Wind Accelerator programme, offers both significant cost benefits for offshore operators and paves the way towards eliminating carbon emissions from the sector.


“The ability to use green methanol marks the shift from the current linear fuel cycle to a circular fuel cycle, where harmful combustion wastes are converted back into useful fuels. This will have great benefits for generations to come,” said Erik Johnston, P.Eng., project manager for Robert Allan Ltd.


In addition to the environmental benefits of using methanol, Allen points out that it doesn’t need cryogenic or pressurized fuel tanks. This reduces investment costs, saves space and allows more fuel to be transported.


Four Scania DI16 main engines, each rated at 450 kW at 2,100 rpm, would provide propulsion. Converted to run on methanol by ScandiNAOS, these engines meet IMO Tier III emissions limits without any additional after-treatment. Two motors in each half-hull are connected to a twin-input gearbox driving a Servogear controllable pitch propeller system which helps to maximize both sprint speed and bollard thrust performance. Extensive in-house CFD analysis was used to achieve speeds in excess of 25 knots under full load. The ship’s design is also scalable, allowing it to transition to green methanol as it becomes more widely available. The design of the CTV complies with the guidelines and rules issued by Lloyd’s Register.


The 78ft design also provides cabins for the captain and two crew members in the half-hull accommodations. A spacious and comfortable technician’s lounge area with large forward and side windows on the main deck can accommodate up to 12 wind farm maintenance personnel.


The particularities of the Raptor 2400 are:


Overall length: 23.8m
Molded beam: 8.0 m
Molded draft: 1.1 m
Methanol capacity: 12 m3
Installed power: 1800 kW
Speed: >25 knots