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Friday, November 27, 2020 

Dutch system integrator Bakker Sliedrecht has received an order for retrofitting the propulsion drives of the Commissioners of Irish Lights vessel 'Granuaile' to extend the lifespan and service operations of the vessel for the remainder of her working life.

Around 20 years ago Bakker Sliedrecht supplied and installed the drive modules for the multi-functional Granuaile, at the time one of the most advanced vessels of its type in the world, and has since carried out regular maintenance.

The Granuaile is a class 1 DP vessel that is widely used for the management and maintenance program. The vessel has a 20t crane, towing and tugger winches, a large aft deck, a modern spacious bridge and a helipad. It is used, among other things, for buoy deployment, measurements at sea, inspection, sampling and mapping of shipwrecks and sea beds, cable and pipeline route survey, salvage and helicopter operations.

The vessel has diesel-electric propulsion, powered by two 1100 kW electro motors. The Granuaile also has a 1200 kW electromotor for the bow thruster. The three ACS600 frequency drives that drive the electric motors are obsolete and are no longer supported by the supplier. So Bakker Sliedrecht is replacing them with new ACS880 modules. However, space on board is limited and the panels in which the new modules are to be installed are difficult to reach. Bakker Sliedrecht will solve this problem by building new frequency inverter modules in the panels of the brake chopper. This way, they are easily accessible. The modules for the brake chopper are moved to the panels of the old frequency drives. The project additionally involves retrofit of air-cooled instead of water-cooled modules.

Bakker Sliedrecht has equipped many vessels with ASC600 drives, many of which now need to be replaced to keep the vessel in service. For example, Bakker Sliedrecht recently replaced all the frequency drives of several naval vessels.

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