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m.v. Frank Bonefaas SCH 72, converted to face the challenges of the future


Last Saturday, the SCH 72 ‘Frank Bonefaas’ set sail from her homeport of IJmuiden for her first fishing trip following 18 months of intensive conversion work. With the exception of the hull, practically everything on board is new. The vessel is now more energy-efficient,  environmentally-friendly and a safer vessel for her crew.

More than 50 Dutch subcontractors spent over a year working at the Damen shiprepair yard in Flushing on the conversion of the ‘Frank Bonefaas’. The largest subcontractor was Johnson Controls who designed and installed the new refrigeration and freezing installations. Basically the design for the SCH 72 conversion was the same as for previous conversion projects on board the ‘Carolien’ SCH 81 and ‘Zeeland’ SCH 123. Energy-efficient compressors and large-surface heat exchangers have boosted the performance of these installations. By adding an ammonia regeneration system and automatic oil cleaning and feedback systems, ease of operation and safety have been improved while simultaneously further reducing the environmental burden. The underlying principle was a potential  25 to 30 per cent cut in energy consumption for each pack of frozen fish. The natural cooling agents ammonia (NH3)  and carbon-dioxide (CO2) are non-harmful for the ozone layer. The favourable energy characteristics also result in lower CO2 emissions. Based on its task of promoting sustainable fishery the European Fisheries Fund (EFF) contributed a subsidy to cover part of the costs of this new refrigeration and freezing installation.

Unlike previous major conversion projects on other stern trawlers, the SCH 72 was also fitted with a brand-new propulsion line. Here, too, the new design by ADS Ship Design is aimed at reducing environmental burdens and energy consumption. A new main engine (MaK 6M43C) replaced the old Deutz and a new auxiliary engine was added. The larger propeller and its blade design, combined with a new type of ducted propeller and a specially-designed propeller hub deliver greater output. As a consequence, less power is required to generate the same bollard pull. In terms of emissions, the SCH 72 is the first Dutch fishing vessel with engines that comply with the latest IMO emission requirements (Marpol Tier II).
Fishing deck
The most important innovations on the outside relate to the layout of the trawl deck, where a safer working environment has been created. The relocation of recovery rope winches onto the boat deck results in more working space on the afterdeck, and more safe standing room. Dangerous movements by the net are now countered by four hydraulic blocks  that slot into the afterdeck from the stern gantry, and the new net guide in front of the net drum. Two slide grooves have been created for the heavy weights on the nets, and trawl doors and floats can now be better stowed on board.
Alongside other vessels from the Vrolijk fleet, the ‘Frank Bonefaas’ will be participating in the acoustic research currently being undertaken in collaboration with the IMARES institute for Marine Resources and Ecosystem studies. The vessel will be ‘recalibrated’ to make the fish tracking equipment suitable for storing acoustic data observed from the vessel. The ‘Frank Bonefaas’ is now very well equipped to continue to provide high quality seafood from well managed pelagic fisheries in today’s environmentally conscious world. 

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