There was something of a delay in the delivery of Cuxhaven-registered pelagic trawler Kristin NC-336 to its Swedish owners, and despite the drawback of the delayed completion, this also brought some advantages.
The supplier originally contracted to produce Kristin’s hull unexpectedly withdrew from the agreement, so the work was transferred to Karstensen’s own yard in Poland. In the meantime, some changes were made to the regulations governing German fishing vessels, raising the allowable tonnage from 800gt to 1000gt, which made it possible to extent the new Kristin’s capacity before work had begun at the yard.
Operating company Kristin Fischereigesellschaft mbH is owned by a partnership based on the Swedish island of Donsö in the archipelago west of Gothenburg, with the three owners also sailing as Kristin’s skipper, mate and engineer.
Kristin’s hull was delivered to the Karstensen yard in Skagen in January this year and was completed ready for delivery in July.
Built to a Karstensen design, Kristin has a 53.55 metre overall length with a 11.20 metre moulded breadth and a 1080 cubic metre capacity in eight RSW tanks.
Kristin is expected to operate in both industrial and human consumption fisheries, fishing for sprat and sandeel for reduction and delivering catches of herring for production,
The strict quality requirements for both industrial and human consumption mean that a strong of focus has been placed on the RSW facilities, as well as on optimising working and living conditions, and coming up with an optimised operating profile to ensure minimal energy consumption.
Catches in the eight tanks are chilled by the double Johnson Controls (JCI), 2×700 kW/2×605,000 kCal/h RSW system. The vacuum pump system is from Önnereds Welding and has two 66kW compressor units and twin 2800 litre tanks.
Kristin’s power arrangement is in line with the thinking applied to recent Karstensens deliveries, working on the principle that the full propulsion power and full power to the winches are not needed at the same time.
Deck equipment is an all-electric MacGregor Rapp Marine system with 50 tonne trawl winches and a pair of 60 tonne net drums facing the hydraulic stern hatches and guide rods. Rapp Marine also supplied the 38 tonne tail-end winch, mooring and anchor winches, and the net sounder winch, as well as the two 16 inch electric fish pumps – a first for the region’s fleet – and the drums for the fish pump hose and power supply.
SeaQuest supplied the forward 4t/16m and the aft 4t/12m deck cranes.
The main engine is a 2309kW MaK 8M25 driving a 3800mm diameter Cat Propulsion (Berg) MPP850 propeller via a Reintjes LAF 4555 reduction gearbox, which has a PTO powering a 1200kW n AvK Cummins DSG 86 shaft generator which is intended as the primary power supply.
While fishing, with the electric winch system in largely continuous use, the PTO and shaft generator are engaged. When full power is needed for the winches, it is unlikely that there will be a need for full propulsion power, so the arrangement allows the main engine to serve as the power source for both propulsion and power supply, without the need to run auxiliaries.
In the event that there is a need for additional power to the propulsion system, then one of the two 400kWe Scania DI13 can supply the ship’s normal power supply as well as the winch system in towing mode.
As the electrical system is prepared for load-sharing/parallel coupling of the two generators, there is be a great deal of security built into the system, as these together are able to meet the vessel’s power requirement.