The Cemre Shipyard in Turkey has floated off the latest pelagic vessel heading for the Norwegian fleet, the highly innovative Selvåg Senior.
The 79.50 metre by 16.20 metre breadth Selvåg Senior is a Skipsteknisk ST-136LNG design incorporating a vertical gas tank with a volume of 350 cubic metres in the forward section. This option provides excellent use of space, affecting the vessel’s dimensions less than if a conventional horizontal tank arrangement had been chosen.
As liquefied natural gas has to be stored at a temperature of approximately -160°C and needs to be heated to ambient temperature to become a gas that the main engine can use, sophisticated management system will utilise excess heat energy from this process to power the RSW system, while excess exhaust heat is to be recovered and converted to electrical power, all of which technology is designed to ensure minimal energy wastage.
The LNG installation is backed up by a 1mW/hour battery pack, which will replace many of the usual functions of diesel gensets, while also flattening the main engine’s energy requirement curve, plus providing power in dock. Selvåg Senior is also designed to be linked to a climate neutral shore supply when in port to charge the battery pack.
The ship’s electrical platform is based on a DC-grid arrangement that provides full flexibility in utilising the main engine over its entire speed range. It can most easily be described as an automatic and more efficient handling of the ship’s changing operating pattern and this will also have major impacts on propeller optimisation.
All these measures will lead to a reduction in emissions on a scale that is new to the fishing industry, reducing emissions of greenhouse gases by an estimated 42% compared to a similar new vessel built with conventional technology.
Rigged to operate as a purse seiner/pelagic trawler, Selvåg Senior will have all-electric pumps and winch systems, with capacity to re-route energy to the battery pack.
Selvåg Senior is designed to have a 2500 cubic metre capacity in 12 RSW tanks.
The owners of Selvåg Senior and designers Skipstenkisk have been involved in a number of extensive collaborative efforts with research body SINTEF to achieve optimum cooling and circulation in the RSW tanks.