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THE ENVIRONMENTAL SHIP "SELVÅG SENIOR"

The company Selvåg Senior AS from Meløy has signed a contract with the Turkish shipyard Cemre Shipyard for the construction of a state-of-the-art combined purse seiner/pelagic trawler, packed with new and environmentally friendly technology.

The design is developed in close cooperation and over a long period of time between the ship owner and the ship designers. This is the first new building of the designation ST-136 LNG and is the second time Skipsteknisk designs a new vessel for the shipping company Selvåg Senior. Although today's existing boat and the new one are both designed by Skipsteknisk – the similarities stop here.

In the foreship, a newly developed vertical gas tank of large diameter with a volume of 350m3 will be installed. Liquid natural gas (LNG) becomes the ship's primary energy carrier. The vertical gas tank is located in the foreship – an area that is often challenging to exploit to the fullest on this type of vessels. This leads to a very good utilisation of space, which in turn means that the vessel's main dimensions are not affected as much as if the tank were to be built as a more traditional horizontal  tank. The new building will have an overall length of 79.5 meters and a beam of 16.2 meters.

Liquefied natural gas keeps a temperature of about -140°C to -160°C and must be heated to gas form in order to function as fuel. A cold recovery system will use the surplus energy from heating the gas to maintaining the refrigerated seawater (RSW) in the cargo tanks.

The surplus heat from the exhaust should be recycled and converted to produce clean electricity. The new Selvåg Senior becomes the first newly built fishing vessel in the world to adopt this technology!
In short, minimal energy will go to waste.

A battery pack of 1 MWh will be installed. The battery pack in many ways replaces a diesel-powered auxiliary engine and will help to flatten the load on the main engine during voyage and also be a power source at port. At port, the ship are able to reveive high capacity of el-power from the land powergrid when charging its battery pack. The ship's electric platform is based on a "DC grid" solution that provides full flexibility in utilizing the main engine throughout its Rpm range. It can be described as an automatic and more efficient handling of the ship's alternating operating pattern and will also have major impacts on the optimization of the propeller.

All these measures will lead to a low carbon footprint and a reduction in emissions that the fishing industry has never seen before. In total, all measures will account for an overall reduction of greenhouse gas emissions of as much as 42% compared to whether the new Selvåg Senior would be built with conventional technology.

The new building will be equipped for pelagic trawling and purse seining with pumping both over the side and the aft. All winches and fish pumps will be electrical driven and return effects will go to the battery bank.

Both the shipping company and the designer have been involved in several cooperations with the Norwegian research institute SINTEF to achieve the best possible circulation and cooling of the cargo tanks. This is an experience that will come in handy in the design of the 12 tanks that will have a total volume of 2500.m^3.

Skipsteknisk AS appreciates the cooperation we have had with the shipowner for a number of years. Selvåg Senior AS's active involvement has been crucial throughout the development process that is now behind the new building. We look forward to following the construction process together with the shipowners, shipyards and suppliers!

Contact persons:

Inge Bertil Straume
Sales Manager, Fishing vessels
ibs@skipsteknisk.no

Tore Sæten Opsvik
Designer
tso@skipsteknisk.no