ferry profile Boknafjord
The 7,500gt vessel is an updated design from its 4,325gt predecessors
development and design work by Multi Maritime. There is a lot of draught and the hull is slimmer than previous designs.” Hamburg’s HSVA hosted model testing. Mr Fiskerstrand added, “Fuel consumption and energy costs on this vessel are extremely low.” Mr Oksnes explained the evolution of the design,
“The initial regulations for building LNG-powered ferries were being written at the same time as the previous vessels were being designed. However, now the rules are not so strict because there is much more operational experience with LNG ferries and we have ironed out any problems.”
EQUIPMENT/OUTFIT Main engines Output Thrusters Lifesaving equipment
Fast rescue boat/davit Fire protection equipment Automation
Navigation equipment Sanitation system Toilets Lifts
Hull coating
Rolls-Royce Bergen C series, 3 x 9 cylinder C25:33L9A gas, 1 x diesel
3 x 2,310kW, 1 x 2,850kW
4 x Rolls-Royce AZP100 Azipull
2 x Brude 300-people MESs; 3 x 51-people liferafts
Noreq
Autronica Fire & Security Høglund Marine Automation Sigurd Solberg Aco Marine Evac
Schindler Stahl Heiser Hempel
20 I Passenger Ship Technology I Spring 2012
For instance, the two LNG tanks on the previous design were arranged as a pair in the centre of the vessel. On Boknafjord there is one at each end of the ferry. “The old design was connected to the former safety rules about gas ventilation, and each engine had to be enclosed in explosion-proof compartments,” said Mr Oksnes. “But we have a lot more open space with this current configuration and the philosophy is to have an inherently safe system. Now there is a double pipe gas system in the engines so that if there is a leakage in the inner pipe, the outer pipe will funnel this to a waste pipe on deck. However during the building period, the Norwegian Maritime Directorate opted to divert from national Norwegian rules and allowed the application of the standard IMO rules. This is also why the three gas- fuelled engines are placed in a separate compartment, even though this is no longer necessary.” There are three Rolls-Royce Bergen C25:33L9A gas engines on board and one Bergen C series diesel genset for ‘take me home’ purposes. “The diesel engine would not be allowed to be used in ordinary trade, it’s only for emergencies,” said Mr Oksnes. The gas engines deliver 2,310kW each and the diesel engine outputs 2,850kW. “To reach the 21-knot service speed, the previous ferries needed around 8,200kW, but these LNG engines should be able to do that by using only 6,000kW,” he added. In contrast to the Schottel thrusters on the previous ferries, Rolls-Royce supplied Azipulls for Boknafjord.
www.passengership.info
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