Boknafjord ferry profile
Experience allows LNG ferry design freedom
Currently the largest LNG-powered ferry in the world, the energy efficient and economic Boknafjord represents the evolution of a proven design
F
jord1 Fylkesbaatane’s latest double-ended ferry is a departure from its previous five LNG-powered newbuilds. The double-ended
129.9m-long Boknafjord is not only slightly longer than its 128.8m predecessors (Bergensfjord, Fanafjord, Raunefjord, Stavangerfjord and Mastrafjord), the configurations of the engines, gas tanks and other technical systems are also different. In December the 7,500gt vessel was delivered
from Fiskerstrand shipyard in Ålesund, Norway, for operation in the Bokna Fjord between Arsvågen and Mortavika, in the south of the country. It will also function as a spare vessel for a more northerly route between Halhjem and Sandvikvåg. The Arsvågen to Mortavika route is essentially part of Norway’s E39, the main road between Stavanger and Bergen. Boknafjord was required due to the growing traffic
BOKNAFJORD
Owner Builder
Designer Length, oa
Breadth, moulded Draught, scantling Gross tonnage Deadweight Speed
Passenger capacity Vehicle capacity Class
Fjord1
Fiskerstrand BLRT Multi Maritime 129.9m 18.8m 5.0m
7,500gt
1,310 dwt 20.5 knots 600
396 lane metres/242 cars DNV +1A1, Car Ferry A Gas
Fuelled, Clean, RPS, E0, R3 (NOR)
www.passengership.info
on this southern route, totalling around 5 million passengers annually. The southern route faces rougher weather conditions, so a voyage time of 22 minutes is achieved by sailing at 17 knots. An anti-roll tank has been installed to help the vessel cope with these conditions. Boknafjord has to abide by Norwegian Maritime Directorate regulation 305, which states that when domestic passenger ships sail in rough weather, they can venture no more than 25nm from the coast. The northern route has calmer waters, so if the ferry is deployed there, the 45-minute journey can be completed at an average speed of 21 knots. The previous series was built by the then
Aker Yards Søviknes yard between 2006 and 2007 and designed by LMG Marin, whereas this sixth similar-sized vessel is built to a Multi Maritime design. Multi Maritime has actually been part of the Fiskerstrand group of companies since its purchase in 2010, although the yard has worked with these naval architects since 1995. Fiskerstrand BLRT itself is a joint venture
between Fiskerstrand Verft and Western Shipyard in Klaipeda, Lithuania. This meant that Boknafjord’s hull was built in Klaipeda, then towed to Ålesund last July. Rolf Fiskerstrand, chief executive officer of Fiskerstrand BLRT explained, “It is more economical to build a hull there and they have very good premises for carrying out this kind of work. We have very good co-operation with them. Maybe our package was not the cheapest, but when Fjord1 evaluated the concept and design and the ability to deliver in good time, we won the contract.” Fiskerstrand Verft’s project director, Stein Oksnes, commented, “The main target for Fjord1 in building this new ferry is to maintain the speed and increase load capacity by 30 cars (total accommodation is 600 passengers and 242 cars) and simultaneously reduce the fuel consumption by 20 per cent or more. This target was achieved through 18 months of careful hull
Passenger Ship Technology I Spring 2012 I 19
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