Build 126, which is a platform supply vessel of the Havyard 833 WE ICE type, is also a result of Havyard's strong focus on operating economy and the environment. Arve Helsem Leine, Design Manager at Havyard Design & Solutions, says that it is profitable to invest in R&D that focuses on environmentally friendly products. 'In order to achieve sustainable development, you have to think about the environment,' says Design Manager Leine.'The offshore oil industry has also focused on the environment for a long time, and this puts pressure on us to continue to develop environmentally friendly solutions. The Havyard 833 WE ICE design that we will deliver to Fafnir is an excellent example of this. When we developed the first WE design, the challenge was to push the envelope in terms of designing a ship that would use even less fuel under actual operating conditions, thereby reducing harmful emissions to the natural environment.
The idea behind a hybrid battery-powered diesel-electric propulsion system is the same as for hybrid cars: to produce energy as efficiently as possible, while having access to power when it is needed.
The energy requirements of a typical PSV will vary greatly, depending on what operations it carries out. In a conventional diesel-electric propulsion system, the load on the diesel generators will vary in step with variations in the energy needs. As a result, the diesel engines cannot constantly operate within a load range where their fuel consumption is as low as possible. With hybrid battery power, the diesel generators can be run at optimum load all the time. When the power needs vary, the batteries can be charged or power drawn from them depending on whether the power need is lower or higher than the capacity of the diesel generators that are in operation.
The response time when the power need varies is also much shorter, which means that power can be directed more quickly to the vessel's propellers and thrusters to ensure even more precise and safe positioning, for example during operations near offshore rigs.
Norwegian Electric Systems has developed and deliver a QUEST® 2 (Quadro Energy Storage Technology) battery system for the vessel, which will be the first vessel to be equipped with this system. The battery pack supplies power to the main switchboards via an AC / DC converter.
'Installing our QUEST® system on the vessel will reduce emissions and save fuel and money,Battery technology is developing rapidly, and capacity and output are improving in relation to volume and weight all the time. This shows that we are on the right track with our hybrid electric systems.' says Jan Berg, EVP Business Development at Norwegian Electric Systems.
The combination of the Havyard 833 WE ICE hull design and hybrid battery power result in a PSV that will use between 30 and 40% less fuel than traditional PSVs during certain operations. This will also lead to a corresponding reduction in emissions of environmentally harmful gases such as CO2, NOx and SOx.
Key data, Havyard 833 WE ICE
Length: 89.70 m
Breadth: 19.60 m
Speed: 15 knots
Deck area: 1,000 square metres
Crew: 25 persons
Deadweight: 4,250 tonnes