Havyard has signed a contract for the construction of a Havyard 833 WE ICE platform supply vessel with Fafnir Offshore HF. The greatest innovation onboard the vessel is that it will be equipped with a hybrid battery powered diesel-electric propulsion system.
"When we develop a new ship design we have two main focal points - those are the customer`s demands in relation to the ship`s operational needs and area of operation and also to use the latest accessible technology and research tools in order to make the ship as efficient as possible. We have invested a lot in our design philosophy and in our calculation tools and methods for testing. We also work closely with key suppliers in developing good solutions for our designs and hybrid battery power is a good example of this, says Arve Helsem Leine, Design Manager of Havyard Design & Solutions." says Arve Helsem Leine, Design Manager of Havyard Design & Solutions
A typical PSV has large variations within its energy needs depending on the operation being carried out. Going from A to B demands a certain need for energy and a different need is created when it is operating by an oil rig. Weather and wind conditions, waves and currents, also play their part in the swift variations of energy requirements. "In traditional diesel-electric propulsion systems the diesel generators` load will vary according to the alternating energy needs", adds Leine. "This means that diesel engines cannot constantly operate within a load area where these engines have the lowest possible fuel consumption."
With hybrid battery power you can constantly operate diesel generators at an optimal level. When energy demands vary you can either charge or discharge batteries, depending on whether the energy demands are lower or higher than the capacity of diesel generators in operation. Response time in relation to variation in power demands is also a lot shorter, so there is a quicker transfer of power to the ship`s thrusters which ensures a more precise and secure positioning, for example in operations by an offshore rig.
The hybrid system for this ship is developed in close cooperation with Norwegian Electric Systems. This hull design combined with hybrid battery power ensure that a PSV in given operations uses 30 to 40% less fuel compared to a traditional PSV, says the Design Manager. Delivery is expected in July 2015.
Top image: Havyard