Eidesvik Offshore’s 5-year old offshore supply vessel (OSV) Viking Princess has until recently been operating with four LNG-powered Wärtsilä engines, with engine loads varying between 90% and 20%. Now, with new Wärtsilä battery technology, it has returned to supply duties using three engines and a hybrid energy system, delivering significant environmental and economic benefits.
The Norwegian vessel is now the first ever offshore supply vessel in which batteries reduce the number of generators aboard the ship. The new energy storage solution will improve engine efficiency, generate fuel savings and reduce greenhouse gas emissions. Viking Princess completed sea trials and the system was handed over to customer Eidesvik Offshore on 9 October 2017.
There is significant potential to save fuel through improved engine efficiency, as the operating profile of supply vessels is highly variable. When using the Wärtsilä installed energy storage system on board Viking Princess, the fuel saving potential can be up to 30 percent in various operations and the CO2 emissions can be reduced by approximately 13–18 percent per year, depending on operational conditions and requirements.
Furthermore, the hybrid solution will provide a more optimal load on the engines, while the intervals between engine maintenance can be extended.
Viking Princess now runs on a combination of a battery pack for energy storage and three LNG-fuelled Wärtsilä engines. The new energy storage solution provides balancing energy to cover the demand peaks, resulting in a more stable load on the engines. The technology is similar to that used in hybrid vehicles: it prevents the engine load from dipping, and uses the surplus to re-energise the battery, which can be charged as needed. Wärtsilä’s remote monitoring and operational advisory services support the daily operation of the vessel ensuring efficient and optimised operations.
The contract to replace one of the four engines on Viking Princess with battery power was signed in May.
Future Impact for the shipping industry
“Eidesvik and Wärtsilä’s partnership dates back to 2003 when our ship, the Viking Energy became the first offshore supply vessel powered by LNG fuel. Now, together, we are again introducing a world’s first, with the Viking Princess becoming the first offshore vessel in which batteries reduce the number of generators aboard the ship. We are grateful to Wärtsilä for providing the technology to make this possible,” says Vermund Hjelland, President Technical Department, Eidesvik Offshore. Altogether, the company operates five LNG-fuelled OSVs.
“This is a truly forward-looking solution, and we congratulate Eidesvik Offshore for having the vision to appreciate the benefits that hybrid energy system offers. In addition to the fuel consumption and environmental advantages, the conversion also reduces maintenance costs and contributes to more efficient operations. The success of this project will impact the future of the entire shipping industry,” says Sindre Utne, Manager Projects and Operations, Wärtsilä Norway.
Source: Wärtsilä Corporation