LNG in shipping – Wärtsilä’s leadership in practice

Sustainability assured 2011Wärtsilä, the marine industry's leading gas solutions provider, has been able to expand its offering to various shipping segments. Wärtsilä is focused on developing gas power technology, which increases the flexibility, lowers the operational costs, and reduces the environmental impacts of shipping. During 2011, new milestones have been reached in this field.

First U.S. flagged LNG offshore vessels

Wärtsilä will deliver liquefied natural gas (LNG) propulsion equipment for two advanced offshore supply vessels owned by Harvey Gulf International Marine. These supply vessels will be the first ever U.S. flagged platform supply vessels (PSV) to be powered by clean, safe and efficient LNG.

Wärtsilä will deliver an integrated system that includes the dual-fuel machinery, electrical and automation package, complete propulsion, and also the LNG fuel storage and handling components. The STX Marine Inc SV310DF Offshore Support Vessels will be powered by 6-cylinder Wärtsilä 34DF dual-fuel engines. The LNG storage capacity of 290 cubic meters (m3) enables more than a week of vessel operational time.

LNG powered Platform Supply Vessels

Wärtsilä supplies design and propulsion solutions for LNG fuelled PSV's. Norwegian operator Eidesvik Offshore has placed an order for its fifth gas PSV (VS489). All of Eidesvik's gas PSVs, including this latest order, have been designed by Wärtsilä, and they utilise Wärtsilä's unique dual-fuel technology.

Wärtsilä has been contracted by Kleven Maritime of Norway to design a new LNG powered PSV for Norwegian operator Rem Offshore. The scope of the order also includes the propulsion machinery, which is based on a combination comprising the Low Loss Concept system for Electric Propulsion, Wärtsilä 34DF main engines and the recently introduced Wärtsilä 20DF engine, as well as automation and other equipment for the same vessel. Rem Offshore’s new LNG powered PSV, the first such vessel for its fleet, will be a Wärtsilä Ship Design VS499 LNG PSV, a state-of-the-art vessel based originally on the successful VS489 LNG PSV design. The ship features outstanding energy efficiency, a unique hull form, fuel flexibility, and exceptional performance in areas such as fuel economy and cargo capacity.

Wärtsilä Ship Design is constantly working to ensure that its designs offer maximum efficiency, reliability and environmental performance. The company’s latest development within LNG PSV’s is the VS4410 DF-PSV. This PSV is equipped with the Wärtsilä Low Loss Concept system, which ensures not only safer operations, but also a high level of redundancy in the auxiliary system. As a result the vessel has been awarded the highest possible Environmental Regularity Number (ERN) score of The optimal choice of installed power is achieved with four Wärtsilä 9L20 engines. In combination with LNG as the main fuel, new standards in low emissions can be set for the global fleet.

2-Stroke gas engines soon available

New 2-stroke gas engine technology has successfully been tested. The new RTX5 low-speed test engine is part of Wärtsilä’s 2-stroke dual-fuel gas engine technology development programme. This is an important part of Wärtsilä’s strategy to lower emissions, increase efficiency, and to develop its low-speed engine portfolio to include dual-fuel gas engines alongside its medium-speed dual-fuel engines. The strategy serves to meet the needs of our customers.

Stronger growth platform for gas applications

The recent acquisition of Hamworthy has complemented Wärtsilä’s competencies in marine gas applications. This has strengthened Wärtsilä’s offering, especially in highly advanced and established systems for the onboard storing and handling of fuel gas.


Wärtsilä’s LNG technology offering in a nutshell
Products and solutions
Leading ship designer in gas fuelled OSVs
Widest power range in gas fuelled engines
    W20DF (1-1.5 MW)
    W34DF (2.7-9 MW)
    W50DF (5.8-17.5 MW)
    Electrical and Mechanical propulsion
    2-stroke DF under on-going development
Fuel system on board
    Bunkering connection
    LNGpac: fuel handling, storage and evaporating unit
    Gas valve unit (space saving enclosed design)
Propulsion and automation
10 ship designs
    89 vessels
    353 vessels
    17 vessels
    87 engines
Cruise and ferry
    1+1 vessels
    4 engines per vessel
Gas conversions
    1 chemical tanker
    2 engine conversions
1.5 million running hours with DF technology and over 3 million running hours in total with gas
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