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Siem Offshore orders additional PSVs from Wärtsilä

LNG Industry,

Siem Offshore has contracted Wärtsilä to supply the design and integrated solutions for a further four platform supply vessels (PSVs) to operate primarily on liquefied natural gas (LNG).

This contract, signed in January 2014, follows similar orders placed by Siem Offshore in November 2012 and August 2013. The ships will be built at the Remontowa Shipbuilding yard in Poland.

Dual fuel propulsion

The four new vessels will use the Wärtsilä VS 4411 DF ship design and will have Wärtsilä dual fuel propulsion allowing them to operate primarily on LNG. Benefits of the integrated Wärtsilä systems, combined with an optimised hull design, include:

  • Lower fuel consumption.
  • Reduced fuel costs.
  • Fewer exhaust emissions compared to vessels running on conventional marine fuel.

Wärtsilä will also supply the complete diesel electric system, the Wärtsilä LNGPac gas storage and handling system, and the complete electrical and automation system, including a four-split Wärtsilä LLC (Low Loss Concept) solution. The Wärtsilä LLC will enable the vessels to fulfill the highest possible Environmental Regularity Number (ERN) of 99.99.99. The ERN rating represents the capability of a vessel to maintain its position and normal operations under certain weather conditions.


Wärtsilä Solutions VP, Magnus Miemois, commented: "This repeat order emphasises again the efficiency and customer benefits of Wärtsilä's unique position as a total solutions provider. These PSVs will often be working in challenging sea conditions, and in areas where strict emissions regulations are in place. Our integrated systems solution and dual-fuel technology that allows the ships to run on clean LNG fuel, enable such challenges to be met and overcome".

Vessel specifications

  • Length – 89 m
  • Beam – 19 m
  • Deck area – 970 m2
  • Capacity – 5500 dwt

The vessels are due for delivery between Q3 2015 and Q2 2016.

Adapted from press release by Katie Woodward

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