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Offshore Support Journal

Offshore Support Journal

Dual-fuel vessels find work in North Sea and ‘Down Under’

Tue 13 Sep 2016

Dual-fuel vessels find work in North Sea and ‘Down Under’
Siem Pride is the second of what will eventually be a class of five dual-fuel PSVs operated by Siem Offshore

Siem Offshore is one of a number of owners to have ordered environmentally friendly dual-fuel platform supply vessels – two of five it contracted for have been delivered, and a third has been contracted to work in Australian waters starting in 2017

Early 2015 saw Siem Offshore accept delivery of its newbuild dual-fuel platform supply vessel (PSV) Siem Symphony from Hellesøy Verft Shipyard in Norway. The vessel, the first of what will be a total of five units of this type for the Norwegian owner, started work in the Norwegian offshore market.

Built to Wärtsilä’s VS 4411 DF design, Siem Symphony and sisterships can be powered by environmentally friendly liquefied natural gas (LNG) or marine diesel oil. The vessel has an overall length of 89.2m, breadth of 19.0m, a cargo deck area of 980m² and a maximum deadweight of 5,500 tonnes. Among other features, it has cargo capacities for 1,980m³ of drill water, 830m³ of fresh water, 930m³ of liquid mud, 700m³ of brine and 345m³ of methanol. The vessel is classed by DNV GL and has an accommodation capacity for 25 people. It came equipped with FiFi 2, NOFO 2009 and standby/rescue capacity for 300 people. Siem Symphony started work for Total Norge for a period of four years firm plus four one-year options, supporting Total’s operations at the Martin Linge field in the North Sea

With the various Wärtsilä systems having been integrated into a total solution and with an optimised hull design, the vessels will feature lower fuel consumption, reduced fuel costs and fewer exhaust emissions compared to vessels running on conventional marine fuel. Wärtsilä was also made responsible for 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 Low Loss Concept (LLC) solution. The Wärtsilä LLC will enable the vessels to fulfil 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 is the first supplier capable of providing such a high ERN.

November 2015 saw Remontowa Shipbuilding, part of Remontowa Holding, deliver the second ship in the series of dual-fuel PSVs, Siem Pride, which was contracted to work on a Shell field in the North Sea. Siem Pride has an active heave compensated crane fitted for launch and recovery of remotely operated vehicles. It also has a safe hose operation system and is a class DP2 dynamic positioning vessel.

More recently, through its wholly owned subsidiary Siem Offshore Australia Pty Ltd, Siem Offshore was awarded a charter contract for a third dual-fuel PSV by Woodside Energy Ltd in Australia. The duration of the charter is five years plus two options each of one year and is expected to commence in early 2017.

“This contract represents a significant milestone for both parties in terms of the commitment to Australia and the Asia-Pacific region for Siem Offshore,” said the Norwegian owner. “It is a significant step towards sustainable transportation on behalf of Woodside, given the environmental benefits of LNG as the primary fuel source.” The vessel will operate as part of the Woodside Integrated Fleet working offshore Dampier, Western Australia. Three more vessels of the same type – Siem Harmony, Siem Melody and Siem Rhapsody – were originally due to have been delivered this year.

In recent financial statements, Siem Offshore said the North Sea spot market improved a little towards the end of second quarter but primarily as a result of rates for anchor handling tug  supply vessels rather than PSVs. The company said it believes that the market will remain volatile for anchor handlers and PSVs “for an extended period”. It is not known whether the remaining dual-fuel PSVs on order for the company have contracts or if delivery has been delayed.

Siem Symphony  
Owner Siem Offshore
Designer Wärtsilä 
Yard Hellesøy Verft
Design VS 4411 DF
Length oa 89.2m
Breadth 19.0m
Draught 7.4m
Deadweight 5,500 tonnes
Accommodation 25
Cargo deck 980m2

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