MGO is replaced by LNG
Emissions of sulphur, NOx and particles reduced
There are several major environmental benefits of using LNG versus ordinary marine gas oil (MGO) which is common in other supply ships.
Barents NaturGass delivery to ENI NorwayENI Norways supply ship for the Goliat oil field, Stril Barents, is delivered and is operated by shipping company Simon Møkster Shipping. The vessel runs between Goliat and the supply base Polarbase in Hammerfest. When needed, the vessel is also used for other operations for ENI Norway. Barents NaturGass supplies LNG, to the vessel. This is usually done at Barents NaturGass’ bunkering plant at Polarbase.
DualFuel enginesWith Stril Barents chosen DualFuel enignes NOx-emissions is reduced by 85% and sulphur and particle emissions is nearly eliminated when the engines are operated on natural gas. CO2 emissions are reduced by approximately 10-15%.
A supply ship with DualFuel engines are slightly more expensive than regular vessels. With support from the NOx-fund for investments and strongly reduced NOx fee, the price difference is less. Even if the price on MGO (Marine gas oil) is low at the moment, it’s still economical beneficial to use LNG as fuel. With new environmental requirements coming in the next few years, the price of MGO will probably increase and the economic gain by running of LNG operations is maintained or strengthened.
The bunkering processThe vessel needs flexibility at the time of bunkering, and therefore continually informs Barents NaturGass when bunkering is needed. Crew from Polarbase/Barents NaturGass is responsible for bunkering on the land side and makes sure that the hose is connected between Barents NaturGass bunkering facility and the vessels bunkering station on the ship’s side. The bunkering facility has a pump capacity of approximately 90 tonnes per hour. Bunkering, including preparation and procedures, is done in 1-2 hours.
“For our shipping company, it is important to use an LNG supplier with great flexibility and delivery reliability” Anne Jorunn Møkster, CEO
Facts about DualFuel (DF) engines
The DF-engine runs on gas, ignited by diesel that is compressed and ignited in a front chamber. The diesel explosion ignites the gas in the main chamber. (No spark plugs)
The DF-engine can run on diesel if necessary. Some ship owners choose DF-engines so that the ship can be put in to traffic anywhere, regardless of logistics and LNG terminals.
The DF engine satisfies the DP2 requirements.
The DF engine qualifies as a “take me home”-engine, which is a propulsion system in case of failure on any of the parts in the gas system.
Data from Eni Norway
CO2 emissions reduced by
NOx- emissions reduced by
Sulphur and particle emissions reduced by
More information about the vessel
Supplyboat Stril Barents
More information about the customer
More information about Simon Møkster Shipping
Simon Møkster Shipping
“It was quite natural for ENI Norway to choose LNG and a DualFuel engine when we made plans for platform supply vessel for Goliat. Our choice gave us significantly reduced emissions, but without compromising on safety, flexibility and performance. The home port for the supply vessel is Hammerfest, so the LNG delivery is supplied locally. In our case, this further enhances the environmental benefits.”
Bjørn Bjørgve, Industrial coordinator, ENI Norge