This contract was signed in late 2013 with Samsung Heavy Industries (SHI), which will build the FSU for Statoil.
Delivery of the Wärtsilä equipment is scheduled for spring 2015 and the FSU is expected to be in operation in 2017.
The scope of supply includes 45 deepwell process and cargo offloading pumps with electric motors and variable speed drive (VSD) panels, three fire water pump skids, and two ballast pumps.
"Wärtsilä has extensive experience in this market area, particularly with our electrically driven deepwell pumps. As a result, we can offer complete pumping solutions that are competitive in terms of both CAPEX and OPEX and which meet the demanding requirements of offshore operations." said Timo Koponen, vice president Wärtsilä Flow and Gas Solutions.
Statoil's Mariner field is the largest offshore development in UK waters and it is forecast to produce an average of 55,000 barrels of oil per day for some 30 years.
The new FSU will have a capacity of 850,000 bbls.
Last year, Wärtsilä won a contract to supply inert gas systems, deepwell pumps and fire water packages to a permanently moored FSU to serve the Heidrun oil and gas field.
In addition, Wärtsilä Moss inert gas systems will also be fitted on board two shuttle tankers that will support the FSU.
Crude oil output of the field will be loaded onto the FSU through subsea pipeline and underwater hoses. The oil will be shipped from the FSU to the shuttle tankers through offloading hose-strings.
Since its acquisition of Hamworthy in 2012, Wärtsilä has expanded its offering to the offshore oil & gas sector to include a complete range of liquid cargo handling products, including inert gas.