The company will also supply inert gas systems to another two shuttle tankers, which will support the FSU.
Inert gas generator systems will be used to avoid the mixing of gases in cargo tanks or bunkers to prevent a range of explosions.
Samsung Heavy Industries (SHI) will build three vessels in South Korea, under a contract signed with Wärtsilä in February 2013, while the equipment is expected to deliver in October 2013.
Wärtsilä Ship Power vice president Juha Kytölä said, "Wärtsilä is the market leader in the supply of inert gas systems to the offshore industry, where the technical specifications are extremely high."