Wärtsilä has won a contract from US-based Harvey Gulf International Marine to supply a liquefied natural gas (LNG) propulsion system to two advanced offshore supply vessels (PSV).

The Finnish company will supply an integrated system that includes dual-fuel machinery, an electrical and automation package, complete propulsion and the LNG fuel storage and handling components.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

According to Wärtsilä, the STX Marine-built SV310DF offshore support vessels will be the first ever US-flagged PSV to be powered by clean, safe and efficient LNG via Wärtsilä’s six-cylinder 34DF dual-fuel engines.

The vessel will have an LNG storage capacity of 290m3, enabling the vessel to operate over more than a week.

They will have a capacity of 5520dwt, a transit speed of 13kt and are scheduled for delivery in two years.

The contract includes options to supply propulsion equipment for additional follow-on vessels.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

Ship Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Ship Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Recognised with Innovation and Product Launches awards in the 2025 Ship Technology Excellence Awards, BASSnet Neo is BASS Software’s future-ready maritime ERP. See how its cloud architecture, AI automation and integrated BI dashboards are transforming operational control for ship owners and managers.

Discover the Impact