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Gulf Of Mexico Vessels Getting LNG Propulsion Equipment

Posted on October 7, 2011

Wärtsilä has received a contract to supply liquefied natural gas (LNG) propulsion equipment for two advanced offshore supply vessels owned by Harvey Gulf International Marine. These supply vessels, which will operate in the Gulf of Mexico, will be the first U.S. flagged platform supply vessels (PSV) to be powered by LNG, according to Wärtsilä. The contract includes options for supplying propulsion equipment for additional follow-on vessels.

Wärtsilä will deliver an integrated system that includes the dual-fuel machinery, electrical and automation package, complete propulsion, and also the LNG fuel storage and handling components. The STX Marine Inc SV310DF Offshore Support Vessels will be powered by Wärtsilä six-cylinder 34DF dual-fuel engines. The LNG storage capacity of 290 m3 enables more than a week of vessel operational time, the company said. In addition, the vessels will carry 5520 tons of deadweight at load line and have a transit speed of 13 knots. The vessels are scheduled for delivery in two years.

Wärtsilä is familiar with dual-fuel engine technology, allowing the same Wärtsilä 34DF engine to be operated on either gas or diesel fuel with full EPA emissions Tier 2 compliance. This dual-fuel capability means that when running in gas mode, the environmental impact is minimized since nitrogen oxides are reduced by about 85% compared to diesel operation, sulfur oxide emissions are completely eliminated because gas does not contain sulfur, and CO2 emissions are also lowered. Natural gas has no residuals, meaning that the production of particulates is non-existent, Wärtsilä said.

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