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Combined System For LNG Carriers

Ships will aid U.S. natural gas export; concept of combining systems developed by Wärtsilä, DSME

Posted on July 3, 2013

Wärtsilä, a marine industry solutions and services provider, has been contracted to supply a combined inert gas generator and gas combustion unit for two new liquefied natural gas (LNG) carriers being built at the DSME yard in South Korea.

Delivery of the Wärtsilä equipment is scheduled to begin in autumn 2014. The new 173 400 m3 vessels will be among the largest LNG carriers capable of using the expanded Panama Canal, aiding the export of natural gas from the U.S.A. The ships will be owned by Canada-based Teekay Corp., one of the world's largest marine energy transportation, storage and production companies.

This is the first time ever that Wärtsilä's inert gas generator has been combined with the company's gas combustion unit to form an integrated total solution, the company said.

The concept of combining the two systems was developed by Wärtsilä in cooperation with DSME, and the system burns the boil off gas using an already existing Wärtsilä Moss inert gas generator. This eliminates the need for a conventional gas combustion unit, thus providing capital expenditure savings for the customer, the company said.

Inert gas generator systems are used to prevent the gas mixture in cargo tanks or bunkers from reaching a range where explosions could occur. Inert gas maintains the oxygen content of the tank atmosphere below 8%, making the air and hydrocarbon gas mixture in the tank too lean to ignite.

Nitrogen generators are then used to supply dry air and oil-free inert gas for purging, pressurizing and blanketing functions.