LNG Reliquefaction Systems

Wärtsilä has by far the highest number of BOG reliquefaction plants installed in the global LNG carrier fleet. They offer owners and operators unsurpassed lifecycle efficiency, and are backed by a full range of complementary services, including operation & maintenance training, remote monitoring & diagnostics, and customized service and support agreements.

Wärtsilä Oil & Gas Systems has commercialised and improved the reliquefaction technology since it was originally patented by Kværner and licensed by Hamworthy in the late 1990s. Our boil-off gas (BOG) reliquefaction plants have been installed on numerous vessels, including the entire Q-Flex fleet of 216,000m3 LNG carriers. The 31 Wärtsilä Hamworthy LNG BOG reliquefaction plants delivered to the Q-Flex fleet are installed on ships driven by slow speed diesel propulsion engines. The process is based on the reversed nitrogen Brayton cycle refrigeration technology, combined with a process solution for separating nitrogen from the BOG. We have also delivered the same type of systems to a number of LNG carriers with dual-fuel diesel electric (DFDE) propulsion. The liquefaction of BOG on LNG carriers results in increased cargo deliveries, and allows owners and operators to choose the most optimal propulsion system and operating profile.

We work closely with our customers to develop technological solutions that meet their needs for increased fuel flexibility, energy efficiency, and environmental performance in today’s fast changing LNG market.