Bunkers are designed to supply vessels with liquefied natural gas (LNG) when moored or in seaways. They are equipped to pump LNG to a bunkered vessel and are able to meter LNG pumped.
Project 16001 LNG bunkers
Project 18005 LNG bunkers
In nature, LNG bunkers are specialized tankers. Usually they are specially built ships. However, vessels are sometimes modernised for these purposes intended for others due to different circumstances.