Heel LNG is the LNG cargo retained in the cargo tanks on completion of discharge that is left in ship and shore storage tanks to maintain their cryogenic temperatures.

Reference Definition by Risk.net: Heel LNG is the small amount of liquefied natural gas (LNG) remaining on board a vessel (or storage) after discharge of the regular LNG cargo, it is used to insulate the LNG storage tanks and is also available as fuel for carrier ship. The heel is considered to exist both before and after discharge, as the minimum quantity of LNG necessary to be retained in holding tanks.

Related Definitions in the Project: The Plant and Process Unit