The Boil Off Gas (BOG) is the continuously evaporated or boiled LNG vapor that causes the pressure inside the tank to rise due to heat entering the cryogenic tank during storage and transportation, which changes the quality of LNG over time. This BOG is generated primarily due to heat leakage from the atmosphere through tank insulation, loading, unloading and recirculation pipeline system insulation, and it is re-routed through a boil off gas refrigeration compressor and re-pressurized for designated service to the storage tank or other utility systems.

Related Definitions in the Project: The Plant and Process Unit