LNG storage tank
A liquefied natural gas storage tank or LNG storage tank is a specialized type of storage tank used for the storage of Liquefied Natural Gas. LNG storage tanks can be found in ground, above ground or in LNG carriers. The common characteristic of LNG Storage tanks is the ability to store LNG at the very low temperature of -162 °C (-260 °F). LNG storage tanks have double containers, where the inner contains LNG and the outer container contains insulation materials. The most common tank type is the full containment tank. Tanks are roughly 55 m (180 ft) high and 75 m (250 ft) in diameter (=250 000 m³).
In LNG storage tanks if LNG vapours are not released, the pressure and temperature within the tank will continue to rise. LNG is a cryogen, and is kept in its liquid state at very low temperatures. The temperature within the tank will remain constant if the pressure is kept constant by allowing the boil off gas to escape from the tank. This is known as auto-refrigeration.
The world's largest above-ground tank (Delivered in 2000) is the 180 million liters full containment type for Osaka Gas Co., Ltd. (2) The world's largest tank (Delivered in 2001) is the 200 million liters Membrane type for Toho Gas Co., Ltd.
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