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A liquefied natural gas storage tank or LNG storage tank is a specialized type of storage tank used for the storage of 
In-ground LNG tanks are also used; these are lined or unlined tanks beneath ground level. The low temperature of the LNG freezes the soil and provides effective containment. The tank is sealed with an aluminium alloy roof at ground level. Historically there have been problems with some unlined tanks with the escape of LNG into fissures, the gradual expansion of extent of the frozen ground, and ice heave which have limited the operational capability of in-ground tanks. All piping connected to the LNG tanks, whether above ground or in-ground, are routed through the top of the vessel. This mitigates against loss of containment in the event off a piping breach.
In LNG storage the pressure and temperature within the tank will continue to rise. LNG is a
Liquefied Natural Gas
Liquefied natural gas (LNG) is natural gas (predominantly methane, CH4, with some mixture of ethane, C2H6) that has been cooled down to liquid form for ease and safety of non-pressurized storage or transport. It takes up about 1/600th the vol ...
. LNG storage tanks can be found in ground, above ground or in LNG carrier
An LNG carrier is a tank ship designed for transporting liquefied natural gas (LNG).
History
The first LNG carrier '' Methane Pioneer'' () carrying , classed by Bureau Veritas, left the Calcasieu River on the Louisiana Gulf coast on 25 January ...
s. 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 vary greatly in size, depending on usage.
In-ground LNG tanks are also used; these are lined or unlined tanks beneath ground level. The low temperature of the LNG freezes the soil and provides effective containment. The tank is sealed with an aluminium alloy roof at ground level. Historically there have been problems with some unlined tanks with the escape of LNG into fissures, the gradual expansion of extent of the frozen ground, and ice heave which have limited the operational capability of in-ground tanks. All piping connected to the LNG tanks, whether above ground or in-ground, are routed through the top of the vessel. This mitigates against loss of containment in the event off a piping breach.
In LNG storage the pressure and temperature within the tank will continue to rise. LNG is a cryogen
In physics, cryogenics is the production and behaviour of materials at very low temperatures.
The 13th IIR International Congress of Refrigeration (held in Washington DC in 1971) endorsed a universal definition of “cryogenics” and “cr ...
, 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.
See also
*Liquefied natural gas terminal
A liquefied natural gas terminal is a facility for managing the import and/or export of liquefied natural gas (LNG). It comprises equipment for loading and unloading of LNG cargo to/from ocean-going tankers, for transfer across the site, liquefac ...
References
Storage Storage tanks {{petroleum-stub