It is liquefied using a cryogenic process.
It is only lightly pressurised, at less than 10 kPa.
LNG – liquefied natural gas – is methane (CH4) that is liquefied by chilling below -161°C.
This the same natural gas that is piped to homes and businesses.
As liquid, the volume of LNG reduce to 1/600 its gaseous state.
This makes LNG transportable in cryogenic ships or trucks.
After regasification, it reverts to and is used as natural gas.
(Pictured is LNG storage with heat exchangers for regasification)
Storage pressure in these tanks is very low, at less than 10 kPa.
The liquid is stored at its boiling point for the pressure at which it is stored (atmospheric pressure).
As the vapour boils off, heat for the phase change cools the remaining liquid.
As the insulation is very efficient, only a relatively small amount of boil off is necessary to maintain the desired temperature.
This occurrence is known as auto-refrigeration.
The boil-off gas is not wasted, as it is used as a fuel source.
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