LNG: Liquefied Natural Gas
LNG is the liquefied form of CNG. The storage tank pressures are much lower and the methane gas
are kept in liquid form. This is manufacutred by chilling the natural
gas to -162°C and maintained in liquid state in a thermal storage tank.
The gas is stored in a very simliar nature to liquid nitrogen or liquid
oxygen, at a much lower in pressure of around 350 Psig.
The thermal capacity of liquid methane yields a much higher energy
level then CNG. With pure methane, the thermal energy it yields is 2.7 times of CNG.
With a higher thermal energy, it allows vehicles operating on LNG to extend
their range between refueling. Normal gasoline that we now use at Petrol Stations is
110,000 BTU per Gallon whilst LNG is about 75,000 Btu per Gallon.