Answer»
- Natural gas can be reduced to liquid state by cooling to 160 C so that it will occupy 1/600th of its gaseous volume and it is called as Liquefied Natural Gas which eliminates more space for gas transportation. In fact during the process of liquefaction of NG to LNG lot of impurities are eliminated.
- Hence LNG is the purest form of Natural Gas.
- LNG is stored in LARGE INSULATED tanks that are specially designed for this purpose. The tanks are so-called “full containment” tanks. Each tank consists of a special nickel-steel inner tank and a (roughly 80-cm thick) concrete outer tank. The space between the walls of the two tanks is filled with a thick layer of special insulating material that ensures that virtually no HEAT can get into the inner tank. However, even with the most efficient insulation, some ambient heat will ALWAYS reach the inner tank. This slight quantity of heat will cause a very small amount of the LNG (approximately 0.065% a day) to turn back into a gas. All of this so-called evaporation loss in the tank is collected, so that none of it is released into the atmosphere. It is again condensed into LNG and added to the tank as LNG liquid. It may also be used at the terminal as a fuel to heat up the LNG.
- At receiving terminals (like Dahej, Hazira), LNG is re-gasified and transmitted for further usage in NG form. These receiving terminals are also known as Re-Gasification terminals
- LNG VESSELS (Ships) are also there to carry 2,50,000 m3 of Gas at a time
- In India we have LNG import-cum-re-gasification terminals and we do not have liquefaction plants, as India is not a gas-exporting nation.
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