Liquefied Natural Gas (LNG) is natural gas—predominantly methane (\(\text{CH}_{4}\))—that has been cooled down cryogenically to a liquid state at roughly –162°C (–260°F) for non-pressurised storage and long-distance transport. This extreme cooling process shrinks the volume of the gas by approximately 600 times, allowing massive quantities of energy to be efficiently loaded onto specialized ocean tankers and shipped worldwide where pipelines do not reach.

Core Properties & Characteristics

• Chemical Profile: It is colourless, odourless, non-toxic, and non-corrosive.

• Odorant Absence: Unlike domestic natural gas or LPG, no odorant (like sulfur compounds) is added to international LNG shipments. The extreme cold would cause the odorant to freeze out of the liquid.

• Vapour Density: At room temperature, natural gas is lighter than air. If LNG leaks and warms up, it quickly vaporises and rises into the atmosphere rather than pooling on the ground.

1. Production: Natural gas is extracted from the ground and stripped of impurities like water, carbon dioxide, and heavy hydrocarbons.

2. Liquefaction: The purified gas enters a refrigeration unit where it is chilled down to –162°C until it turns into a liquid.

3. Shipping: It is loaded into heavily insulated, double-hulled vessels called LNG carriers that act like giant thermos flasks to keep the product frozen during ocean voyages.

4. Regasification: Upon arriving at its destination terminal, the liquid is pumped through ambient vaporisers to heat it back up into standard gaseous natural gas, which is then fed into regional pipeline networks.

The LNG Supply Chain

Safety & Environmental Profiles

• No Ground Contamination: Because it evaporates instantly if exposed to ambient air, an LNG spill cannot pollute oceans, rivers, or soil.

• Flammability Limits: The liquid itself does not burn. Only the vaporised gas is flammable, and only when mixed with air in a narrow concentration range of 5% to 15%.

• Rapid Phase Transition (RPT): If large volumes of LNG contact water rapidly, the sudden influx of heat causes an explosive expansion into gas. This is a physical phase change explosion rather than a chemical combustion reaction.

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