Liquefied natural gas

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Liquefied natural gas (sometimes liquid natural gas, frequently LNG) is natural gas (predominantly methane, CH4, with some mixture of ethane, C2H6) that has been cooled to liquid form for ease and safety of non-pressurized storage or transport. It takes up approximately 1/600th the volume of natural gas in the gaseous state at standard temperature and pressure. LNG is odorless, colorless, non-toxic, and non-corrosive. Hazards include flammability after vaporization into a gaseous state, freezing and asphyxiation. The liquefaction process involves removal of certain components, such as dust, carbon dioxide, helium, water, and heavy hydrocarbons, which could cause process upsets downstream. The natural gas is then condensed into a liquid at close to atmospheric pressure by cooling it to approximately −162 °C (−260 °F); maximum transport pressure is set at around 127 kPa (18 psi), which is approximately 1.25 times atmospheric pressure at sea level. The gas stream is typically separated into...

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