Liquefied Natural Gas (LNG) factory Low temperature ASU liquid oxygen nitrogen air separation unit 1. Air compressor: Air is compressed at low pressure of 5-7 bar (0.5-0.7mpa) 2. Pre-cooling system: Cool the air temperature to about 12 degrees Celsius. 3. Air purifier: double molecular sieve dryer 4. Expander low temperature air cooling: The turbo expander cools the air temperature below -165 to -170 degrees Celsius. 5. The air separation column separates the liquid air into oxygen and nitrogen 6. Liquid oxygen/liquid nitrogen is stored in liquid storage tanks Liquefied Natural Gas (LNG) factory website:http://www.airseparatorunits.com/liquefied-natural-gas-lng/