Liquefied natural gas (LNG) is widely used as clean energy. Liquefaction of gases is a physical conversion of a gas into a liquid state. Main reason for such is to reduce its volume in order to transport in liquid state to customers' site. GreenFir owns a variety of self-developed natural gas liquefaction technologies, such as mixed refrigerant cycle (MRC) and N2 cycle. And GreenFir develops optimized single-stage mixed refrigeration (SMR), C3 pre-cooled mixed refrigeration (C3MR) and double mixed refrigeration (DMR) considering different cooling principles and working conditions. LNG plants are typically sized to produce from 20 to 730 tons per day of LNG.