The ConocoPhillips Optimized Cascade ^SM Process is designed around a "two-train-in-one" reliability concept that has been successfully proven in more than 36 years of plant operation. This schematic illustrates the basic features of the process.

Natural gas is first treated to remove contaminants including CO₂, water and mercury. Next, the treated gas is chilled to approximately –260 degrees Fahrenheit in successively colder heat exchangers that use propane, ethylene and methane as refrigerants. Product leaving the methane exchangers is LNG ready for storage.

LNG product is pumped into insulated storage tanks. Gases continually boil out of the LNG as it warms slightly in the storage tank and these are captured and returned to the process for regasification and reliquefied.

The ConocoPhillips Optimized Cascade ^SM Process offers users several advantages:

• Proven proprietary technology
• High thermal efficiency
• Ease of start-up, shutdown and operation
• Improvements based on more than 35 years operating experience (Kenai, Alaska)
• Enhanced Natural Gas Liquids recovery options are available