An LNG plant is highly energy-intensive and refrigeration section is the main consumer of energy. The operational flexibility and efficiency of the refrigeration section are critical to the overall efficiency of the LNG plant. Main cryogenic heat exchanger or MCHE is the heart of the refrigeration section and is the most important heat-transfer equipment in a base-load LNG plant. It cools and liquefies natural gas to –162 C. For process optimization, we need to look from an integrated point of view and MCHE is one of the most critical equipment in LNG process.