This interactive training unit is designed to introduce trainees to some of the basic principles of refrigeration system operation, details explanation of mechanical refrigeration system cycle components (surge drum, expansion valve, chiller, refrigeration compressor, and condenser), and to conduct design, operation, control system, maintenance, improve efficiency and troubleshooting of refrigeration system for natural gas processing. After completing this unit, trainees should be able to have knowledgeable and real experience field of natural gas propane refrigeration system plant.