Flare Gas Recovery System - Crystal Tcs What is Flare Gas? Petroleum refineries, natural gas processing plants and oil and gas production sites, natural gas blends are produced from the following sources: Extraction of natural gas with oil from oil wells, Gas is formed above the liquid level in storage tanks High pressure crude to low pressure flashing. Crystal TCS Pvt. Ltd. has done in-depth research and development to come up with flare in flare gas recovery systems.