Vapor recovery is also used in the chemical process industry to remove and recover vapors from storage tanks. The vapors are usually either environmentally hazardous, or valuable. The process consists of a closed venting system from the storage tank
ullage space to a vapor recovery unit which will recover the vapors for return to the process or destroy them, usually by oxidation. Vapor recovery towers are also used in the oil and gas industry to provide flash gas recovery at near
atmospheric pressure without the chance of oxygen ingress at the top of the storage tanks. The ability to create the vapor flash inside the tower often reduces
storage tank emissions to less than six tons per year, exempting the tank battery from Quad O reporting requirements. The identifiable benefits from an organizational stand point behind vapor recovery is that it helps to make the industry more sustainable and creates a pipeline for pumping exhausts back into production. ==See also==