PSA stands for Pressure Swing Adsorption. PSA Oxygen Plant produces Oxygen from atmospheric air through adsorption of Nitrogen Gas & other gases from the air streams in adsorption vessels. Oxygen gas is let off by the adsorption bed & is collected as product gas. To have the continuous operation of the plant, it has two adsorption beds, which operate alternatively. While one adsorption bed is in operation, another bed is under regeneration. Due to the swing operation of the adsorption bed, the plant is known as Pressure Swing Adsorption Plant.