A PSA (Pressure Swing Adsorption) oxygen gas plant generates high-purity oxygen by separating it from atmospheric air using molecular sieve technology. In this process, ambient air is compressed, filtered, and dried before entering the PSA unit, where nitrogen is preferentially adsorbed by zeolite molecular sieves, allowing oxygen to pass through as the product gas. The system operates with twin adsorption vessels that alternate between pressurization and regeneration cycles to ensure continuous oxygen production. The produced oxygen typically has a purity of 90% to 95% and is collected in an oxygen receiver for storage and distribution. PSA oxygen plants are widely used in hospitals, steel plants, wastewater treatment, and industrial processes due to their reliability, efficiency, and on-site generation capability.