A Psa Nitrogen/Oxygen Plant is a facility that takes nitrogen from air. Air is approximately 78% nitrogen, 21% oxygen and a few trace gases. At the facility, the oxygen and other gases are filtered out so only pure nitrogen can be extracted. Once extracted, nitrogen is often used for many different purposes, such as food preservation, treating metals, pharmaceuticals, and electronics.... https://guninaengineers.blogspot.com/2025/07/how-nitrogen-gas-plant-works-complete.html