Pressure containers that store a large amount of compressed air mass in a small volume to use it for operations in paint shops, shot-blasting systems, etc. to quickly meet the short time air demand at the point of use, or to reduce pulsating compressed air at source.
Small capacity air cylinders are used for breathing purposes for divers, in hospitals, fire-fighters. In such cases, the cylinders are filled with air from special oil-free high-pressure compressors called “breathing” or so-called synthetic air, which is a mixture of oxygen and nitrogen.
(See also, ‘Air Receiver Tank’)