Compressed air system has been used in many industries like: Oil and Gas, Power Plant, Refinery Plant, Cement Plant, Food and Beverages, Pulp and Paper, Hospital, and others; for various applications, such as: Instrument Air, Service Air, Pneumatic Conveying, Medical Air and many other applications. Each application has its own quality standard requirement stipulated by ISO 8573:1 Compressed Air – Contaminants and Purity Classes. There are 3 component classes that specified in this standard: Solid Particle Classes, Humidity and Liquid Water Classes, and Oil Classes.

Compressed air system may consist combination of these following equipment:

• Air Compressor (Oil Injected or Oil Free)
• Water Separator (or Oil/Water Separator)
• Pre-Filter
• Dryer (Desiccant or Refrigerant)
• Active Carbon Filter (if needed)
• After Filter