Air Eliminators and Combination Air Eliminator Strainers are designed to provide separation, elimination, and prevention of air in piping systems for various installations and conditions. Air Eliminators enhance the circulation of pressurized liquids by excluding air and other non-condensable gases, which may collect at high points in the system. An air eliminator is a piping segment that links to the main pipe to trap and release air, fitted ahead of flow meters in a pipeline not to measure air. It can therefore take a more detailed volumetric reading.
Three types of air eliminators used in steam or hot water heating and cooling systems are:
• Float-type air vents
• Thermostatic air vents
• Combination float and thermostatic air vents
Manual and mechanical air eliminators are relatively inexpensive and straightforward to repair. However, the requires more workforce and may not be cost-efficient in the long run due to more periodic repairs. An automatic air eliminator can provide more decisive volumetric measurements but is further expensive than mechanical ones.
Air eliminators should be tested upon installation and maintained regularly. Technicians recommend checking the air vents of these devices at least twice a year. The devices' life and condition may be prolonged by installing a separator with mesh to trap solids that can lodge into the air eliminator. Replacement of an air eliminator is suggested after five years.