In some applications, compressed air lines may be exposed to temperature below freezing levels. In these applications, the pressure dew point must be reduced to below the levels that a refrigerant air dryer can achieve, in order to prevent ice from forming in the compressed air lines. There are many applications where compressed air may come into contact with chemicals, food products or other products in which water vapor in the compressed air may interact negatively in the process. These applications are referred to as “process” applications, and it is often necessary to remove almost all of the water vapor from the compressed air. There are also applications where compressed air is used for instrumentation purposes, and water vapor will negatively affect the instruments.
These are all applications where desiccant air dryers are required. There are international standards for purity of compressed air for particulate and oil content, and dew… Read the rest