Compressed air is widely used in manufacturing for many types of applications. Pneumatic tools, food and beverage processing equipment, laser and welding systems, and more rely on a continuous supply of clean, dry compressed air.

Air compression systems and the equipment they power are vulnerable to moisture and condensation created when humidity falls out of the ambient air during the compression process. Several types of compressed air dryer systems can be used to remove that moisture and protect the many different devices utilizing compressed air.

Here, we will look at what a compressed air dryer is, why drying air is so important, and the primary reasons for moisture buildup in compressor systems.

What Is a Compressed Air Dryer?

Compressed air dryers, or simply air dryers, remove moisture from compressed air. In humid environments, compressed air dryers are essential to ensure continuous operations, product quality, and reduced downtime.

There are several ways to select an air dryer system to meet your needs. It is critical that the dryer you select has maximum capacity (CFM) and pressure (PSI) outputs matched to that of your air compressor and system demand. The specific application and atmospheric humidity and temperature patterns in the facility will determine the ideal selection.

Two common types of air dryers are 1) refrigerated dryers, which cool the air, condenses vapor into water, and drain it away, and 2) desiccant dryers, which use absorbent material to remove moisture. Dryers can be integrated into the compressor/mechanical room or placed elsewhere in the facility, at the point(s) of use. Locating a dryer at the point of use, such as close to pneumatic equipment, allows the compressed air to cool as it moves away from the compressor, further reducing moisture.

Why is Dry Air Important?

The air around us contains varying levels of moisture, depending on temperature and humidity. The moisture level in compressed air is expressed in terms of pressure dew point (PDP), or the temperature at which vapor becomes water within pressurized air.

Excess moisture in compressed air causes many problems, including:

• Poor performance of pneumatic equipment, instrumentation, and parts (e.g., bearings, seals, motors)
• Corrosion in machinery and in the compressor system itself
• Damage or degradation to products
• Product contamination due to bacteria in built-up moisture
• Contamination of pure air used in food, beverage, or pharmaceutical applications
• Damage to air lines and equipment if excess moisture freezes and expands
• Lower facility air quality

Why Does Moisture Accumulate in Compressors?

Several factors lead to the accumulation of excess moisture in an air compressor:

• Equipment Failure: As internal components wear, the compressor may retain moisture. Regular maintenance keeps build-up at bay and enables the system to retain power and efficiency. A worn compressor can heat up quickly, creating more moisture.
• Environmental Factors: High-humidity settings naturally increase condensation levels inside an air compressor unit. Air conditioning units can help dry out the air in the facility, so the compressor takes in less moisture to begin with. Locating a compressor in a closed, air-conditioned, or cooler part of the facility also helps reduce moisture.
• Undersized Compressor Unit: A compressor that is working beyond its rated capacity will heat up quickly and generate more condensation. Always select the right size compressor for your compressed air needs.

Air Compressor & Dryer Services From John Bouchard & Sons Co.

Compressed air dryers are critical for the performance and longevity of your compressed air system. John Bouchard & Sons Co. offers comprehensive services for selecting and maintaining air compressor and dryer equipment including system design, airend rebuilds, turnkey installations, air audit services, preventative and routine maintenance programs, rental equipment, as well as 24/7 emergency repair service.

Contact us to speak with a specialist about your air compressor and air dryer needs.

Click Here to view product details on Compressed Air Dryers we carry.