Relative Humidity is the ratio of moisture in the air compared to the capacity of moisture that volume of air is capable of holding at a specified temperature. When air is compressed, friction causes the actual air temperature to rise, greatly increasing its ability to hold moisture. At 100 PSIG the quantity of moisture commonly held in eight cubic feet of air is reduced in an area 1/8 its original size. The result of compression is hot, wet, dirty air. A good general rule is that for every twenty degrees Fahrenheit (20°F), the temperature of air decreases, its ability to hold moisture is reduced by 50%. As air passes through a plant piping system, the ambient conditions cause the compressed air to cool, causing the formation of liquid water. This water, coupled with particulate matter and oil/lubricant carry-over will cause numerous problems. The water will wash away lubricants from tools and machinery, spoil paint applications, rust the general system, and, if exposed to unfavourable ambient temperatures, freeze. Particulate matter will clog orifices and valves, damage gear driven equipment, increase system pressure drop and contaminate product. Residual oils and lubricants will cause valve wear, spoiled product and system contamination. It is essential to treat process air before it can do any damage. By drying and filtering compressed air, operation efficiency can be maximized, and equipment productivity and longevity greatly increased. A properly designed air system will pay for itself.  

courtesy of Airtek Inc.

Skeans Coquitlam, Edmonton & Winnipeg sales division inventory Refrigerated Air Dryers in 10 - 100 SCFM;

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Desiccant Dryers

AIRTEK Twin Tower Desiccant dryers are available in heatless and pressure swing, externally heat reactivated and blower purge desiccant configurations. Airtek Desiccant dryer features include: fully packaged systems, PowerLoc and CycleLoc energy saving systems, ThermaLoc heater protection systems, sequence enunciators, dual mode heatless backup, programmable logic controllers and digital dew point readout.

TW Series

From Xebec website: As the effects of moisture in natural gas systems are not always immediately evident, some NGV station builders are reluctant to address the importance of installing desiccant dryer systems in CNG fuelling stations. This is despite the fact that there are industry standards and recommended practices for the required dew point of compressed natural gas used for fuelling stations, such as ISO 15403:2000(E). The most common reason for not installing dryers in NGV stations is the belief that the gas is already dry. However, it should be taken into consideration that although the gas dew point may be as low as -40°C in the pipeline at pipe pressure, the effects of compression will affect the dew point of the gas. Natural Gas Drying is not Skeans core competency however, we can assist you with your requirements and act as your Natural Gas Dryer factory liaison

Regenerable Single Tower

Manual & Point of use Dryers
Wilkerson's manual desiccant dryers offer the most cost effective method to remove moisture from very low flow compressed air systems or those systems which are only used infrequently.  Atmospheric dew points as low as -100 F (-73 C) are obtainable with units available for continuous flows up to 25 SCFM.  These dryers are an excellent choice for point-of-use applications.