Van Air SP Special Purpose Desiccant

Van Air Systems’ Special Purpose, Type SP, is an absorbent deliquescent desiccant formulated for single and sequential tower compressed air dryers. SP is a hard tablet formed from hygroscopic materials that attract and hold moisture. The materials in the compound are non-toxic and are completely soluble in water. To be used where the operating temperature is at or below 80°F, it produces lower dew points for both natural gas and compressed air applications.

As the desiccant tablet draws water vapor out of the compressed air, the surface of the tablet slowly dissolves and forms a solution which eventually drops from its surface. The deliquescent desiccant tablet continues to remove moisture and forms this solution until the tablet is entirely consumed. For applications where the temperature conditions are above 80°F, crystals may form in the drain solution, causing a caking problem. (A prebed of ceramic bead support # 33-0281 is recommended to minimize crystal formations in natural gas applications.)

Recommended for use where the operating temperature is at or below 80° F, SP is specially formulated to be used as a first stage absorbent desiccant in the compressed air dehydration process. When used in a properly sized single or sequential tower desiccant air dryer, SP will remove sufficient moisture vapor to establish an approximate 33% RH in the air line.


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