Many fluids, semi-solids, and powders stored in 55 gallon drums will absorb water vapour when exposed to normal atmospheric humidity. This water vapour will condense, causing these substances to become contaminated and permanently damaged from the resulting chemical changes.
Drum Vent Dryers prevent this contamination, which occurs during storage and use. Changes in temperature, barometric pressure, and fluid pumping will result in air entering the drum. This air passes through a column of blue indicating silica gel, which removes and retains the water vapour. The silica gel changes from blue to pink when the desiccant is saturated and requires replacement. The drum vent dryer is reusable – saturated desiccant can easily be replaced by removing the access port plug.