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2-7 Silo Dehumidification System
Airflow range – Mid- Size 50-225 cfm
(In most cases, a 50 cfm dryer may not be adequate).
Metal silos are affected by the weather conditions surrounding them. They can become damp
internally from sweat on their sidewalls caused by changes in humidity and temperature and this
moisture can be transferred to the material stored in the silo. Silo dehumidifiers are not intended
to dry the material stored inside the silo.
Silo dehumidifiers operate on the simple principle of providing a blanket of dry air in the space
above the material to keep the material from picking up additional moisture while in storage.
Silo dehumidifiers are usually installed in the base of a silo. One dehumidifier may serve more
than one silo (if sized properly depending on the location and climate conditions).
The process heater is usually removed from the desiccant dryer (not required).
The process delivery air is driven to the top of the silo up the bulk material air delivery tube.
There is usual an air feeder tap line with a shut off valve (special tube assembly kit) sold with
the dryer to be installed in the truck fill line.
Never run the silo dehumidification system when you are filling material with the bulk truck fill
line. Isolate the dryer line with shut off valve and turn the dryer off line.
Run a return line back to the dryer to close loop the dryer and complete the loop to the dryer.
This silo dehumidified air blanketing system will blanket the silo with dehumidified air under
positive pressure. It will minimize moisture contamination of the resin.
The number of air exchanges and integrity of the blanket will depend on the size of the desiccant
system, the blower pressure and silo dome seals.
Review the silo deck for leaks prior to installation and install a PRV dome lid to prevent air from
leaking. Make sure the dome lid has pressure relief to allow for excess pressure build up.
Contact our factor application engineering for expert design and installation support.
General Information 21
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