AEC HE Mass Flow Series Drying hoppers - Manual (Page 51)

Page 50 HE
• CHE • BCHE Mass Flow Series Drying Hoppers
Cleaning with Compressed Air
Blow clean, dry compressed air up and down the pleats, blowing out the filter from
the clean side. Remove loose dirt from the filter with compressed air or a water
hose. Compressed air should be less than 100 psi (689.5 kPa/6.89 bars). Use a
1 /
8
”-x.
(3 mm-dia.) nozzle at least 2” (5 cm) away from the filter. Don’t shoot the air in a
crisscross motion against the grain of the pleats—you may damage it.
Washing
As a last resort, wash the filter. However, do so only if the pressure drop is too
high from fine dirt embedded in the filter, or if oily mist is present near the intake
air location. Soak in a solution of FM 1400 or comparable detergent and warm
water from five to ten minutes, then gently agitate for several minutes.
Rinse thoroughly with clean water to remove all detergent. Let the filter dry
completely before returning it to service. Do not use a light bulb to dry the filter.
You should get satisfactory filtration after second or third washings; however, dirt-
holding capacity of the filter decreases after each washing.
After each cleaning:
• Inspect the filter element. Briefly hold a light bulb behind the element and look
for any fatigued paper or residual dirt. Inspect for holes and tears by looking
though the filter toward a bright light. Check for damaged gaskets or dented
metal parts. Do not re-use a damaged filter!
• Inspect the end plates. Any damage here can allow air to bypass the filter.
• Look for rust on the end plates and metal core. Rust particles can flake off and contaminate
the dryer and resin.
• Check the gasket for damage. A damaged gasket allows contaminants into the process.
Replace as needed.
• Allow the filter to dry before re-using. Circulate warm air at less than 160ºF (71ºC). Do not
use a light bulb to dry the filter.