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Symptom Cause
Solution
Insufficient preheating (continued)
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Moisture in
Collector
Keep fan running for 5 to 10 minutes after process is shut
down
Insulate the collector if it is to be located outside
Install a bypass line to allow pre-heating of the collection
system
Install a heating system inside the collector
Move collector indoors
Install moisture resistant or washable cartridges
System is not purged after shutdown
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If the collector is located outside, it must be insulated
Preheat collector before operation
Purge collector after process shutdown
Move collector indoors
Install a bypass line to allow heating of the system while off-
line
Install a heating system inside the collector
Install moisture resistant or washable cartridges
Wall temperature below dew-point
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Locate cold spots and repair insulation
Eliminate direct metal line through insulation
Move collector indoors
Install moisture resistant or washable cartridges
Cold spots through insulation
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Open drain valve on air header to see if water comes out
Check to see if compressed air supply has an air dryer
installed
Verify air dryer is rated for –85 degree dew point
Replace desiccant in the dryer
Replace dryer
Install moisture resistant or washable cartridges
Water / moisture in compressed air
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Check ductwork on inlet and outlet to assure good caulking
Check ductwork on inlet and outlet to assure tightened
bolts
Check frame and panels caulking (re-caulk if necessary)
Check frame and panels for tightened bolts (replace or
tighten)
Check ductwork for any leaks or punctures (repair or
replace)
Check door gasket for leaks (repair or replace)
Install moisture resistant or washable cartridges
Leaks in the collector and ducting
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Check designed capture velocity of hood vs. actual (adjust)
Check designed location of collection point vs. actual (re-
locate)
Reduce airflow at collection point
Minimize water overflow in process equipment if possible
Move the collection point of process if possible
Install moisture resistant or washable cartridges
Moisture in Collector (continued)
Scalping of process moisture (processes
using water – i.e. Banbury Mixer)
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Summary of Contents for Gold Series
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