Great Lakes Air Products GPS-500 Manuale di istruzioni - Pagina 9
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Pre & After Filtration
The Pre & After-filter element should be replaced whenever the pressure drop becomes excessive.
Differential pressure is the best method to gauge the need for element replacement. The
recommended maximum element differential is 10 PSIG. The pressure at which you should change
your elements should be determined by comparing the operational efficiency of your system (cost of
pressure drop vs. cost or the elements). Many facilities put filter replacement on an annual or bi-annual
schedule based on system contaminant load.
Control Air Filter
Frequent inspection of the control air filter is required so desiccant particulate does not restrict the
control air required for pneumatic actuation of dryer valves. The control air filter is generally replaced
when the particulate after-filter on the dryer is replaced.
Purge Muffler Maintenance
Purge mufflers prevent high noise levels from the cyclic depressurization of the desiccant towers. The
desiccant fines generated from normal operation will cause the muffler elements to become clogged,
which will restrict purge flow and cause insufficient regeneration.
backpressure during operation replace the muffler element.
The desiccant loading procedure can cause a large amount of desiccant dust to accumulate prior to
equipment startup. Most of this accumulation is blown out the purge exhaust valve during the first
hours of operation. The high volume of desiccant fines from startup limits the life of the initial purge
muffler element. It is recommended that the muffler element be replaced after the first 100 hours of
operation. Subsequent element replacements should be every 6 months to a year or as dictated by
regeneration tower backpressure.
Purge Rate Maintenance
An adequate supply of purge air is essential for proper regeneration of desiccant and good dewpoint
suppression. If your system pressure varies throughout the day set the purge pressure at a low period
so in low-pressure periods the purge flow is not starved. Always consult the factory prior to changing
operating conditions. The adjustable purge valve should be set to the following values for standard
equipment operating at standard conditions.
Purge Set
Model
Pressure
GPS-25
GPS-35
GPS-50
GPS-75
GPS-100
GPS-125
GPS-175
Desiccant Maintenance & Replacement
Desiccant life is estimated at 3 to 5 years, however conditions differ with location. Contamination of
desiccant is a leading cause of accelerated failure. Close preventative maintenance of the coalescing
pre-filters will extend the life of the desiccant. Spent desiccant should be drained through the desiccant
drain port in the bottom of each tank. Desiccant alone is not hazardous and can be disposed of as a
general landfill product. Oil contaminated desiccant must be dealt with on the basis of the amount of oil
contamination.
Fresh desiccant should be added through the desiccant fill port, which is where the pressure safety
relief valves are located. Always leave adequate room above the desiccant bed to permit some bed
motion and expansion during dryer operation.
Be certain to only install the approved activated alumina that your Great Lakes Air Products
representative can provide; it excels with respect to dew point suppression capability and attrition
resistance. Various brands can cause excessive attrition, and poor dew point suppression.
Model
40
GPS-250
40
GPS-350
40
GPS-500
45
GPS-650
50
GPS-800
50
GPS-1000
45
GPS-1250
GPS Heatless Regenerative
Page 9 of 14
If the purge tower shows
Purge Set
Model
Pressure
50
GPS-1400
50
GPS-1600
50
GPS-1800
50
GPS-2000
45
GPS-2250
50
45
Purge Set
Pressure
45
40
50
45
45