15
6 Preventative Maintenance
6.1 Service Intervals
Key:
Description of Service Required Service recommended every:
Component Operation
Day
Monthly
3-months
6-months
12-months
36-months
Dryer Check POWER ON indicator is illuminated.
Dryer Check STATUS / FAULT indicators located on the controller.
Dryer Check for air leaks.
Dryer Check the pressure gauges during purging for excessive back pressure.
Dryer Check the condition of electrical supply cables and conduits.
Dryer Check for cyclic operation.
Dryer
Replace the active exhaust silencers
Recommended Service
Filtration
Replace the coalescing filters and service the auto-drains
Recommended Service
Filtration
Replace the adsorption filters - Activated Carbon
(1)
Recommended Service
(1) Unlike oil aerosol removal filters which are changed annually to guarantee compressed air quality, the lifetime of an oil vapour removal filter can be attributed to various factors and
require more frequent changes. Factors affecting the lifetime of adsorption filters are:
Oil vapour concentration - The higher the inlet concentration of oil vapour, the faster the activated carbon capacity will expire.
Bulk oil - Adsorption filters are designed to remove oil vapour and odours, not liquid oil or aerosols. Poorly maintained or non-existent pre-filtration will cause the OVR filter capacity to
quickly expire.
Temperature - Oil vapour content increases proportionally to inlet temperature, reducing element life. Additionally, as temperature increases, the adsorption capacity decreases, again
reducing element life.
Relative Humidity or Dewpoint - Wet air reduces the adsorptive capacity of the carbon.
Compressor oil changes - When compressor oil is changed, the new lubricant burns off “light ends” which increases the oil vapour content for hours or even weeks
afterwards. This increase in oil vapour content is adsorbed by the OVR filter, significantly reducing its adsorptive life.
ACS / AC element performance is based upon a maximum oil vapour inlet concentration of 0.018mg/m
3
, with compressed air at 21
o
C and a pressure dewpoint of -40
o
C PDP.
These elements should be replaced upon detection of vapour, odour or taste.
See Note (1)
Filtration
Replace the adsorption filters - Hopcolite
(2)
Recommended Service
(2) Under normal operating conditions the HC cartridge should be replaced every 12 months. If an oil vapour incident occurs then we recommend that the AC and HC stages are
replaced at the same time .
See Note (2)
Dryer
Replace / Calibrate dewpoint transmitter
Recommended Service
Dryer
Complete valve overhaul
Recommended Service
Dryer
Replace the desiccant
Recommended Service
Check
Process Replace
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