56
When the compressor is too small the ammount of inlet volumetric flow of compressed air
that is used by purge release during regeneration will exceed 21% and may evern reach 100%
in systems with extremely undersized compressors. This condition will cause high pressure
drops.
Solution is to either use a stronger compressor, a smaller adsorption dryer or replacement of
purge nozzles.
13.2.2 The Downstream System is Oversized
Compressor, adsorption dryer segment and downsteream users should be dimensioned
accordingly. The problem of undersized compressor has been described on the previous page.
The demand of oversized downstream users can cause a high pressure drop on the dryer
although the dryer is not the cause. This occurs when the downstrewam users use more
compressed air than the volumetric flow from the outler of the adsorption dryer can supply.
You will need a stronger compressor and a bigger adsoprtion dryer.
13.2.3 Oil in the Adsorption Dryer
The reason for high pressure drop may be the oil from compressor that saturated and blocked
the filters. If the oil comes in contact with molecular sieve, it will destroy the molecular sieve.
If you see oil on the after-filter the molecular sieve is destroyed, in which case the molecular
sieve should be changed together with filter cartriges.
Check-up procedure:
1.
Check pre-filter and after-filter for signs of oil and/or other contamination!
2.
Change the filter catridges if needed!
3.
If there is oil on the after-filter, change the adsorbent on both towers!
4.
Service and/or improve pre-filtration!
Compressed air at the dryer inlet should be free of solid particles, oil particles and liquid water.
For more information on proper air preparation see the chapter
Installation Layout
!
13.2.4 Dryer Connected to the System in the Opposite Way
Although it may seem to be a unlikely or even impossible cause of high pressue drop, cases
like this do occur. Make sure that the dryer is installed in a correct way.
Summary of Contents for B-DRY 1000
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Page 37: ...37 Enter the password and you will get access to the controller interface...
Page 61: ...61 15 Maintenance Record TYPE OF MAINTENANCE DATE SIGNATURE NOTES Commissioned...
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