6
DESICCANT REPLACEMENT PROCEDURES
Pneumatech uses Activated Alumina Grade A desiccant
for all standard heatless air dryers. Dryers up to 1500
SCFM are factory filled with desiccant. Dryers 1800
SCFM and larger are supplied with loose desiccant in 50
lb. bags. The dryer must be filled with desiccant before
start-up. Dryers ranging from 5 SCFM to 500 SCFM use
1/8" diameter desiccant. Dryers 650 SCFM and larger
use a mix of 1/8” and 1/4" size desiccant. See the dryer
specification sheet or dryer data tag for amounts per
tower.
FILLING PROCEDURE
For PHM models refer to Page 15.
1. Make sure the dryer is depressurized.
2. Remove the plugs or flanges from the fill ports
located on the top of the pressure vessels.
3. Using a flashlight, inspect the inside of each vessel
to be sure they are empty.
4. Verify that the desiccant drain port located in the
bottom of the pressure vessel is closed tightly.
5. Desiccant is available in 50# bags, or 300# barrels.
Divide the desiccant into equal amounts for each
tower, and verify the correct amount by the
specification tag located on the electrical panel.
Towers can be filled manually with desiccant bags.
A fork lift or overhead crane should be used when
filling with 300# barrels.
6. Dryers 650 SCFM and larger use two sizes of
desiccant. For all heat reactivated models, fill the
tower with the 1/4" diameter Activated Alumina first,
followed by 1/8" Activated Alumina. The large
desiccant (1/4” size) is used to disperse the inlet air
flow.
7. Close the fill ports and put the dryer in service. Refer
to the Start-Up Procedure listed in this manual.
MOLECULAR SIEVE OPTION
(LOW DEWPOINT)
Dryers with optional Molecular Sieve are filled with the
Activated Alumina first and the Molecular Sieve last.
The Molecular Sieve is used as a polishing agent to
lower the dewpoint temperature.
NOTE: The proper amount of desiccant may or may not
fill the vessel to the top.
DRAINING PROCEDURE
The desiccant can be removed by the two methods
listed below. MAKE SURE THE DRYER IS
DEPRESSURIZED PRIOR TO REMOVING THE FILL
OR DRAIN PORT.
Method #1 – Remove the drain port and drain the
desiccant into buckets which are then poured into the
proper dumpster or receptacle.
Method #2 – Usually used for large dryers (1000 SCFM
and larger). An industrial dry vacuum cleaner is required
for this method.
1. Remove the desiccant fill port.
2. Using an industrial vacuum cleaner, remove the
desiccant from the vessel.
3. Open the desiccant drain port and remove the
remaining desiccant.
DESICCANT DISPOSAL
Desiccant is not considered a hazardous waste, unless
contaminated with oil or other toxic substances. Disposal
of the desiccant should be handled by a local waste
management company.
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