5
All desiccant shipped loose must be added to the
dryer chambers before the dryer is put into service
Refer to TABLE 1, DESICCANT REQUIREMENTS for
desiccant type and quantity per tower.
TO ADD DESICCANT
WARNING — The following procedure provides in-
structions for adding the initial desiccant to the tow-
ers. If replacing desiccant, refer to the “Procedure
for Desiccant Charge Replacement” in Section 7.0.
1. Verify pressure gauges of both towers indicate
0 psig. If not, depressurize the towers according to
the shutdown instructions in Section 6.
2. Remove the pipe plug or fill port flange cover (where
applicable) from the desiccant fill port at the top of
each tower. Refer to Figure 3 for the fill port loca-
tion.
CAUTION – Pouring desiccant creates a fine dust;
safety goggles, gloves and a dust mask should be
worn by personnel installing desiccant. Refer to the
Material Safety Data Sheet that accompanies desic-
cant shipped loose for more complete information.
CAUTION – Do not tamp the desiccant in the towers.
Tamping damages desiccant and causes dusting.
3. Refer to Table 1 for desiccant quantity per tower.
When using Table 1 you will find the desiccant quan-
tities listed in layers. Each layer will vary in depth
due to the type, quantity and purpose of the desic-
cant. Layer 1 must be installed first at the bottom of
the vessel followed by layer number 2 etc., until the
complete charge of desiccant has been installed.
4. Utilizing an appropriate sized funnel, fill each desic-
cant tower as follows:
a. Install the required quantity of tabular support or
activated alumina in layer 1 of each tower.
b. Level layer 1 and each subsequent layer of desic-
cant as added to each chamber.
c. Finish filling each tower with desiccant until all
desiccant has been installed. LIGHT tapping
on the tower sides with a soft-face mallet should
yield additional free space to allow installation of
all desiccant required. DO NOT TAMP OR RAM
DESICCANT.
5. Clean the fill port closure. Replace the fill plug using
Teflon tape or another pipe thread sealant suitable
for compressed air service. Reinstall fill port flange
cover (where applicable) in each desiccant tower.
TABLE 1
DESICCANT REQUIREMENTS
(Quantity per Tower)
Layer
Model
1 2 3
500
354#
1/8” bead AA
— —
600
453#
1/8” bead AA*
— —
750
590#
1/8” bead AA
— —
900
590#
1/8” bead AA*
— —
1050
710#
1/8” bead AA
— —
1300
48#
1/4” bead AA*
876#
1/8” bead AA*
—
1500
92#
1/4” bead AA*
1167#
1/8” bead AA*
—
1800
92#
1/4” bead AA*
1167#
1/8” bead AA*
—
2200
161#
1/4” bead AA
1706#
1/8” bead AA*
—
2600
161#
1/4” bead AA*
1706#
1/8” bead AA*
—
3200
258#
1/4” bead AA*
2119#
1/8” bead AA*
—
3600
258#
1/4” bead AA*
2353#
1/8” bead AA*
—
4300
719#
1/2” bead TS**
146#
1/4” bead AA*
2679#
1/8” bead AA*
* AA = Activated Alumina
** TS = Tabular Support