Van Air Systems PLD 8-2.8 / 36-2.8 - Manual (Page 6)

PAGE 6
FIGURE 4-A BED LEVEL DETAIL
The level of the desiccant bed should be maintained as close to
the MAXIMUM level as possible. The bed level should not be
allowed to fall below the MINIMUM level. Dehydrator performance
will be effected. Reference Figure 4-A for levels and quantities.
With the fill port cover removed, use a measuring stick to deter-
mine the distance from the top of the fill opening to the top of the
desiccant bed. Reference Figure 4-A. Add desiccant as required
to bring desiccant bed to maximum level.
CAUTION
Never fill the vessel above the MAXIMUM LEVEL.
Filling the vessel above the MAXIMUM level may
effect the performance of the dehydrator.
The desiccant bed level should be checked regularly. Section
4.4 DESICCANT CONSUMPTION will help you estimate the
amount of desiccant that the dehydrator should use based on
operating conditions.
4.5 DESICCANT CONSUMPTION
Consumption rate based on average conditions. Actual condi-
tions can vary.
4.5-A GASDRY PRIME DESICCANT
This general purpose tablet is recommended for installations
where inlet gas temperature is 100 o F or lower. Depending on the
pressure and temperature, GasDry Prime can provide a residual
moisture content below 19 lbs/mmscf.
4.4 BED LEVEL GUIDE
Chart 1 shows the level of dryness that GasDry Prime will provide
at different conditions.
Chart 2 shows an approximate consumption rate for GasDry Prime
at several conditions. Use the charts for guidelines to calculate
the approximate consumption rate of the desiccant.
CHART 1
MODEL
PLD 8-2.8
PLD 12-2.8
PLD 16-2.8
PLD 20-2.8
PLD 24-2.8
PLD 30-2.8
PLD 36-2.8
C
Dim. To
MIN LEVEL
15-1/2"
14-1/2"
15-1/8"
17-3/8"
18-3/8"
19-7/8"
21-5/8"
MODEL
PLD 8-2.8
PLD 12-2.8
PLD 16-2.8
PLD 20-2.8
PLD 24-2.8
PLD 30-2.8
PLD 36-2.8
PRE-BED
CERAMIC
BEAD
17 LBS
38 LBS
59 LBS
91 LBS
133 LBS
212 LBS
318 LBS
DRYING
GASDRY
PEAK
19 LBS
88 LBS
143 LBS
222 LBS
324 LBS
518 LBS
778 LBS
DRYING
GASDRY
MAX
21 LBS
96 LBS
156 LBS
243 LBS
354 LBS
565 LBS
848 LBS
B
Dim. To
Pre-Bed
23-1/2"
30-1/2"
31-1/8"
33-3/8"
34-3/8"
35-7/8"
37-5/8"
DRYER DIMENSIONS- INCHES
D
Dim. To
MAX LEVEL
12-1/4"
7-1/2"
7-3/8"
9-3/8"
10-3/8"
11-7/8"
13-5/8"
A
Dim. To
Grid
29-1/2"
36-1/2"
37-1/8"
39-3/8"
40-3/8"
41-7/8"
43-5/8"
MOISTURE CONTENT OF GAS (LBS. H2O/MMSCF)
AFTER DEHYDRATOR WITH GASDRY PRIME
INLET
TEMP
100
o F
95 o F
90 o F
85 o F
80 o F
75 o F
70 o F
65 o F
60 o F
55 o F
50 o F
50
PSIG
391.8
336.5
288.9
246.5
210.2
178.1
150.3
126.9
106.9
89.0
74.4
100
PSIG
224.7
193.1
165.9
141.6
120.8
102.5
86.6
73.2
61.7
51.4
43.0
175
PSIG
139.2
119.7
103.0
87.9
75.1
63.8
53.9
45.7
38.6
32.2
27.0
200
PSIG
124.0
106.6
91.7
78.4
67.0
56.9
48.2
40.8
34.4
28.8
24.1
250
PSIG
102.1
87.9
75.7
64.7
55.3
47.0
39.8
33.8
28.5
23.9
20.0
150
PSIG
159
136.7
117.6
100.4
85.7
72.8
61.5
52.0
43.9
36.7
30.7
280
PSIG
92.6
79.8
68.7
58.7
50.2
42.7
36.2
30.7
26.0
21.7
18.2
NOTE
MMSCF is 1,000,000 STANDARD CUBIC FEET
DRYING
GASDRY
PRIME
25 LBS
115 LBS
187 LBS
291 LBS
425 LBS
678 LBS
1018 LBS