Van Air Systems D8 - Manual (Page 6)

PAGE 6
A
MAX.
Level
5-1/4"
(13.33)
6-15/16"
(17.62)
B
MIN.
Level
7-11/16"
(19.53)
12-1/2"
(31.75)
C
Total
Depth
17-11/16"
(44.93)
21-11/16"
(55.09)
BED DIMENSIONS
INCHES (centimeters)
MODEL
D4
D8
SECTION 4 MAINTENANCE
Lbs./In
of bed**
0.55
0.25
2.32
1.05
MIN.
Level
5.53
2.51
21.61
9.80
MAX
Level
6.86
3.11
34.44
15.62
MIN to
MAX
Level
1.33
0.60
12.83
5.82
Lbs./In
of bed**
0.405
0.18
1.70
0.77
MIN.
Level
4.05
1.84
15.84
7.19
MAX
Level
5.02
2.28
25.24
11.45
MIN to
MAX
Level
0.97
0.44
9.40
4.26
Lbs./In
of bed**
0.48
0.22
2.01
0.91
MAX
Level
5.96
2.70
29.84
13.54
MIN to
MAX
Level
1.16
0.53
11.12
5.04
MIN.
Level
4.8
2.18
18.72
8.49
DRY-O-LITE QUANTITY*
POUNDS (kilograms)
MODEL
D4
D8
SP QUANTITY*
POUNDS (kilograms)
10 BF QUANTITY*
POUNDS (kilograms)
* Amounts are pounds (kilograms) required to fill dryer to levels indicated. ** Amounts in italics are kilograms per centimeter of bed depth.
CAUTION
Make sure that the desiccant does not cover the screen on the
outlet pipe.
Do NOT overfill the vessel.
Start up the dryer following the procedures in Section 3.1.
4.4-A BED LEVEL GUIDE
To determine the supply of desiccant in the dryer, insert a
measuring stick through the fill port until it reaches the top of the
desiccant bed; dimensions in FIGURE 5 are calculated from the fill
port to levels indicated on the drawing. (NOTE: Dimensions are
approximate and are intended as a general guide only.)
4.4-B DESICCANT USAGE GUIDE
The chemical and physical characteristics of Van Air desiccant
contribute to its effectiveness and economy.
The DESICCANT CONSUMPTION RATE should be used as a guide
to estimate the usage of desiccant your installation will require. The
formula is based on an annual usage rate of one shift per day, 5 days
per week and 50 weeks per year or 2,000 operating hours per year.
The figure is an average and may vary depending upon your actual
conditions (i.e. 24 hour operation, higher inlet temperature, excessive
liquid water content and/or contaminants.)
DESICCANT CONSUMPTION
(Based upon 1 shift for a one year period @ 100 psig inlet pressure and
75 o F inlet temperature, 100% RH.)
To use the chart, first determine the SCFM that is being processed
through the dryer. Locate the nearest flow rate listed on the chart
and interpolate as necessary.
The consumption rate is proportional to the moisture loading. Each
20 o F change in inlet temperature changes the moisture loading by a
factor of nearly 2:1.
The quantity shown in the consumption rate chart is NOT the
quantity that must be added to the dryer at one time. The bed level
should be maintained at least to the minimum level at all times to
ensure optimum drying capabilities. The consumption rate is an
approximation of how much desiccant will be added over a period of
one year.
The desiccant bed should be filled approximately 2 to 3 times a year.
FLOW
SCFM
10
20
40
50
75
100
DRY-O-LITE
LBS/YEAR
13.2
26.4
52.8
66.0
99.0
132.0
SP
LBS/YEAR
66.5
133
266
332.5
498.8
665.0
10 BF
LBS/YEAR
57.6
115.2
230.4
288.0
432.0
576.0
FIGURE 5 BED LEVEL DETAIL