9
SIZING
Determining dryer capacity at actual operating conditions
To determine the maximum inlet flow capacity of a dryer
at various operating conditions, multiply the rated capacity
from Table 1 by the multipliers shown in Table 2.
Example: How many scfm can an air-cooled model 400
handle when compressed air to be dried is at 200 psig and
100°F; ambient air temperature is 80°F?
Answer: 400 x 1.22 x 1.12
= 547 scfm.
TABLE 1
Rated capacity (scfm) and pressure drop @ 100 psig inlet
pressure, 100°F inlet temperature, and 100°F ambient
temperature
MODEL
100
125
150
200
250
Rated capacity
of air-cooled
models (scfm)
60 Hz
50 Hz
100
84
125
105
150
125
200
170
250
210
MODEL
300
400
500
600
750
Rated capacity
of air-cooled
models (scfm)
60 Hz
50 Hz
300
250
400
340
500
420
600
540
750
630
TABLE 2
Air capacity correction factors (Multipliers)
INLET COMPRESSED AIR CONDITIONS
INLET
PRESSURES
INLET TEMPERATURES
80°F
90°F
100°F
110°F
120°F
psig
kgf/cm
2
27°C
32°C
38°C
43°C
49°C
50
80
100
125
150
175
200
3.5
5.6
7.0
8.8
10.5
12.3
14.0
1.35
1.50
1.55
1.63
1.70
1.75
1.80
1.05
1.17
1.23
1.31
1.37
1.42
1.47
0.84
0.95
1.00
1.07
1.13
1.18
1.22
0.69
0.79
0.82
0.91
0.95
0.99
1.03
0.56
0.66
0.70
0.74
0.80
0.84
0.89
COOLING MEDIUM*
AMBIENT
TEMPERATURE
MULTIPLIER
°F
°C
80
90
100
110
27
32
38
43
1.12
1.06
1.00
0.94
*Air-cooled models; water-cooled models use 1.15 multiplier if cooling
water is below 35°C, 95°F.
3.0 MAINTENANCE
3.1 Condenser coil – Clean off accumulated dust
and dirt monthly.
3.2 Moisture separator – Replace filter element
when pressure drop across dryer is excessive
or annually.
3.3 Check separator daily to be sure automatic
drain is discharging.
3.4 Blow down separator weekly by pushing test
button on control panel.
3.5 Rebuild drain mechanism annually.
To facilitate service, maintenance kits are available.
Models 100-150
Drain Line
PTC Swivel Elbow
Element
Wave Spring
Float Drain
Element O-Ring
Bowl O-Ring
Head
Models 200-750
Head
Element O-Ring
Bowl O-Ring
Element
Bowl
Drain Quick Disconnect
Bowl Support
*Models 500-750 Only.
