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5.0 REFERENCE
5.1 Sizing
Determining dryer capacity at actual operating conditions
To determine the maximum inlet flow capacity of a dryer at vari-
ous 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 DHP300
handle when compressed air to be dried is at 350 psig and
90°F; ambient air temperature is 80°F?
Answer: 300 x 1.19 x 1.12 = 400 scfm.
Table 1. Rated Capacity
Rated capacity (scfm) @ 725 psig inlet pressure, 100°F inlet
temperature, and 100°F ambient temperature and 60 Hertz
operation.
RATED FLOW
MODEL
(scfm)
m
DHP130
130
DHP200
200
DHP300
300
DHP500
500
DHP750
750
DHP1000
1000
Table 2. Capacity Adjustment Factors for Air Inlet
Temperature and Pressure
INLET PRESSURES
80°F
(psig)
(barg)
27°C
300 to 725
21 to 50
1.49
Table 3. Capacity Adjustment Factors for Ambient Air
Temperature
AMBIENT
CAPACITY
TEMPERATURE
ADJUSTMENT
°F (°C)
FACTOR
80°F (27°C)
1.12
90°F (32°C)
1.06
100°F (38°C)
1.00
110°F (43°C)
0.94
Water-cooled
(85°F, 29.4°C
1.15
cooling water)
Table 4. Capacity Adjustment Factors for Electrical
Frequency
50 Hertz
60 Hertz
0.83
1.00
8
/hr
3
221
340
510
850
1275
1700
INLET TEMPERATURES
90°F
100°F
110°F
32°C
38°C
43°C
1.19
1.00
0.83
120°F
49°C
0.72
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