Reference; Sizing - Gardner Denver RHP Series Instruction Manual

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 RHP300
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
RHP130 130
RHP200 200
RHP300 300
RHP500 500
RHP750 750
RHP1000 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