Sizing - Gardner Denver 9VXRD Series Instruction Manual

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 a model 1000 handle when the compressed air to be dried is at 80 psig and 90°F; ambient air
temperature is 80°F; and a 38°F dew point temperature is desired?
ANSWER: 1000 x 1.17 x 1.12 x 1.0 = 1310 scfm.
Pressure Drop
To determine pressure drop at increased flows, multiply the pressure drop at rated conditions from Table 1 by the multiplier
shown in Table 3 for the appropriate air flow rate and operating pressure.
EXAMPLE: What is the pressure drop across a model 1000 when flowing 1500 scfm at 200 psig ?
ANSWER: 1500/1000 = 1.5; multiplier below at 1.5 and 200 psi = 1.1; 1.1 x 4.2 psi = 4.6 psi.
TABLE 1
Rated capacity and Pressure @ 100 psig inlet pressure,
100°F inlet temperature, and 100°F ambient temperature
MODEL
Rated Capacity of 60 Hz
Air-Cooled Models (scfm) 50 Hz
Pressure Drop (psi) 60 Hz
50 Hz
scfm x 0.0286 = m 3 /min
TABLE 2
Air capacity correction factors (multipliers)
INLET COMPRESSED AIR CONDITIONS
INLET
PRESSURES 80°F
psig kg/cm 2 27°C
50 3.5 1.35
80 5.6 1.50
100 7.0 1.55
125 8.8 1.63
150 10.5 1.70
175 12.3 1.75
200 14.0 1.80
COOLING MEDIUM*
AMBIENT
TEMPERATURE MULTIPLIER
°F °C
80 27 1.12
90 32 1.06
100 38 1.00
110 43 0.94
* Air-cooled models; water-cooled models use 1.15 multiplier if cooling
water is below 95°F, 35°C
800 1000
scfm scfm
800 1000
745 830
3.6 4.2
3.2 3.0
INLET TEMPERATURES
90°F 100°F 110°F
32°C 38°C 43°C
1.05 0.84 0.69
1.17 0.95 0.79
1.23 1.00 0.82
1.31 1.07 0.91
1.37 1.13 0.95
1.42 1.18 0.99
1.47 1.22 1.03
OUTLET DEWPOINT
DEW POINT
TEMPERATURE MULTIPLIER
°F °C
38 3
40 4
45 7
50 10
1200 1600 2000
scfm scfm scfm
1200 1600 2000
1000 1330 1660
4.1 3.9 4.7
2.9 2.8 3.4
TABLE 3
Pressure drop correction factors (multipliers)
AIR FLOW
120°F
2.0 x rated flow
49°C
1.5 x rated flow
0.56
1.2 x rated flow
0.66
0.70
0.74
0.80
0.84
0.89
1.0
1.1
1.2
1.3
2300
scfm
2300
1910
5.0
3.6
OPERATING PRESSURE psig / kg/cm
60 / 4.2 100 / 7 180 / 12.6 200 / 14.0
5.4 3.5 2.1
3.2 2.1 1.2
2.1 1.4 0.8
2
1.9
1.1
0.7
9