8
INLET COMPRESSED AIR CONDITIONS
INLET INLET TEMPERATURES
PRESSURES 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 3.5 1.35 1.05 0.84 0.69 0.56
80 5.6 1.50 1.17 0.95 0.79 0.66
100 7.0 1.55 1.23 1.00 0.82 0.70
125 8.8 1.63 1.31 1.07 0.91 0.74
150 10.5 1.70 1.37 1.13 0.95 0.80
175 12.3 1.75 1.42 1.18 0.99 0.84
200 14.0 1.80 1.47 1.22 1.03 0.89
TABLE 2
Air capacity correction factors (Multipliers)
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 35°C, 95°F.
OUTLET DEWPOINT
DEWPOINT
TEMPERATURE MULTIPLIER
°F °C
38 3 1.0
45 7 1.2
50 10 1.3
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; and a 40°F dew point
temperature is desired?
Answer: 400 x 1.22 x 1.12 x 1.1 = 601 scfm..
TABLE 1
Rated capacity (scfm) and pressure drop @ 100 psig inlet
pressure, 100°F inlet temperature, and 100°F ambient
temperature
MODEL 200 250 300 400 500
Rated capacity 60 Hz 200 250 300 400 500
of air-cooled 50 Hz 170 210 250 340 420
models (scfm)
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.
Element o-ring
Separator Element
Bowl o-ring
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