If you have questions on how to properly select a compressed air dryer, contact our knowledgeable customer service toll-free: 866-650-1937 or send us an email request.
Use our Drying Sizing Tool below to find the dryer you need based on your system specifications.
How to Size a RTM
To Size the Dryer Capacity for Actual Conditions
Adjusted Capacity = scfm x C1 x C2 x C3 x C4
To calculate the capacity of a given dryer based on non-standard operating conditions, multiply the standard capacity by the appropriate correction factor(s).
EXAMPLE: Dryer Model: RTM-6000
Standard Capacity: 6000 scfm
Actual Operating Conditions: 90°F ambient temperature: C1 = 1.05
100°F inlet temperature: C2 = 1.0
125 psig system pressure: C3 = 1.07
38°F required dew point: C4 = 1.0
Adjusted Capacity = 6000 scfm x 1.05 x 1.0 x 1.07 x 1.0 = 6,741 scfm
To Select the Dryer Model for Actual Conditions
Adjusted Capacity = scfm/C1/C2/C3/C4
To choose a dryer based on a given flow at non-standard operating conditions, divide the given flow by the appropriate correction factor(s).
EXAMPLE: Given Flow: 5000 scfm
Actual Operating Conditions: 80°F ambient temperature: C1 = 1.07
90°F inlet temperature: C2 = 1.21
100 psig system pressure: C3 = 1.0
Required dew point : 38°F pdp: C4 = 1.0
Adjusted Capacity = 5000 scfm / 1.07 / 1.21 / 1.0 / 1.0 = 3,861 scfm
Selected Dryer Model: RTM-4000
Capacity Correction Factors
The Compressed Air and Gas Institute (CAGI)has developed standards to protect users of compressed air & gas equipment. ADF100 the current standard for refrigerated compressed air dryers, specifies the dryers performance to be rated at 100°F inlet temperature, 100°F ambient temperature, and 100 psig system pressure. To adjust the dryer capacity from these "CAGI conditions" to your specific application, please use the correction factors below for differing ambient air temperatures (C1), inlet air temperatures (C2), system pressures (C3), and varying dew point requirements (C4).
|*Capacity correction factors for inlet air temperature (C1) |
|Ambient Temperature (°F) ||70 ||80 ||90 ||100 ||110 ||115 ||120 |
|Correction Factor ||1.10 ||1.07 ||1.05 ||1.00 ||0.94 ||0.85 ||0.65 |
*Applies to air-cooled units only
|Capacity correction factors for differing inlet air temperature (C2) |
|Inlet Temperature(°F) ||80 ||90 ||100 ||110 ||120 ||140 |
|Correction Factor ||1.50 ||1.21 ||1.00 ||0.82 ||0.72 ||0.61 |
|Capacity correction factors for system air pressure (C3) |
|System Pressure (psig) ||50 ||75 || 100 ||125 ||150 ||175 ||200 ||225 ||250 |
|Correction Factor ||0.85 ||0.95 || 1.00 ||1.07 ||1.13 ||1.18 ||1.20 ||1.22 ||1.24 |
|Capacity correction factors for differing pressure dew point requirements (C4) |
|Dew Point (°F) || 38 ||41 ||45 ||50 |
|Correction Factor || 1.00 ||1.12 ||1.17 ||1.22 |