Capacity Correction Factors
The published standard capacities for compressed air mist eliminators are based on 100 psig inlet pressure and 100°F inlet temperature. When these conditions vary, a given mist eliminator will be able to filter either more or less compressed air than its standard capacity.
There are two ways in which this information can be used. The first is to start with a specific mist eliminator size and recalculate its capacity based on the known operating conditions using the correction factors given below. The other, with a given set of operating conditions, is to select the proper mist eliminator size based on applying the correction factors to the flow rate. Examples based on applying the correction factors are shown below.
Capacity correction factors for differing system air pressure
System Pressure (psig) | 20 | 40 | 60 | 80 | 100 | 120 | 140 | 160 | 180 | 200 | 220 | 240 | 250 |
Correction Factor - C1 | 0.30 | 0.48 | 0.65 | 0.83 | 1.00 | 1.17 | 1.36 | 1.52 | 1.70 | 1.87 | 2.05 | 2.22 | 2.31 |
Capacity correction factors for differing system air temperature
System Temperature (°F) | -20 | 0 | 20 | 40 | 60 | 80 | 100 | 120 | 140 | 160 | 180 | 200 |
Correction Factor - C2 | 1.52 | 1.41 | 1.31 | 1.22 | 1.14 | 1.07 | 1.00 | 0.94 | 0.88 | 0.83 | 0.79 | 0.75 |
To Size the Mist Eliminator Capacity for Actual Conditions
Adjusted Capacity = scfm x C1 x C2
To calculate the capacity of a given mist eliminator based on non-standard operating conditions, multiply the standard capacity by the appropriate correction factor.
EXAMPLE:
Mist Eliminator Model: MIS-1000
Standard Capacity: 1000 scfm
Actual Operating Conditions: 80 psig inlet pressure: C1 = 0.83
120°F inlet temperature: C2 = 0.94
Adjusted Capacity = 1000 scfm x 0.83 x 0.94 = 780 scfm
To Select the Mist Eliminator for Actual Conditions
Adjusted Capacity = scfm/C1/C2
To choose a mist eliminator based on a given flow at non-standard operating conditions, divide the given flow by the appropriate correction factors.
EXAMPLE:
Given Flow: 1000 scfm
Actual Operating Conditions: 80 psig inlet pressure: C1 = 0.83
120°F inlet temperature: C2 = 0.94
Adjusted Capacity = 1000 scfm / 0.83 / 0.94 = 1282 scfm
Adjusted Mist Eliminator Model Size: MIS-1500