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3.6 Stack Data (Mandatory)
1. Diameter.
The inside diameter, in feet, for those emission points designated as stacks (include
vents). For tanks, use 3.0 feet as the default. For non-circular stacks, use:
Diameter = square root of (1.27 x area)
Area = Cross-sectional area perpendicular to flow
2. Height.
The height in feet (ft) above ground level for all circular and non-circular stacks/vents.
For tanks, use the actual tank height.
3. Velocity.
The exit velocity, in feet per second (ft./sec), for each emission point designated as a
stack.
For tanks, use 0.01 feet per second.
4. Temp.
The exit temperature, in degrees Fahrenheit (F), for each emission point designated as a
stack.
For tanks, use the average annual temperature of the material.
5. Horizontal Discharge.
Direction of discharge from vent.
Yes = Horizontal
6. Percent Moisture.
Percent moisture content of emission.
3.7 Flare Data (Mandatory)
1. Molecular Weight (LB/LB-MOLE)
The average molecular weight, in pounds per pound-mole (lbs/lb-mole), of the gas stream
constituents.
2. Height (ft.)
The height above ground level, in feet, for each emission point designated as a flare.
3. Temp (Degrees (F))
The flaring temperature, in degrees Fahrenheit (F), for each emission point designated as
a flare.
4. Flow Rate (MSCFM)
Feed rate of the flared gas stream, in thousands of standard cubic feet per minute
(MSCFM).
COMPASS-EI–Manual – Chapter 4
No = Not horizontal
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