HOW DO I CALULATE EMISSIONS FROM A FIXED ROOF TANK WITH A ROOF GEOMETRY OTHER THAN A CONE OR DOME?
The model is programmed to handle cone and dome roofs which are the most common geometries. Other geometries must use one of these options to calculate the “Roof Outage” (the additional tank shell height in feet that would produce a volume of space equivalent to the space under the roof alone). The Roof Outage is one component of the Vapor Space Outage used in the breathing loss calculation. You must calculate the Roof Outage external to the program based on the geometry of the roof. Once a value of the outage is obtained, modify the program using either the dome or cone roof options by varying either the dome roof radius or the cone roof slope until an equivalent outage is calculated. As an example, if the tank has a flat roof, the “Cone Roof” option can be selected and the slope set to “0”.
