Stack Exit Velocity Calculator

Formula

The formula to calculate the Stack Exit Velocity (SEV) is:

\[ SEV = \frac{VFR}{\frac{\pi \times D^2}{4}} \]

Where:

Stack Exit Velocity (SEV): The speed at which gas exits the stack, measured in feet per minute (ft/min).
Volumetric Flow Rate (VFR): The volume of gas flowing through the stack per minute, measured in cubic feet per minute (ft³/min).
Stack Diameter (D): The diameter of the stack, measured in feet.

Let's say the stack volumetric flow rate (VFR) is 5000 ft³/min and the stack diameter (D) is 3 feet. Using the formula:

\[ SEV = \frac{5000}{\frac{\pi \times 3^2}{4}} = \frac{5000}{7.0686} \approx 707.11 \text{ ft/min} \]

So, the stack exit velocity is approximately 707.11 ft/min.