EPA Method 2C Overview | Gas Velocity & Flow Rate in Small Ducts

A detailed overview of USA EPA Method 2C, covering the determination of gas velocity and volumetric flow rate in small ducts and stacks. EPA Method 2C is deployed when stack or duct diameters are too small for a standard Type S pitot tube setup (typically under 12 inches / 0.30 meters). Instead, this method relies on a standard pitot tube to avoid aerodynamic interference. This tutorial breaks down the strict criteria, physical setups, and calculations necessary for successful compliance. 📌 What You'll Learn: • When to use Method 2C instead of standard Method 2 or 2A • Dimensional constraints and minimum straight-run requirements • Standard pitot tube geometry and calibration rules • Step-by-step measurement procedures and velocity calculations • Essential QA/QC checks to prevent flow disturbance errors If this video helped clear up your small duct flow testing questions, please give it a thumbs up, drop a comment below, and subscribe for more specialized stationary source emissions testing guides! #EPAMethod2C #StackTesting #SmallDuctVelocity #EnvironmentalEngineering #AirEmissions