EPA Method 2H Tutorial: Correcting Flow Rate for Near-Wall Velocity Decay

 USA EPA Method 2H Overview: Stack Gas Velocity Wall Effects Explained

In this comprehensive overview, we break down USA EPA Method 2H, the official federal standard for determining stack gas velocity taking into account velocity decay near the stack or duct walls. Standard equal-area traverses can often overestimate emissions data because they don't fully capture the friction slowdown near the boundary layer. Method 2H provides a precise way to correct this.

🔍 What is EPA Method 2H?

EPA Method 2H is an optional addition used in conjunction with Method 2, 2F, or 2G. It allows stack testers to determine a replacement multiplier (WAF) that reduces the measured unadjusted cross-sectional velocity. By accounting for the physical drag on gas moving against the interior of a chimney or duct, utilities and industrial plants can report more accurate, compliant mass emission rates.

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