Circular Stack Port Checker

EPA Method 1 – Circular Stack Port Checker

Stack Diameter:

Unit:
Inches Feet Meters Centimeters Upstream Distance:

Downstream Distance:

🔵 Circular Stack – EPA Method 1

✅ Key Points:

Method 1 is used to determine acceptable straight-run locations for installing sampling ports.

For circular stacks or ducts, sample ports must be placed in a straight, unobstructed section of duct.

✅ Formulas:

Let:

$D$ = stack diameter (in meters, feet, inches, etc.)

$L_{up}$ = upstream straight-run distance
$L_{down}$ = downstream straight-run distance

📌 Required Distances:

• Upstream distance:

$$L_{up} \geq 8 \times$$

• Downstream distance:

$$L_{down} \geq 2 \times$$

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✅ Additional Notes:

1. These requirements help ensure fully developed flow profiles, critical for accurate sampling.
2. If required distances cannot be met, consult EPA Method 1 for alternative locations and documentation requirements.
3. Unit consistency is important: use the same units (e.g., inches, meters) for all dimensions.