Mine Methane Dilution Airflow & Gas Drainage Calculator

Compute required fresh ventilation airflow ($Q$) to dilute seam methane emissions below statutory safety thresholds (≤ 1.0% or 0.8% $\text{CH}_4$) and pre-drainage capture requirements.

Methane Emission & Seam Production

Daily Coal Production P (t/day):

Specific Gas Emission (m³ CH₄/t):

Gas Drainage Efficiency (%): Borehole pre-drainage capture

Statutory Methane Limit (% CH₄): Regulatory return air limit (0.8 - 1.0%)

Intake Air Background (% CH₄):

Ventilation Factor of Safety:

Dilution Airflow & Gas Release Balance

Required Fresh Airflow (Q_req)

Methane Influx into Airway

Total Emission q_tot

Captured in Pipes

Lower Explosive Limit

5.0% LEL

Explosive Range & Carbon Equivalent

CH₄ Explosive Range: 5% - 15% | Methane density: 0.668 kg/m³ @ STP

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Mine Methane Dilution Airflow & Gas Drainage Calculator

Methane Emission & Seam Production

Dilution Airflow & Gas Release Balance

Frequently Asked Questions