M1 Ventilation — Tunnel Sentinel

Ventilation Inputs —

Return-air velocity 1.00

0m/s3.00

Effective area at section 50

5m²120

Manpower 50

0persons300

BHP (Diesel equipment) 600

0total BHP2,500

Cross section area - Excavation 60

25m²120

Methane risk present

Actual airflow—

Airflow adequacy—

Shortfall / surplus—

Q₁ Man + BHP 1413 Q₂ Dust / Fumes 1080 Q₃ Methane Risk 7200

Interactive comparison of minimum airflow criteria · Tunnel area 25–120 m² · Airflow in m³/min

Governing requirement: METHANE RISK → 7,200 m³/min

TARP: AMBER

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Use section-average return-air velocity from a proper traverse

IS 4756:1978, Cl. 7.4.1 (Reaffirmed 2022) — Fresh air per person & diesel airflow | BS 6164:2019 — Return-air velocity for dust/fumes & methane risk | DGMS recommendations — Required ventilation air supply in gassy tunnels

Tunnel Ventilation — Requirement & Field Verification