M1 Ventilation — Tunnel Sentinel

Field Verification — Return Air — —

Return-air velocity 1.00

0m/s3.00

Effective area at section 50

5m²120

Measurement chainage 0+500

0+000m1+000

Face chainage 0+680

0+000m1+000

Reading date / time

Actual airflow—

Airflow adequacy—

Shortfall / surplus—

Required velocity—

Velocity adequacy—

Distance to face—

Last measurement—

TARP: AMBER

—

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

Historical Trend — Airflow Adequacy %

Readings stored in this browser · Required airflow from current calculator inputs · Q_actual = V_return × A_free

Manpower 50

0persons300

BHP (Diesel equipment) 600

0total BHP2,500

Cross section area - Excavation 60

25m²120

Methane risk present

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

Q₁ Manpower + Diesel: 1412 m³/min Q₂ Dust / Fumes: 1080 m³/min Q₃ Methane Risk: 7200 m³/min

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

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