Observing new process followed in LIGHTING SYSTEM IN TUNNEL AND VENTILATION SYSTEM OF TUNNEL Ventilation in Tunnel The main objective to provide proper ventilation in tunnel during tunnel operation are To supply fresh air to the working crew To remove injurious and obnoxious fumes and gases of explosion To safely remove the dust caused by drilling blasting and mucking Natural and Mechanical Ventilation in tunnel : When drift is driven from portal to portal it provides fair ventilation in tunnel during enlarging operations. In long tunnels, this natural ventilation is inadequate and mechanical ventilation Used when drift was driven from portal to portal Used when the tunnel is short and diameter long If it is oriented along wind direction Its efficiency depends on alignment and grade of the flow of traffic Volume of Air Consideration: During working each worker should be supplied with 200 cu.ft to 500 cu.ft of fresh air. A compressed air used for the drills is usually contaminated
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