What are the Standards of Mine Ventilation?
Coal Mines Regulations no. 130 have laid down certain standards to be maintained in all coal mines to ensure the safety of a mine and the miners working there. The norms for such are as follows:
Unless it is sealed, the atmosphere in any part of a mine, should be such that (1) % of o2 must not be less than 19, (2) % Co2 must not exceed o.5 , (3) % of methane must not exceed 1.25, and not more than 0.75% in the general body of return air, (4) the quantity of air in the last ventilation connection in a district must not be less than 6m3/min/person employed on the largest shift, or 2.5m3/min/ton of daily coal output (which one is larger should apply ). (5) the wet bulb temperature must not exceed 33.50 C at the working face. If all the above conditions are fulfilled in a mine, the mine is said to be adequately ventilated. If any one of the above remains unfulfilled, the mine is not adequately ventilated
