Mine Ventilation | |
Unit - 1 | MINE AIR Different Gases / Damps found in mines, Definition of damps, their threshold limits, physiological effects, source of production and detection, Degree of gassiness of seam. Flame safety lamps, its principle, construction, safety features, and comparison. Detection of Methane by flame safety lamp. Methanometer its principle of working, construction. Principle of other method of detection of methane (description of equipment not required). |
Unit - 2 | MINE CLIMATE Purpose and standards of ventilation, standards for minimum & maximum velocity of air for different locations. Pressure, ventilating press, waterguage. Temperature, sources of heat in mines. Moisture content of mine air relative humidity, wet bulb temperature, measurement of relative humidity. Cooling power of mine air, determination of coiling power, methods of improving cooling power of mine air, effect of heat and humidity on miners. |
Unit - 3 | NATURAL VENTILATION Natural ventilation Pressure, geothermic gradient, Factors causing NVP, Effect of seasonal changes on direction of Natural ventilation, limitation of Natural ventilation. Motive column, calculation of natural ventilation pressure. |
ARTIFICIAL VENTILATION Different types of fans used in mines: centrifugal & axial flow, their principle of working, Exhaust & forcing type. Purposes of evasee & volute casing. Reversal of air current, and characteristics curves of fans. Fans in series and parallel, Comparison between axial flow &Centrifugal fan; exhaust & forcing Fan. Fan laws, Manometric efficiency overall efficiency, theoretical depression produced by fan. Numerical on fan laws. | |
DISTRIBUTION & COURSING OF AIR IN MINES Laws of air flow in Mines, Atkinson’s formula splitting, advantages & disadvantages, Numerical on splitting, equivalent orifice. Numerical on equivalent orifice. Ventilation appliances, Auxiliary ventilation: Different methods, advantages & disadvantages, hazards associated with auxiliary ventilation, precautions required. Booster fan: purpose, dangers associated, Precautions before installation. Numerical on Booster fan, Ascensional and Descensional ventilation, Advantages and disadvantages. | |
Unit - 6 | VENTILATION SURVEY Scope and importance of ventilation survey, survey interval and location of survey station, ventilation plan. Measurement of quantity & pressure difference, anemometer, pitot static tube, Manometer. Conduct of Pressure & quantity survey, precautions during and before conducting ventilation survey. |
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