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Basic Mine Ventilation

76 Basic Mine Ventilation 77 IntroductionxFace Ventilation Stoppings Check Curtains Air Measurements xPrincipals of Airflow xRespirable Dust Control xUse of Scrubbers xActions for Excessive Methane xRock Dusting xPermissibility7879808182838485868788899 091929394959697 Outby End of Curtain Scrubber Off 4,000 cfm Scrubber On 4,300 cfm Inby End of Curtain Scrubber Off 3,000 cfm Scrubber On 7,500 cfm 9899100101102103104

sides of all underground areas of a coal mine and maintained in such quantities that the incombustible content be not less than 65 percent in intakes and 80 percent in retums. When methane is present the ventilating air current the percent of incombustible content shall be increased. Recent NIOSH studies indicate that the incombustible

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