Face Ventilation in Underground Bituminous Coal Mines: Airflow and Methane Distribution Patterns in Immediate Face Area-line Brattice |
Common terms and phrases
0-1.0 pct methane 12 feet wide 4-foot tight rib 6.5 feet high active face air delivered airflow and methane area ventilating efficiency Bituminous Coal Mines blowing line brattice brattice Line brattice brattice systems tested Bureau of Mines effectiveness of face efficiency of blowing entries 12 feet entry 6.5 feet entry width Exhaust line brattice exhaust systems EXHAUSTING FIGURE face air velocities face airflow patterns face area ventilating face distances exceeding Face Face Face Line brattice face ventilating efficiency FACE-AREA VENTILATION EFFICIENCY flow patterns inby increasing face distance installed 4 feet installed at tight last open crosscut line brattice installed Line brattice Line line brattice system methane dilution methane distribution patterns methane emissions methane Line brattice Method of ventilation one-third the entry pct methane Line percent primary air current Rib 2 Feet secondary air currents tance tight rib distance Underground Bituminous Coal Ventilation in Underground volume of air volume of methane