What people are saying - Write a review
We haven't found any reviews in the usual places.
Airflow patternstight rib 4 feet
Effect of face distance on methane concentration
1.0 pet methane 2-foot tight rib 22 feet wide 4-foot tight 6.5 feet high active face air delivered airflow and methane area ventilating efficiency Bituminous Coal Mines blowing line brattice brattice systems tested Bureau of Mines cfm airflow decreasing tight rib delivered air volume distribution patterns developed effectiveness of face efficiency of blowing entries l2 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 ventilating efficiency face ventilation deteriorates inby increasing face distance installed 4 feet jute last open crosscut line brattice installed line brattice system methane concentrations methane dilution methane distribution patterns methane emissions methane Line brattice Method of ventilation one-third the entry percent pet methane Line primary air current Rib 4 Feet secondary air currents tance tight rib distance Underground Bituminous Coal Ventilation in Underground volume of air volume of methane