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35 feet additional 6 feet air quantity air velocity auxiliary face ventilation auxiliary systems auxiliary ventilation system bend and joint bend loss BITUMINOUS COAL MINES blowing system Bureau of Mines calculate system resistance center-line radius Characteristics of Flexible directional change duct velocity pressure equivalent friction loss exhaust system exit loss face ventilation system feet of tubing feet per minute friction and shock friction factor graph inch water gage inches of water inlet conditions investigations 7085 jig installation Jig-Supported joint loss kinetic energy leakage MINES Airflow Characteristics minute FIGURE Number quantity of air reentrant reinforced flexible tubing resistance factors shock loss caused shock loss resulting sling installation sling supported Spiral-Reinforced Ventilation Tubing static entrance loss static pressure loss static pressure profile straight runs straight tubing terms of static thousand cubic feet total equivalent friction total equivalent length Tubing By R. G. tubing diameter tubing system UNDERGROUND BITUMINOUS COAL various diameters VENTILATION IN UNDERGROUND