Handbook for Methane Control in Mining - AMMSA

TABLES6–1. Major coal mine explosions in the United States, 1970–present .................................. 786–2. Gassiness of coal seams ................................................................ 796–3. Methane capture ratios for postmining methane drainage techniques .............................. 8814–1. Initiating events for tunnel methane explosions ............................................. 180UNIT OF MEASURE ABBREVIATIONS USED IN THIS REPORTcc/g cubic centimeter per gram L/kg liter per kilogramcfd cubic foot per day lb poundcfm cubic foot per minute lb/ft 3 pound per cubic footcm centimeter m metercm 3 cubic centimeter m 3 cubic meterft foot m/sec meter per secondft 2 square foot m 3 /sec cubic meter per secondft 3 cubic foot mD millidarcyft 3 /st cubic foot per short ton min minuteft/min foot per minute mm millimeterft 3 /min cubic foot per minute oz/ft 3 ounce per cubic footg gram ppm part per milliongpm gallon per minute psi pound per square inchhr hour psig pound per square inch gaugein inch rpm revolution per minutein 3 cubic inch scfm standard cubic foot per minutekg/m 3 kilogram per cubic meter sec secondkg/sec kilogram per second vol % volume percentkV kilovolt °C degree CelsiusL liter °F degree Fahrenheit