Mine Gases - Usmra.com

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Physics of Gases• Specific Gravity : The combinations of gases that makeup air is what other gases are compared with. Air isconsidered to have a specific gravity of 1.0• Temperature: Cold gases will diffuse slowly, hot gaseswill diffuse quickly.• Graham's Law: The rate of diffusion, the lower thespecific gravity, the faster it will diffuse.• Barometric Pressure: The lower the pressure, thefaster a gas will diffuse.• Solubility: The ability to dissolve in water.
Exposure Limits• Threshold Limit Value (TLV)The allowable amount of gasexposure for an 8 hour day for 5days a week without harmfuleffects.• Short Term Exposure Limit(STEL) The allowable amountof gas exposure for 15 minuets.
Page 1 and 2: Mine RescueGasDetectionPa. Bureau o
Page 3: Category of Gases• Noxious - Asph
Page 7 and 8: Mine Gases & their ComponentsAIR•
Page 9 and 10: Oxygen Present % Effect• 21% Brea
Page 11 and 12: Acetylene- Chemical Formula: C 2 H
Page 13 and 14: Noxious Gases(Non Explosive)• Nit
Page 15 and 16: Toxic Gases(Explosive)• Carbon Mo
Page 17 and 18: Toxic Gases (Non-Explosive)• Nitr
Page 19 and 20: Smoke• Tiny particles of solid an
Page 21: Detection Devices• Hand held dete

Mine Gases - Usmra.com

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