Page 236 - Advanced Mine Ventilation

Origin of Gases in Coal Mines 215

TLV-C ppm e e e 20,000 e e e e 5 e

TLV-STEL ppm e e 15,000 e e 400 15 5 e e

TLV-TWA ppm e e 5,000 e e 50 10 2 25 e

increased explosive explosive

Effects simple explosive explosive

Harmful Nontoxic Nontoxic, asphyxiant Asphyxiant, respiration Asphyxiant, Asphyxiant, Toxic, Toxic, Toxic Toxic Explosive Adapted from Anon: Threshold limit values for chemical substances and physical agents in the workroom environment with intended changes, American Conference of Governmental Industrial

Density lb/ft 3 0.083 0.073 0.115 0.042 0.080 0.073 0.890 0.170 0.119 0.005

Gravity

Gases Specific 1) [ (Air 1.1056 0.9673 1.5291 0.5545 1.03 0.9672 1.1912 2.2636 1.5895 0.0695
Mine

Common Symbol C 2 H 6 NO 2

of O 2 N 2 CO 2 CH 4 CO H 2 S SO 2 NO, H 2 USA.
Properties monoxide sulfide nitrogen Ohio, Cincinnati,

13.1 dioxide dioxide of
Table Name Oxygen Nitrogen Carbon Methane Ethane Carbon Hydrogen Sulfur Oxides Hydrogen Hygienists,