U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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In the winter, gas heaters or torches are used extensively to provide comfort to miners and to de-ice equipment. If gas heaters are placed in confined areas or unventilated areas, dangerous hazards can occur. As the gas (usually propane) is burned, oxygen in the air is depleted. This can cause two problems; anyone in the area may be overcome by a lack of oxygen, or the lack of oxygen can cause the propane heater to self extinguish. If the latter occurs, the heater can continue to discharge propane into this space. Attempts to re-light the heater can ignite the unburned fuel (gas) in the atmosphere and cause an explosion. To prevent these types of accidents, all mining operations should review their procedures for heating unventilated spaces. The following precautions should be incorporated in any thawing procedures:
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