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Mining Publication: Evaluation of a Sheathed Permissible Explosive Charge for Open Shooting in Flammable Atmospheres
Keywords: Explosives Permissible explosives
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: April 1982
Authors: RJ Mainiero, JE Hay
Contract/MOA Report - April 1982
Download PDF Document (1.06 MB)
NIOSHTIC2 Number: 10002327
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TPR-118, :1-9
The Bureau of Mines has developed a prototype nonincendive explosive rock-breaker charge that can be fired unconfined in underground bituminous coal mines without the danger of igniting a flammable atmosphere that might be present. At present, unconfined shooting in underground coal mines is prohibited, but there are situations where the use of such shots would yield an overall improvement in safety. The charge consists of 1-1/2 lb of permissible water gel explosive in the form of a short cylinder 7 inches in diameter and 7/8 inches high, surrounded by a 1/2-inch-thick layer of damp salt, and encased in latex rubber reinforced with cheese cloth. The latex rubber housing provides a charge package that is strong enough to resist rough handling yet is pliable enough to conform to an irregular stone surface. A charge of this shape was found to be more effective at breaking rock than charges with lined or unlined cavities. Incendivity tests in a gallery have shown that the prototype charge will not ignite a flammable methane-air atmosphere when fired. In cooperation with the Mine Safety and Health Administration (MSHA), a test protocol for the certification of these charges as "permissible" for use in flammable atmospheres is being developed.
Image of publication Evaluation of a Sheathed Permissible Explosive Charge for Open Shooting in Flammable AtmospheresContract/MOA Report - April 1982
Download PDF Document (1.06 MB)
NIOSHTIC2 Number: 10002327
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, TPR-118, :1-9
See Also
Behavior of Nitrogen Oxides in the Product Gases from Explosive Detonations
The Calculated Risk of Experiencing a Lightning Caused Unplanned Detonation
A Century of Bureau of Mines/NIOSH Explosives Research
Gas and Fume Generation at the Blast Site
Handling Explosives in Underground Mines
Performance of RETIMET Metal Foam Vents on Explosion-Proof Enclosures
A Primer on Explosives for Coal Miners
Removing Booster Influences From Toxic Fumes
Secondary Explosion Hazards During Blasting in Oil Shale and Sulfide Ore Mines
Short-Delay Blasting in Underground Coal Mines
Page last reviewed: November 18, 2015
Page last updated: November 18, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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