NIOSH Mining Laboratory
Lake Lynn Cannon Gallery |
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| Coal dust ignited by unstemmed ammonium nitrate - fuel oil (ANFO) at the Lake Lynn Cannon Gallery |
The Lake Lynn Cannon Gallery (LLCG) is a 22 ft long by 8 ft diameter horizontal steel cylinder open at both ends. Mounted inside the LLCG near one end is a 5 ft long by 2 ft diameter steel cannon with a 2.25 in diameter by 4 ft long bore. The steel cannon can be easily removed from the gallery to facilitate other types of dust and/or gas ignition studies or demonstrations. The gallery has 15 pair shielded instrumentation cable and 120 vac power lines available which extend to a control shed located approximately 300 ft away and protected behind an earth berm. Natural gas is also plumbed to the gallery with a metering system located at the control shed. Gas sampling and video lines extend from the gallery back to the control shed. In a standard LLCG experiment, the flame and combustion products from a detonating explosive charge exit the cannon toward the geometric center of the gallery, where combustible dust has been pre-dispersed and/or an atmosphere of flammable methane-air is present.
Site: Lake Lynn Laboratory
Facility: Explosives Testing Site (Upper Quarry)