Vari-Stem Contains Explosive Energy Within Rock Mass
Published: Monday, 18 August 2014 10:25
Vari-Stem Plugs work by creating a blocking effect within the drill hole by wedging the stemming material between the drill hole wall and plug. Upon detonation of the explosives, the plug is forced upward into the stemming material and "locks up." The explosive gases and energy are prevented from traveling (venting) up through the drill hole, and instead are contained within the rock mass for milliseconds longer than non-plugged blasts.
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Drilling and Blasting Safety is Critically Important
Published: Monday, 07 July 2014 15:20
MSHA’s Accident Prevention Program includes tips on drilling and blasting safety. Following are several items the agency wants to bring to the attention of plant operators or contractors performing drilling and blasting operations in quarries.
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