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Hammer Drilling
Hammer Drilling (air-percussion drilling) is a method used for penetrating hard rock types to a depth of around 1000m. Rather than rotating an auger bit, a hammer bit is hammered through the rock by compressed air. Rock chips are brought to the surface by the returning air.
Air pressure needed to run the hammer ranges from 150 to 600 PSI depending on rock, water table and hammer specs.
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