What kind of compressor (CFM,psi) should be employed to drill several 6.5" dia., 30 m. deep vertical bore holes in rock for the installation of ground anchors under a bridge. A track drill EMC 350 with an Air Rotary Head ARH 351 (Torque 270 kg-m) and a 5" down the hole hammer are to be used. I appreciate all your comments.
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DTH Drilling Air Capacity Question 1
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