Rotary Drilling an overview ScienceDirect Topics
Rotary drilling is mostly used to drill big holes in large quarries open pit mines petroleum extraction and other fields Fig shows a diagram of a rotary drilling system There are two groups of big rotary drilling 1 rotary crushing by high point loading to the rock from three cones as shown in Fig a and 2 rotary cutting by shear force from drag bits as shown in Fig b
DML Epiroc US
Outer diameter mm Length 3 m Outer diameter " Length 118" ft 30 pipes Outer diameter mm Length 3 m Outer diameter 4" Length 118" ft Water/foam pump Hydraulically driven high pressure pump HPW200/30 45 Metric US Maximum water flow 30 l/min gal/min Maximum water pressure 200 bar 2 900 psi Pump power 10 kW hp