... drilling rig 1,Excellent Drilling Power 2, Quick Drilling Speed 3,Imported Engine 4,Low Oil Consumption Rotary Drilling Rig ZR160ZR series rotary drilling rig ... pressure31.5MpaSystem flow2*220 L/minMax. drilling dia.Φ600~Φ1500mmMax. drilling depth55mMax. output torque160KN.mDrilling speed6~21r/ ... and efficient construction of equipment. rotary drilling rig max. drilling depth 55m construction machine