drilling rig,water well drilling rigs
8.Water well drill rig must stop the shift change when hanging on the plate hands round or let the clutch a little until the gears will stop before hanging files, is strictly prohibited gear at high speed. Twist tube operation or limp drill hanging on file, the only disk handwheel car is strictly prohibited.

9.In the entire drilling process must ensure that the complete borehole drilling a drill pipe length, lift the drill pipe test holes, such as drill pipe continuous rotary few laps must be a fine plan Kong until the borehole is complete.