
Double-head system with a rotary or vibratory casing drive and a hydraulic drifter for the inner rods. Independent counter-rotation and relative axial travel allow adjustment of the bit lead for pipe umbrellas, investigation and anchor drilling. DTH operation requires a shock-damped flushing head.
| Technical data | |
|---|---|
| System diameter | 88.9–219.1 mm |
| Drive | Outer: rotary/vibration drive; inner: hydraulic drifter |
| Pipe/rod lengths | 500–6000 mm |
| Cuttings return | Annulus between outer casing and inner drill string |
| Threads | Right-/left-hand, tapered or parallel |
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