Leffer Hydraulic Casing Oscillators For Foundation Rigs
Updated: 07.09.2023
Hydraulic casing oscillators (short version) are mounted in front of hydraulic drilling rigs when the torque of the rotary is insufficient to drive or extract the casing in case of large drilling diameter and/or depths or due to high soil friction. If the drilling rig has the necessary hydraulic power the oscillator can be controlled by the on-board hydraulics of the carrier otherwise by a separate hydraulic power pack.
Hydraulic casing oscillators are required if the torque of the rotary of the drilling rig is insufficient to drive or extract the casing. Reasons for that are mostly piles of large diameter and/or of great depth or due to high soil friction.
| Model | Casing Ø | Lifting force | Torque |
|---|---|---|---|
| mm | N | kNm | |
| VRM 100 KL | 500 - 1,000 | 920 | 800 |
| VRM 118 KL | 620 - 1,180 | 1,200 | 1,250 |
| VRM 120 KL | 620 - 1,200 | 1,200 | 1,250 |
| VRM 130 KL | 750 - 1,300 | 1,700 | 1,600 |
| VRM 150 KL | 750 - 1,500 | 1,700 | 1,850 |
| VRM 200 KL | 1,200 - 2,000 | 2,250 | 2,700 |
| VRM 220 KL | 1,500 - 2,200 | 2,250 | 2,900 |
| VRM 250 KL | 1,800 - 2,500 | 2,950 | 3,250 |
| VRM 100 KL | |
|---|---|
| Casing Ø | 500 - 1,000 mm |
| Lifting force | 920 N |
| Torque | 800 kNm |
| VRM 118 KL | |
| Casing Ø | 620 - 1,180 mm |
| Lifting force | 1,200 N |
| Torque | 1,250 kNm |
| VRM 120 KL | |
| Casing Ø | 620 - 1,200 mm |
| Lifting force | 1,200 N |
| Torque | 1,250 kNm |
| VRM 130 KL | |
| Casing Ø | 750 - 1,300 mm |
| Lifting force | 1,700 N |
| Torque | 1,600 kNm |
| VRM 150 KL | |
| Casing Ø | 750 - 1,500 mm |
| Lifting force | 1,700 N |
| Torque | 1,850 kNm |
| VRM 200 KL | |
| Casing Ø | 1,200 - 2,000 mm |
| Lifting force | 2,250 N |
| Torque | 2,700 kNm |
| VRM 220 KL | |
| Casing Ø | 1,500 - 2,200 mm |
| Lifting force | 2,250 N |
| Torque | 2,900 kNm |
| VRM 250 KL | |
| Casing Ø | 1,800 - 2,500 mm |
| Lifting force | 2,950 N |
| Torque | 3,250 kNm |