Titan concentric overburden drilling system is used with permanent or retrievable casings to consolidate loose, unconsolidated material such as soft soil, clay, silt, sand, gravel and boulders above basic rock.
Concentric Drilling System is comprised of :
A pilot bit, guide string, drill the center part of the hole, and attach to DTH hammer shank like DHD, QL, SD, Mission, BR, NUMA...or Top hammer thread.
A casing shoe, is attached to the casing pipe and pull down casing pipe.
A symmetric ring bit, is locked onto the pilot bit drills the void for the casing pipe.
Match Casing Tube: 76mm-2000mm or customized.
Regular Size:
| Casing | Casing | Thickness | Hole Dia. | DTH Hammer | Max. Drill Bit Size | Weight(Kgs) |
| O.D | I.D. | (mm) | (mm) | |||
| 114 | 101 | 7 | 118 | 3.5" | 85 | 13 |
| 127 | 108 | 9 | 133 | 3.5" | 95 | 15 |
| 146 | 126 | 10 | 150 | 4" | 115 | 18 |
| 168 | 148 | 10 | 174 | 5" | 140 | 30 |
| 178 | 158 | 10 | 184 | 5" | 148 | 40 |
| 194 | 174 | 10 | 206 | 6" | 160 | 50 |
| 219 | 199 | 10 | 234 | 6"/8" | 185 | 62 |
| 245 | 225 | 10 | 258 | 8" | 210 | 75 |
| 273 | 253 | 10 | 305 | 8" | 235 | 120 |
| 323 | 303 | 10 | 345 | 10" | 275 | 150 |
| 406 | 380.6 | 12.7 | 420 | 12" | 348 | 335 |
| 457 | 431.6 | 12.7 | 477 | 12" | 374 | 440 |
| 508 | 476 | 16 | 524 | 12" | 442 | 520 |
| 558 | 526 | 16 | 575 | 18" | 489 | 610 |
| 609 | 577 | 16 | 637 | 18" | 551 | 670 |
| 660 | 628 | 16 | 678 | 18" | 588 | 780 |
| 711 | 679 | 16 | 731 | 24"/28" | 637 | 930 |
| 762 | 730 | 16 | 781 | 24"/28" | 688 | 1070 |
| 812 | 780 | 16 | 834 | 24"/28" | 732 | 1285 |
| 863 | 831 | 16 | 882 | 24"/28" | 786 | 1450 |
| 914 | 882 | 16 | 935 | 24"/28" | 833 | 1720 |
| 1016 | 984 | 16 | 1033 | 24"/28" | 909 | 2200 |
