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Overburden Casing System

Concentric Casing System Type2

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Model Casing pipe (mm) Max. O.D. of solitary ring bit (mm) Casing shoe (mm) Pilot Bit(mm) Match DTH Hammer
O.D. Wall Thickness O.D. I.D. Max. through casing shoe O.D.
O.D.
219 219 6.3-8 235 202 178 202 177 DHD360 API 3 1/2 REG DHD380 API 4 1/2 REG
10.0-12 194 178 194 177 DHD360 API 3 1/2 REG DHD380 API 4 1/2 REG
273 273 6.3-8 292 256 227 256 226 DHD380 API 4 1/2 REG
10.0-12 248 227 248 226
14-16 240 227 240 226
323 323 10.0-12 341 298 276 298 275 SD10 API 6 5/8 REG
12.5-14 294 276 294 275
16mm 290 276 290 275
351 351 10.0-12 371 326 297 326 296 SD10 API 6 5/8 REG
12.5-14 322 297 322 296
16mm 318 297 318 296
377 377 10.0-12 397 352 323 352 350 SD10 API 6 5/8 REG
12.5-14 348 323 348 346
16mm 344 323 344 342
406 406 10-12.5 421 380 354 380 378 N120(N125)  API 6 5/8 REG
14-16 373 354 373 371