RUS / ENG
Вид:
я
215.9 622Y (8 ½" 622)
The bit is designed for drilling of medium-hard abrasive rock formations, e.g. hard limestone and shale, dolomite, magnesite, ferrous quartzite, diorite, quartzeous porphyry, solicited shale, fine-grained skarn, weak pegmatite, martite ore and metamorphic granite rocks, most frequently found in gold, granite and copper mines.
Recommended drilling parameters for maximum efficiency of the bit: low and medium rotation speed (60-115 RPM) and axial load from 60 to 170 kN.
Rock strength range - from 24 000 to 44 000 PSI.
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Технические характеристики
Bit diameter, mm:
215.9
Bit diameter, inch:
8 ½
Bit designation, IADC:
622Y
Connection thread, API:
4 ½" REG
Bearing type:
Air-cooled, on rolling bearings
Formation type:
For medium-hard abrasive formations
Rotation speed. RPM:
115-60
Max. applicable load, kN:
60-170
Weight, kg:
33.9
Bearing/cooling type:
Roller – Ball – Roller / Air cooling
Blow-through type:
Side / center
Cutting structure:
Tungsten carbide inserts
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