Drilling rods SBU-100 |
Drilling bars SBU-100 are for shot-hole drilling by SBU-100 type drilling machine tools. They use downhole hammer. The rods consists of a steel hot-rolled pipe 89x5 mm, GOST 8732-78, and welded ends with threads of rectangular cutout, 72х10 mm. Welding is argon-arc with quality controlling by method of defectoscopy. The rods are used when there is a percussion-rotary drilling of shot- hole pipes using downhole hammers. Such method of drilling is most effective in hard grounds, because they are fragile and can be easily broken when there is dynamical load. |