High Strength Kelly Bar A Low Weight High Straightness High Wear
Resistance
Kelly bar is the key part of a rotary rig, transfer the torque of
the rotary power head and the pressure of the rotary rig system to
the drilling tools and its quality affects the performance of the
whole machine directly.
1) Interlocking kelly bar
Interlocking kelly bar is used for drilling in dense sand,gravel
and weak to strong rock .Interlocking kelly bar can be fully locked
by mechanical locking system on each section.Kelly bar can be
equipped with specially designed springs or pressure plates for
shock absorbing purpose.
2) Friction kelly bar
Friction kelly bar is another type which the external key is
composed of 3 or 6 wear -resistant strip without pressunrizing
point .This kelly bar can transform pressure when it is
working.Also can produce peripheral force and pass down the
pressure force,can produce the friction force.This kelly bar has
the advantage of operating sample ,drilling deep ,but with less
pressure transmission.So this one is suitable for the soft and silt
layer.
| Name of product | External diameter (mm) | Pitch No | Length section (m) | Rated torque (KN*M) | Depth (m) |
| Friction kelly bar | 355 | 4,5 | 10-13 | 180 | 36-60 |
| 377 | 4,5 | 10-14 | 200 | 36-65 |
| 406 | 4,5 | 10-15 | 210 | 36-70 |
| 419 | 4,5 | 10-15 | 250 | 36-70 |
| 440 | 4,5 | 10-15 | 250 | 36-70 |
| 470 | 4,5,6 | 10-17 | 280 | 36-95 |
| 508 | 4,5,6 | 10-18.5 | 320 | 36-103 |
| 530 | 4,5,6 | 10-19 | 380 | 36-106 |
| 575 | 4,5,6 | 10-21 | 420 | 36-120 |
| 630 | 4,5,6 | 10-21 | 450 | 36-120 |
| Name of product | External diameter (mm) | Pith No | Length section (m) | Rated torque (KN*M) | Depth (m) |
| Interlocking kelly bar | 355 | 3 | 10-13 | 180 | 27-36 |
| 377 | 3,4 | 10-12.5 | 220 | 27-44 |
| 406 | 3,4 | 10-15 | 230 | 27-57 |
| 419 | 3,4 | 10-15 | 250 | 27-57 |
| 440 | 3,4 | 10-15 | 250 | 27-57 |
| 470 | 3,4 | 10-17 | 280 | 27-65 |
| 508 | 3,4 | 10-17 | 320 | 27-65 |
| 530 | 3,4 | 10-20 | 380 | 27-76 |
| 575 | 3,4 | 10-21 | 420 | 27-80 |
| 630 | 3,4 | 10-21 | 450 | 27-80 |
1. Our kelly bar enjoys a low weight,high strength,high straightness of single
bar,thinner tube,smaller inter-tube distance and good abrasion
resistance.
2. Standard kelly bars are fabricated with a total of 6 drive keys on
each section .The tubular kelly sections are manufactured from high-tensile steel to ensure
minimum weight at adequate strength.
3. Heat treatment is widely used in the key parts such as drive key
to improve wear resistance.
4. Small clearance and high-precision mating of the drill pipe ensure
its good working order and service performance.
5. Fulfill the rotary drilling rig full torque operation.
