KELLY BARS

 
A kelly bar is the key element of the rotary drilling rig that transfers the torque and the pull-down from the rig to the drilling tool. The Kelly bar comprises of high strength but ductile telescoping steel tubes with special guide strips, drive strips, pull-down keys and locking elements welded onto the tubes.

The gearbox of the drilling rig engages the drive strips and the pull-down keys of the outermost tube to apply the torque and the pull-down respectively to the kelly bar while the locking element on the inside of any given tube engages the drive strips and pull-down keys of the next inner tube to transfer to the inner tube the same torque and pull-down. This transfer of torque and pull-down proceeds from the outermost tube to the innermost one which has a square drive stub at its lower end that connects to the drilling tool.

 

HEMCO manufactures kelly bars to world class standards using the best quality high strength seamless steel pipes from European steel mills and weld-on elements made from special heat treated steels.

Parameters

Description
Outer Diameter (mm)
No. of Sections
Max Drilling Depth (mm)
Torque (KN-m)
Drilling Rigs
HK 40/470/3
470
3
48
400
BG-40 / BG-36
HK 40/470/4
470
4
72
400
BG-40 / BG-36
HK 28/419/3
419
3
36
280
BG-28
HK 28/419/4
419
4
64
280
BG-28
HK 28/394/3
394
3
36
280
BG-28 / BG-25
HK 28/394/4
394
4
64
280
BG-28 / BG-25
Kelly bars for other rigs can be supplied on request.
 

 

 

 

Germany

Kompetenz f ü r den Spezialtiefbau,
Finkenweg 3, 56729 Ditscheid
Tel: +49 160 941 910 45
Email: germany@hemcoequipment.com

 

Singapore

600 North Road
Park View Road 188778,  
Singapore
Email: fareast@hemcoequipment.com