Email: sales@unikelly.com WhatsApp: +86 19108462246
Email: sales@unikelly.com WhatsApp: +86 19108462246
A Bauer BG 30 Kelly Bar is a telescopic drilling tool designed to transfer torque from the rotary drive to the drilling tool while extending the drilling depth of the rig. Selecting the correct Kelly Bar requires checking the BG 30's rotary drive connection, Kelly Bar diameter, number of sections, maximum drilling depth, torque requirements and the intended drilling conditions. The correct configuration should always be confirmed against the specific machine and its technical requirements rather than relying on the BG 30 model name alone.
The Bauer BG 30 is a rotary drilling rig used in foundation engineering projects, including bored piles and other deep foundation applications. Its Kelly Bar connects the rotary drive to drilling tools such as drilling buckets and augers, allowing torque to be transmitted while the bar extends into the borehole.
A Kelly Bar is not simply a standard-length steel tube. It is a telescopic assembly consisting of multiple nested sections. As the rotary drive applies torque, the Kelly Bar transfers rotational force to the drilling tool. During drilling, the sections extend progressively to reach the required depth.
For a BG 30, the Kelly Bar must be selected according to the machine's actual configuration, not just its nominal model designation. Different machine generations, equipment configurations and project requirements may call for different Kelly Bar dimensions and connections.
Before purchasing or replacing a Kelly Bar for a Bauer BG 30, confirm the following technical parameters.
| Specification | What to Check |
| Kelly Bar type | Interlocking or friction |
| Number of sections | Based on required drilling depth and rig configuration |
| Outer diameter | Must match the rotary drive and machine clearance requirements |
| Extended length | Must meet the required drilling depth |
| Retracted length | Must suit the mast and operating configuration |
| Torque capacity | Must be compatible with the rig's available torque |
| Drive connection | Must match the rotary drive interface |
| Kelly box dimensions | Must match the drilling tools and connection requirements |
| Material | Must provide adequate strength and wear resistance |
These parameters should be checked together. For example, selecting a Kelly Bar with sufficient length but an unsuitable torque capacity can affect drilling performance and service life.
Compatibility involves more than matching the brand and machine model. The following points should be confirmed before production or replacement.
Rotary drive connection: The upper connection and drive interface must match the BG 30's rotary drive. Confirm the connection dimensions, locking arrangement and relevant drawings.
Diameter and clearance: The Kelly Bar's outer diameter must fit the machine's operating configuration. Its dimensions should also be compatible with the drilling tools and casing arrangements used on the project.
Drilling depth: The required drilling depth determines the necessary Kelly Bar length and section arrangement. Consider the actual pile depth, drilling method and working conditions rather than choosing a bar based only on its maximum advertised length.
Torque requirements: The Kelly Bar must safely transfer the torque generated by the rotary drive. The required torque capacity depends on the rig configuration, drilling tool and ground conditions.
Tool connection: The lower connection must be suitable for the drilling buckets, augers or other drilling tools used on site. Confirm the Kelly box dimensions and connection details before ordering.
The choice between an interlocking and friction kelly bar depends mainly on the drilling method and ground conditions.
An interlocking kelly bar uses mechanical locking elements between sections to transfer higher torque more directly. It is commonly selected for demanding drilling conditions, including hard soil, dense layers and rock formations where higher torque transmission is required.
A friction kelly bar transfers torque through friction between the telescopic sections. It is generally suitable for drilling in softer ground and applications where the torque demand is within the bar's design capacity.
Neither type is universally better. The right choice depends on the BG 30 configuration, drilling depth, ground conditions, required torque and project method.
To help confirm the correct Kelly Bar configuration, prepare the following information:
Bauer BG 30 machine year and serial number
Existing Kelly Bar type and number of sections
Outer diameter and extended length
Required drilling depth
Rotary drive connection dimensions
Kelly box dimensions or drilling tool connection details
Main ground conditions and drilling method
Photos of the existing Kelly Bar, connection ends and machine nameplate are also helpful. If available, provide the original technical drawing or part number. These details help reduce the risk of ordering a bar that cannot be installed or used correctly.
UNIKELLY, a specialized Kelly Bar brand under DRILLMASTER, provides Kelly Bar solutions for Bauer and other major rotary drilling rig brands. Its product range includes interlocking kelly bars, friction kelly bars and customized configurations for different drilling requirements.
For Bauer BG 30 applications, the appropriate configuration should be confirmed according to the machine's technical details, required drilling depth, torque requirements and connection dimensions. UNIKELLY can work with your machine information and existing Kelly Bar drawings to evaluate a suitable solution.
Looking for a Kelly Bar for your Bauer BG 30? contact UNIKELLY at sales@unikelly.com and provide your machine details. Our team can help review the technical requirements and discuss a suitable Kelly Bar configuration.