Kelly Spring: Essential Component in Borewell and Rotary Drilling
When it comes to deep borewell drilling or rotary drilling rigs, one small but critical component ensures smooth torque transmission and safety — the Kelly spring. While it may seem like a minor part, its role is indispensable in drilling operations.
This blog explores what a Kelly spring is, how it works, its importance in drilling rigs, types, and key selection tips.
? Focus Keyword: Kelly Spring
? LSI Keywords: Rotary drilling spring, Kelly bar accessories
?? What is a Kelly Spring?
A Kelly spring is a mechanical spring component used in rotary drilling rigs to provide shock absorption, torque transmission, and axial flexibility in the Kelly drive system. It helps connect the Kelly bar to the rotary table or drive head while compensating for vertical movement during drilling.
This spring plays a vital role in reducing wear on the drive mechanism and maintaining alignment during rotation and feed operations.
? Function of a Kelly Spring in Drilling Rigs
- ? Torque Transmission – Transfers rotary motion from the drive head to the Kelly bar
- ? Absorbs Vertical Thrusts – Helps handle fluctuations during drilling
- ?? Maintains Rig Stability – Keeps the Kelly bar properly aligned
- ?? Prevents Overloading – Protects both mechanical and hydraulic components
?? Types of Kelly Springs
1. Helical Kelly Springs
- Spiral-wound design
- Ideal for moderate loads and flexibility
2. Flat Coil Springs
- High strength with minimal deflection
- Used in heavy-duty rotary applications
3. Multi-leaf Springs
- Made of stacked flat steel strips
- Distribute load uniformly and resist fatigue
?? Applications of Kelly Springs
Kelly springs are primarily used in:
- ? Borewell Drilling Rigs
- ? Rotary Piling Rigs
- ? Water Well Drilling Machines
- ? Oil & Gas Exploration Equipment
- ? Geotechnical Investigation Rigs
? Key Advantages
- ?? Enhances Operational Safety
- ?? Minimizes Equipment Wear
- ?? Improves Torque Efficiency
- ?? Supports Continuous Drilling in Uneven Strata
? Sample Technical Specifications
| Parameter | Specification |
|---|---|
| Material | High-grade alloy or spring steel |
| Spring Type | Helical / Flat Coil |
| Load Bearing Capacity | 500 kg to 5000 kg |
| Outer Diameter | 100 mm to 300 mm |
| Compatibility | All standard rotary rigs |
? Internal Links
? Image Alt Tag
Image Alt Text: Kelly spring installed in rotary drilling rig system
? How to Choose the Right Kelly Spring
When selecting a Kelly spring, consider:
- ? Machine Compatibility
- ? Drilling Depth and Load
- ? Torque Range of the Rig
- ? Build Material and Coating
- ? Service Life and Warranty
? Call to Action (CTA)
Need a durable and precision-engineered Kelly spring for your rig?
?? Get in touch for custom sizes, bulk pricing, or datasheet downloads.
? Email: info@titansteel.in / sales@titansteel.in
? Phone: +91 738 586 3226
? Address: H No. 181, Dahivali, Khopoli-Pali road, Tal. Khalapur Dist. Raigad 410203, Maharashtra INDIA.
