API Certified Roller Kelly Bushings from China Suppliers | High-Quality Factory Direct Solutions
Roller Kelly Bushing Specifications
1. Light Duty Roller Kelly Bushing
| Model | 20-MDP | 17-MDP | LDS |
|---|---|---|---|
| Max Torque | 13729 N·m (10126 ft·lbf) | - | - |
| Drive Type | Square | - | - |
| Square Kelly Size | 63.5-133.35 mm (2 1/2-5 1/4 in) | - | - |
| Hexagonal Kelly Size | 76.2-107.95 mm (3-4 1/4 in) | - | - |
| Dimensions | 458×458×700 mm (18×18×27.5 in) | 508×508×700 mm (20×20×27.5 in) | - |
| Weight | 460 kg (1012 lb) | 340 kg (750 lb) | 400 kg (808 lb) |
2. Medium-Duty Roller Kelly Bushing
| Model | 20-HDP | MDS |
|---|---|---|
| Max Torque | 13729 N·m (10126 ft·lbf) | - |
| Drive Type | Square | Pin Shaft |
| Square Kelly Size | 63.5-133.35 mm (2 1/2-5 1/4 in) | - |
| Hexagonal Kelly Size | 76.2-107.95 mm (3-4 1/4 in) | - |
| Dimensions | 493×493×696 mm (19.4×19.4×27.4 in) | 510×510×720 mm (20×20×28.3 in) |
| Weight | 670 kg (1470 lb) | 420 kg (924 lb) |
3. Heavy Duty Roller Kelly Bushing
| Model | HDS | 27-HDP |
|---|---|---|
| Max Torque | 32365 N·m (23871 ft·lbf) | 22555 N·m (16636 ft·lbf) |
| Drive Type | Square | Pin Shaft |
| Square Kelly Size | 76.2-152.4 mm (3-6 in) | 63.5-133.35 mm (2 1/2-5 1/4 in) |
| Hexagonal Kelly Size | 76.2-152.4 mm (3-6 in) | 76.2-107.95 mm (3-4 1/4 in) |
| Dimensions | 630×630×740 mm (24.8×24.8×29.1 in) | 630×630×780 mm (24.8×24.8×30.7 in) |
| Weight | 700 kg (1540 lb) | 730 kg (1610 lb) |
Roller Kelly Features
Compatible with a wide range of Square and Hexagonal Kelly sizes.
Quad-roller precision design, four induction-hardened rollers reduce frictional resistance by up to 68% compared to solid bushings.
Available with various standard connection types to meet different rig configurations.
In a Middle Eastern rig operation, heavy duty pin drive bushings reduced torque fluctuations by 35%, resulting in a 50% increase in Kelly service life compared to standard bushing systems.
Frequently Asked Questions (FAQ)
What types of Roller Kelly Bushings are available?
There are three main types available: Light Duty, Medium-Duty, and Heavy Duty Roller Kelly Bushings, each engineered to meet specific torque and size requirements.
What is the maximum torque capacity of the Heavy Duty Roller Kelly Bushing?
The Heavy Duty Roller Kelly Bushing (Model HDS) is designed to handle a maximum torque of up to 32,365 N·m (23,871 ft·lbf).
How much do Roller Kelly Bushings reduce frictional resistance?
Thanks to a quad-roller precision design with four induction-hardened rollers, these bushings can reduce frictional resistance by up to 68% compared to traditional solid bushings.
Are these bushings compatible with both Square and Hexagonal Kellys?
Yes, the Roller Kelly Bushings offer high versatility and are fully compatible with a wide range of both Square and Hexagonal Kelly sizes.
Do the Roller Kelly Bushings meet industry standards?
Yes, they feature API-compliant connections and are available with various standard connection types to seamlessly integrate with different rig configurations.
What operational benefits have been observed in the field?
In a Middle Eastern rig operation, the heavy-duty pin drive bushings successfully reduced torque fluctuations by 35%, which led to a 50% increase in Kelly service life compared to standard systems.