Products Description
The YNJQ590 Fully Rotational Bucking Unit is a heavy-duty hydraulic bucking machine for large-diameter casing, tubing, downhole tools, and wellhead equipment. It supports pipe O.D. 60–460mm (2‑3/8" to 18") with a max torque of 205 kN.m (~150,000 ft·lb) at 20MPa. Equipped with Siemens PLC and 15" industrial computer, it ensures precise torque and turn control. The power tong and backup tong each use 6 synchronized hydraulic cylinders for 360° full rotation. Optional features include eccentricity adjustment (0-200mm), push/pull (15T-30T), and top-opening tailstock. Custom solutions available.
Key Features & Specs
Ultra-High Torque & API Compliance
Delivers up to 205 kN.m (~150,000 ft·lb) maximum makeup torque at 20MPa, suitable for ultra-large diameter and high-strength threaded connections. Meets API standards with reliable clamping and die marking.
6+6 Cylinder Heavy-Duty Clamping System
Power tong and backup tong each use 6 synchronized hydraulic cylinders (Italian-made synchronizer) for clamping. The power tong clamps the coupling and rotates continuously, while the backup tong clamps the pipe body without rotation.
360° Full Rotation & Optional Upgrades
Features 360° full rotation with automatic speed adjustment via frequency converter. Optional upgrades include eccentricity adjustment (0-200mm horizontal offset), push/pull function (15T-30T), and top-opening tailstock for extra-long or heavy-load workpieces.
Intelligent Control & Data Traceability
Configured with Siemens S7-1200 PLC and 15" industrial computer, supporting auto/manual operation. All torque and turn data are automatically recorded for complete traceability.
Equipment Parameters
| Specification | Value |
|---|---|
| Model | YNJQ-590 |
| Bore Diameter | Φ 590mm (~23-1/4'') |
| Centre Height | 1573mm (Customizable, available for larger or smaller sizes) |
| Application | 60mm - 460mm (2-3/8" to 18") |
| Speed Range | Air-cooled hydraulic power, manual stepless speed control; Rotating head speed: 0.5-5.5r/min (Optional for Max. 7.5r/min) |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 150,000 ft.lb (205 kN.m) @ 20MPa pressure |
| Application Scenarios | Make-up, break-out or verify connection integrity of high-torque threaded connections in tubulars (oil tubings, casing pipes, etc.), downhole tools/bottomhole assemblies including drilling tools and accessories (drill pipe, drill collar, drill bit, stabilizer, dowhole motors, etc.), completion tools and accessories (nipples, packer, tubing hanger, etc.), wellhead, fittings, and more. |
| Torque Display | The computer can display, record and control the torque and turns |
| Control Mode | Simens S7-1200 PLC + 15" all-in-one computer, operation with buttons; The machine will stop automatically reaching the setting torque |
| Torque Accuracy | 150 ft.lb |
| Dies Marking | According to API standards, no damage to pipe accuracy; Optional no-marking dies (Fe-free for special materials like chrome, and no marking on pipe surface) |
| Motor Power | 37kW (Customizable, higher speed requires more powerful motor), ABB Frequency converter control |
| Hydraulic System | Max. pressure: 20MPa; Flow rate: 50-240L/min |
| Dimensions | Main machine: 6m × 2.5m × 2.7m (Customizable, available for larger or smaller sizes) |
| Total Weight | Approx. 21T |
| Power Tong | 360° full rotation |
| Connections | API (Round & BTC) and Premium connections (TS3SB, VAM, BDS, SEC, AB, ANTARES, T Blue, etc.) |
| Turns Accuracy | Resolution: 1/1000 |
| Torque Control Accuracy | Torque ≤ 3120N.m: ±5%; 3120N.m ≤ Torque ≤ 7800N.m: ±156N.m; Torque ≥ 7800N.m: ±2% |
| Qty. of Cylinders | 6 clamping cylinders for each power tong and backup tong |
| Eccentricity Range (Optional) | 0-200mm (Horizontal Offset) |
| Push/Pull (Optional) | Max. force: 15T-30T |
| Top-opening Tailstock (Optional) | Optional for supporting extra-long, heavy-load or large-diameter workpieces |
Note: The conversion for 205 kN.m to ft.lb is approximately 151,200 ft.lb.
I. YNJQ590 Fully Rotational Bucking Unit Structures and Features
The YNJQ590 hydraulic bucking machine (also called as hydraulic makeup and breakout unit) is equipped with 6 hydraulic cylinders. During operation, the pipe remains fixed while the 6 cylinders work in sync to clamp the coupling and rotate continuously. Each cylinder controls one jaw, and the reliable synchronizer is imported from Italy. The backup tong can float slightly to automatically adjust its center. The clamping force is controlled by the hydraulic system.
This design offers several key advantages: broad application range, high mechanical strength, reliable clamping with no slippage, minimal pipe damage, small die marking in accordance with API standards, and high automation. Additionally, the machine features automatic speed regulation via a frequency converter, making it suitable for premium connections.
Main Parts of YNJQ590 Fully Rotational Bucking Machine:
1) Power Tong Assembly
2) Backup Tong Assembly
3) Electrical-hydraulic Control System
4) Control System (PLC + Upper Computer)
Key Parts Images
Control Cabinet and Torque-turn Curve of Bucking Unit
Non-marks Dies
II. Scope of Supply
| No. | Name | Qty. (set/pcs) | Remarks |
|---|---|---|---|
| 1 | Bucking machine | 1 set | Includes power tong assembly, backup tong assembly, basement, and two moving supports. |
| 2 | Hydraulic unit | 1 set | Includes hydraulic pump, valves, integrated package, oil tank, motor, fan cooler, and pipeline. |
| 3 | Control cabinet | 1 set | Includes control panel, computer, and control box. |
| 4 | Dies | 10 pcs | — |
| 5 | Micro-dies | 10 pcs | — |
| 6 | Documents | 1 set | Includes QC certificate, warranty certificate, operation & maintenance manual, installation drawing, and e-drawing. |
III. Reference Images of YNJQ590 Bucking Unit
1. Standard YNJQ590 Bucking Unit
2. YNJQ590 Bucking Unit Exported to Russia
3. YNJQ590 Bucking Unit with Top-opening Tailstock Exported to Thailand
The backup tong (Tailstock) adopts an top-opening structure for clamping the pipe body. The opening mechanism is driven by a hydraulic cylinder, allowing the top jaw to lift and open, which facilitates quick hoisting of the workpiece at the open position. The backup tong is mounted on a sliding trolley and can move along with the threads during make-up and break-out operations. And it is also equipped with a lock mechanism, which secures the top-opening structure when the opening function is not in use, effectively providing safety protection. And this machine is able to use power tong (headstock rotating wellhead) to makeup/breakout wellhead (weight ≥ 1.5T) and casing pipe.
4. YNJQ590 Bucking Unit Exported to CNOOC Indonesia
5. YNJQ590 Bucking Unit Exported to Middle East
6. YNJQ590 Bucking Unit Exported to Yemen
7. YNJQ590 Bucking Unit Exported to Oman
8. YNJQ590 Bucking Unit Exported to Algeria
FAQ
Q1. What pipe sizes does the YNJQ590 fully rotational bucking unit handle?
A1. The YNJQ590 fully rotational bucking unit supports pipe O.D. 60–460mm (2‑3/8" to 18"), covering large-diameter casing, tubing, downhole tools, drill tools, completion tools, and wellhead equipment commonly used in heavy-duty oilfield applications.
Q2. What is the maximum torque of this heavy-duty oilfield bucking machine?
A2. This heavy-duty oilfield bucking machine offers a maximum make-up and break-out torque of 205 kN.m (~150,000 ft·lb) at 20MPa hydraulic pressure, suitable for ultra-large diameter and high-strength threaded connections.
Q3. What clamping technology does this API makeup breakout unit use?
A3. This bucking unit uses 6 synchronized hydraulic cylinders for both power tong and backup tong. Each cylinder controls one jaw with an Italian-made synchronizer for reliable performance. The backup tong can float slightly to automatically adjust its center.
Q4. What control system does this hydraulic bucking machine use?
A4. It adopts Siemens S7-1200 PLC with a 15" industrial computer for auto/manual operation, real-time torque-turn recording, and automatic stop at preset torque values. The machine features automatic speed adjustment via frequency converter.
Q5. What optional features are available for the YNJQ590?
A5. Optional features include eccentricity adjustment (0-200mm horizontal offset), push/pull function (15T-30T), top-opening tailstock for extra-long or heavy-load workpieces, and non-marking dies for chrome and premium threads.
Boyu Petroleum Equipment owns over 30 years of professional experience in R&D and manufacturing of hydraulic bucking units, steel pipe hydrostatic testing machines, and pipe straightening machines.
If you need professional pipeline hydrotesting equipment and oilfield bucking unit solutions, please contact us for detailed parameters and quotation.
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