Products Description
The YNJQ240 Fully Rotational Bucking Unit is a professional hydraulic bucking machine designed for precision make-up, break-out, and connection integrity verification of high-torque threaded connections in oilfield tubing, casing, downhole tools, drill tools, completion tools, and wellhead equipment. It supports pipe O.D. 60–230mm (2‑3/8" to 9") and delivers a maximum torque of 50-70 kN·m (36,878-51,629 ft·lb) at 20MPa. Equipped with Siemens S7‑1200 PLC and 15" industrial computer, it ensures accurate torque and turns monitoring, automatic operation, and stable performance. The power tong and backup tong each use three synchronized hydraulic cylinders for clamping, featuring 360° full rotation and API-compliant die marking. Optional non-marking dies are available for chrome and premium threads.
Equipment Parameters
| Specification | Value |
|---|---|
| Model | YNJQ-240 |
| Bore Diameter | Φ 240m (~Φ 9-3/8'') |
| Centre Height | 1150-1350mm (Customizable, available for larger or smaller sizes) |
| Application | O.D. 60-230mm (Φ 2-3/8'' to 9'') |
| Speed Range | Air-cooled hydraulic power, manual stepless speed control; Rotation speed: Low gear 1-7r/min, High gear 1-21r/min |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 36,878 ft.lb (50 kN.m) or 51,629 (70kN.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 | 30kW (Customizable), ABB Frequency converter control |
| Hydraulic System | Max. pressure: 20MPa; Flow rate: 40-180L/min |
| Dimensions | Main machine: 2.6m × 1.4m × 1.6m (Customizable, available for larger or smaller sizes) |
| Total Weight | Approx. 8-10T (Customizable) |
| 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 | 3 clamping cylinders for each power tong and backup tong |
Note: The conversion for 50 kN.m to ft.lb is approximately 36,878 ft.lb.
I. YNJQ240 Fully Rotational Bucking Unit Structures and Features
The YNJQ240/50 fully rotational bucking machine is a high-performance hydraulic bucking machine adopts a three-cylinder synchronized clamping system. The power tong utilizes three synchronized hydraulic cylinders for clamping and continuous rotation to grip the coupling, while the backup tong uses three synchronized cylinders to securely clamp the pipe body without rotation. Each cylinder drives an individual jaw, and the jaws are equipped with arc-shaped strip-type dies.
The backup tong allows slight floating to meet automatic centering requirements. The clamping force is controlled by the hydraulic system and is correlated with the applied rotational torque.
This bucking unit features a wide clamping range, high overall strength, reliable gripping without slippage or damage to the pipe body, and a high level of automation. The system supports automatic speed adjustment—high speed for make-up and low speed for torqueing—and complies with API standards.
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 YNJQ240 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 YNJQ240 Bucking Unit
1. Standard YNJQ240/50 Bucking Unit
2. Standard YNJQ240/70 Bucking Unit
3. YNJQ240/50 Bucking Unit Images
4. YNJQ240/70 Bucking Unit in Chongqing, China
5. YNJQ240/70 Bucking Unit in Sichuan, China
FAQ
Q1. What pipe sizes does the YNJQ240 fully rotational bucking unit fit?
A1. The YNJQ240 fully rotational bucking unit supports pipe O.D. 60–230mm (2‑3/8" to 9"), covering tubing, casing, downhole tools, drill tools, completion tools, and wellhead equipment commonly used in oilfield applications.
Q2. What is the maximum torque of this oilfield bucking machine?
A2. This oilfield bucking machine offers a maximum make-up and break-out torque of 50-70 kN·m (36,878-51,629 ft·lb) at 20MPa hydraulic pressure, with two torque options available (50 kN·m or 70 kN·m) to suit different high-torque threaded connection requirements.
Q3. Is the YNJQ240 API compliant?
A3. Yes, this API bucking unit fully meets API specifications. Die marking follows API standards, and optional non-marking dies are available to protect chrome and premium threads.
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 (high speed for make-up, low speed for torqueing).
Q5. What is included in the standard supply of YNJQ240?
A5. The standard package includes the main YNJQ240 bucking machine, hydraulic unit, control cabinet, dies, micro-dies, and complete documentation (QC certificate, warranty, manual, and drawings).
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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