Products Description
The YNJQ400 fully rotational bucking unit, also called torque machine, bucking machine, or hydraulic makeup and breakout unit, is designed for large-diameter oilfield casing, tubing, downhole tools, completion tools, drill tools, and wellhead equipment. It delivers a maximum torque of 150 kN.m (~110,634 ft.lb). Its power tong and backup tong each use 6 synchronized hydraulic cylinders for clamping, featuring 360° full rotation, PLC control, and optional non-marking dies. Optional features include eccentricity adjustment (0-200mm horizontal offset), push/pull function (15T-30T), and top-opening tailstock. Customized solutions are available.
Equipment Parameters
| Specification | Value |
|---|---|
| Model | YNJQ-400 |
| Bore Diameter | Φ 400mm |
| Centre Height | 1373mm (Customizable, available for larger or smaller sizes) |
| Application | 60mm - 380mm (2-3/8" to 14-1/2") |
| Speed Range | Air-cooled hydraulic power, manual stepless speed control; Rotating head speed: 0.5-5.5r/min (Optional for Max. 10.5r/min) |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 110,634 ft.lb (150 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), ABB Frequency converter control |
| Hydraulic System | Max. pressure: 20MPa; Flow rate: 40-220L/min |
| Dimensions | Main machine: 6m × 1.77m × 2.26m (Customizable, available for larger or smaller sizes) |
| Total Weight | Approx. 16T (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 | 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 100 kN.m to ft.lb is approximately 73,756 ft.lb.
I. YNJQ400 Fully Rotational Bucking Unit Structures and Features
The YNJQ400 hydraulic bucking machine (also called as hydraulic makeup and breakout unit) is a heavy-duty oilfield bucking equipment 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 bucking unit 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 YNJQ400 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 YNJQ400 Bucking Unit
1. YNJQ400 Bucking Unit Exported to Indonesia
2. Standard YNJQ400 Bucking Unit
3. YNJQ400/68 Bucking Machine Exported to Thailand
The YNJQ400/68 bucking machine supports two-speed modes: high and low. The high-speed mode reaches up to 21 r/min, while the low-speed mode reaches 7 r/min. The equipment operates with high efficiency, enabling rapid make-up and break-out operations. Its compact footprint, with dimensions of 1.2×1.6×3 meters, allows for effective space-saving. It supports jack-up packaging and can be fully operated within a 20FT container, making it well-suited for harsh outdoor environments.
4. YNJQ400 Bucking Unit with Push/Pull
FAQ
Q1. What is the YNJQ400 fully rotational bucking unit used for?
A1. It is designed for make-up, break-out, and connection integrity verification of high-torque threaded connections in large-diameter casing, tubing, downhole tools, drill tools, completion tools, wellhead equipment, and other oilfield components.
Q2. What clamping technology does this bucking unit use?
A2. 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.
Q3. What is the maximum torque of this machine?
A3. It provides a maximum make-up and break-out torque of 150 kN.m (~110,634 ft.lb) @ 20MPa pressure, suitable for large-diameter and high-strength threaded connections.
Q4. What control modes does it support?
A4. It supports manual operation and automatic control via Siemens S7-1200 PLC with a 15" all-in-one computer. The machine features automatic speed adjustment and stops automatically when reaching the set torque.
Q5. Do you support customized solutions?
A5. Yes. We provide personalized custom services including eccentricity adjustment, push/pull function, and top-opening tailstock. Contact us to get the latest quotation and technical parameters for specialized applications.
If you need professional pipeline hydrotesting equipment and oilfield bucking unit solutions, please contact us for detailed parameters and quotation.
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