Products Description
The YNJG720 Wedge Roller bucking unit, also called torque machine, bucking machine, or hydraulic makeup and breakout unit, is designed for large-diameter oilfield casing and tubing. It delivers a maximum torque of 100 kN.m (73,756 ft.lb), customizable for higher or lower torque. Its power tong uses a closed hydraulic clamping structure with 4 jaws at 90° intervals, and the backup tong is pneumatically driven, featuring dual-speed operation, PLC control, and optional non-marking dies. Customized solutions are available.
Key Features & Specs
High Torque & API Compliance
Delivers up to 100kN·m (73,756ft·lb) maximum makeup torque at 20MPa, customizable for higher or lower torque. Meets API standards with reliable clamping and die marking.
Advanced Clamping System
Closed 4-jaw power tong with 90° distribution, each jaw plate has 4-6 dies (16-24 contact points). Pneumatic backup tong reduces oil leakage and ensures stable operation.
High Production Efficiency
Under standard conditions (≤20" pipe, 3-4 threads remained), the production speed reaches 20-30 pieces per hour, ideal for large diameter mass production and repair lines.
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 | YNJG-720 |
| Bore Diameter | Φ 720m (~Φ 28-3/8'') |
| Centre Height | 1350mm |
| Application | O.D. 339-630mm (Φ 13-3/8'' to 22'') |
| Speed Range | Rotation speed: Low gear 1-7r/min, High gear 1-14r/min |
| Make-up/Break-out Torque | Max. make-up/break-out torque: 73,756ft-lb (100kN.m) @ 20MPa |
| Application Scenarios | Mainly used in production and repair lines for tubular products such as casing and tubing, etc. |
| 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: 40-180L/min |
| Dimensions | Main machine: 3.7m × 1.55m × 1.95m (Customizable, available for larger or smaller sizes) |
| Total Weight | Approx. 10T (Customizable) |
| Operation | Auto/Manual |
| Connections | API (Round & BTC) and Premium connections (TS3SB, VAM, BDS, SEC, AB, ANTARES, T Blue, etc.) |
| Steel Grade of Pipes | H40，J55，K55，N80，L80，C90，L95，P110，Q125 |
| Turns Measurement Resolution | 1/1000 |
| Torque Control Accuracy | Torque ≤ 3120N.m: ±5%; 3120N.m ≤ Torque ≤ 7800N.m: ±156N.m; Torque ≥ 7800N.m: ±2% |
| Air Pressure | 0.4-0.8MPa (Provided by user) |
| Production Speed | For pipe ≤ 20'', 3-4 threads remained, 20-30 pieces/hour |
| Load Table (Optional) | Also called as auxiliary machine, handling system or transmission line to feed pipes |
Note: The conversion for 100 kN.m to ft.lb is approximately 73,756 ft-lb.
I. YNJG720 Wedge Roller Bucking Unit Structures and Features
Model YNJG720 bucking machine is a special-purpose equipment used to make up and breakout the coupling and pipe (oil tubing, casing pipe, etc.).
The power tong assembly is responsible for initiating rotation and making up (or breaking out) the coupling, while the backup tong assembly is used to clamp the pipe body. The power tong is driven by a hydraulic motor, and the clamping and shifting of the backup tong are powered by pneumatic cylinders. The make-up/break-out torque is measured by a load sensor located at the lower end of the backup tong and is displayed on the computer at the operation console, with automatic control managed by the PLC system. This machine can finish the work of 13-3/8"-22" diameter casing and tubing, the jaw plates include 13-3/8", 16", 18-5/8'', 20", 22", other sizes need to be purchased separately.
The Structure Features
1) Driven and controlled by hydraulic and pneumatic system, and easy and convenient to operate.
2) Controlled by pneumatic, except for the power tong which driven by hydraulic motor, it can greatly reduce the oil leakage.
3) The power tong uses closed structure, it is driven by hydraulic motor, the clamp head has 4 jaw plates with 90º distributing, every jaw plate has 4-6 dies, totally 16-24 dies contacting the coupling surface, the die marks are according to API standard, the clamp head can reset automatically.
4) The power tong and backup tong can regulate their center in one line automatically to meet the requirements of using.
5) Backup tong is similar to the power tong, but it is driven by the pneumatic cylinder.
6) The backup tong is equipped with load sensor used to measure torque (unit:ft-lb or N.m). The control system will contrast the torque value and screw turns with the set value, control the working automatically.
7) Easy to change dies.
This design offers several key advantages: high and low gear rotating, efficient operation, simple controls, and stable performance. It allows for quick die replacement, with a design that ensures reliable clamping and API-compliant die marks. An automatic positioning mechanism enables fast and accurate tong head reset after bucking. Additionally, the power tong and backup tong can automatically center, accommodating slightly bent tubing, casing, and couplings.
Main Parts of YNJG720 Bucking Machine
1) Power Tong Assembly
2) Backup Tong Assembly
3) Electrical-hydraulic Control System
4) Control System (PLC + Upper Computer)
5) Frame Base
6) Pneumatic System
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 | 1 set | Material: 20CrMnTi |
| 5 | Jaw Plate | 1 set | According to technical agreement |
| 6 | Documents | 1 set | Includes QC certificate, warranty certificate, operation & maintenance manual, installation drawing, and e-drawing. |
III. Reference Images of YNJG720 Bucking Unit
1. Standard YNJQ720/100 Bucking Unit
2. YNJG720/100 Bucking Machine with Loading Table
FAQ
Q1. What pipe sizes does the YNJG720 wedge roller bucking unit handle?
A1. It supports pipe O.D. 339–630mm (13‑3/8" to 22"), with corresponding jaw plates for 13-3/8", 16", 18-5/8", 20", and 22".
Q2. What is the maximum torque of this large diameter casing bucking machine?
A2. It provides a maximum makeup torque of 100kN·m (73,756ft·lb) at 20MPa pressure, customizable for higher or lower torque to meet specific requirements.
Q3. How efficient is the YNJG720 API makeup breakout unit?
A3. Under standard conditions with ≤20" pipe and 3-4 threads remained, the production speed reaches 20-30 pieces per hour.
Q4. What control system does this hydraulic bucking machine use?
A4. It uses Siemens S7-1200 PLC with 15" industrial computer for auto/manual operation, torque-turn recording, and auto stop at set values.
Q5. What are the advantages of the sealing and clamping system?
A5. Closed 4-jaw design with 16-24 contact points ensures reliable clamping without thread damage. Pneumatic backup tong reduces oil leakage. Non-marking dies optional 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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