Products Description
The YNJG400 wedge roller bucking unit is a heavy-duty pneumatic hydraulic oilfield bucking machine, specially designed for precise makeup and breakout of oilfield tubing and casing, complying with API standards. It fits 114–365mm OCTG pipes with a maximum torque of 68 kN·m and dual-speed adjustment. Equipped with a Siemens PLC intelligent control system, it ensures accurate torque and turn control with real-time data recording. The 3-jaw closed clamping structure protects pipe threads and adapts to slightly bent pipes, making it ideal OCTG makeup breakout equipment for petroleum pipe production lines. Customized solutions are available.
Key Features & Specs
High Torque & API Compliance
Delivers up to 68kN·m (50,154ft·lb) maximum makeup torque at 20MPa, customizable for higher torque. Meets API standards with reliable clamping and die marking.
Advanced Clamping System
Closed 3-jaw power tong with 120° distribution, each jaw plate has 3-4 dies (9-12 contact points). Pneumatic backup tong reduces oil leakage and ensures stable operation.
High Production Efficiency
Under standard conditions (≤5-1/2" pipe, 3-4 threads remained), the production speed reaches 60-70 pieces per hour, ideal for tubing and casing 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-400 |
| Bore Diameter | Φ 400m (~Φ 15-3/4'') |
| Centre Height | 1100mm |
| Application | O.D. 114-365mm (Φ 5-1/2″、7″、8-5/8″、9-5/8″、10-3/4″ &13-3/8″, Optional for Φ 2-3/8'' to 13-3/8'') |
| Speed Range | Rotation speed: Low gear 1-7r/min, High gear 1-21r/min (Higher torque comes with lower rotational speed) |
| Make-up Torque | Max. make-up torque: 50,154 ft-lb (68kN.m) @ 20MPa pressure (Customizable, available for higher torque) |
| 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 | 30kW (Customizable), ABB Frequency converter control |
| Hydraulic System | Max. pressure: 20MPa; Flow rate: 40-220L/min |
| Dimensions | Main machine: 3m × 1.35m × 1.65m (Customizable, available for larger or smaller sizes) |
| Total Weight | Approx. 6.8T (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 ≤ 5-1/2'', 3-4 threads remained, 60-70 pieces/hour |
| Load Table (Optional) | Also called as auxiliary machine, handling system or transmission line to feed pipes |
Note: The conversion for 68 kN.m to ft.lb is approximately 50,154 ft.lb.
I. YNJG400 Wedge Roller Bucking Unit Structures and Features
Model YNJG400 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 5-1/2"-13-3/8" diameter casing and tubing , corresponded jaw plate listed as below table (i.e. List of Jaw Plates).
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 3 jaw plates with 120 º distributing, every jaw plate has 3-4 dies, totally 9-12 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 YNJG400 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
List of Jaw Plates
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 YNJG400 Bucking Unit
1. Standard YNJQ400/68 Bucking Unit
2. YNJG400/68 Bucking Machine to CNOOC, China
3. YNJG400/100 Bucking Machine Exported to India
4. YNJG400/68 Bucking Unit Exported to Kazakhstan
5. YNJG400/68 Bucking Unit to Sichuan, China
6. YNJG400/68 Bucking Unit with Loading Table
7. YNJG400 Specially Customized Bucking Unit with Side-mounted Hydraulic Motor
FAQ
Q1. What pipe sizes does the YNJG400 wedge roller bucking unit handle?
A1. The standard YNJG400 wedge roller bucking unit suits pipe O.D. 114–365mm (5‑1/2" to 13‑3/8"), covering common tubing and casing sizes. The diameter range can be expanded to 2-3/8"–13-3/8" by replacing dies and jaw plates.
Q2. What is the maximum torque of this tubing casing bucking machine?
A2. Under 20MPa hydraulic pressure, the YNJG400 delivers a maximum makeup torque of 68kN·m (50,154ft·lb), sufficient for heavy-duty tubing and casing operations. Higher torque is available upon request.
Q3. How efficient is the YNJG400 API makeup breakout unit?
A3. Under standard conditions with ≤5-1/2" pipe and 3-4 threads remained, the production speed reaches 60-70 pieces per hour.
Q4. What control system does this hydraulic bucking machine use?
A4. It adopts a Siemens S7-1200 PLC with a 15-inch industrial computer, enabling precise torque-turn control, automatic data recording, auto/manual operation, and auto stop at set values.
Q5. What are the advantages of the sealing and clamping system?
A5. Closed 3-jaw design with 9-12 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.
Hot Tags:
