Hydraulic Tubing Power Tongs API 7K For Well Service & Workover Operations

Hydraulic Tubing Power Tong – API 7K Hydraulic Power Tong for Well Service & Workover Operations

A hydraulic tubing power tong is a specialized hydraulic power tool designed for making up (tightening) and breaking out (loosening) threaded connections on tubing, sucker rods, small casing strings, and drill pipes during well service and workover operations. It is also commonly referred to as a hydraulic power tong, tubing tong, workover tong, or power tubular tong.

Unlike conventional manual tongs that rely entirely on human muscle power for every threaded connection operation, a hydraulic power tong harnesses pressurized hydraulic fluid — typically supplied from a workover rig‘s hydraulic system or a standalone hydraulic power unit (HPU) — to drive a powerful low-speed, high-torque hydraulic motor. This motor rotates the tong head, which is equipped with interchangeable jaw dies that grip the pipe body or coupling, while an integrated backup tong holds the lower section stationary to prevent the entire string from rotating.

The ability to generate high torque quickly and consistently makes hydraulic power tongs indispensable for modern oil and gas well servicing. Our XQ series hydraulic tubing power tongs adopt an inner cam rolling-up clamping mechanism (also known as an internal curved surface roller climbing mechanism) combined with a hydraulic backup tong, delivering reliable, high-efficiency performance across a wide range of tubular sizes.

Hydraulic Tubing Power Tongs vs. Manual Tongs – Key Advantages

Understanding why hydraulic power tongs have largely replaced manual tongs in professional well service operations is essential.

The data supports these advantages. Industry documentation confirms that power tubing tongs deliver significantly faster pipe tightening and loosening compared to manual tongs, with reported efficiency improvements of approximately 30% or more in commercial operations. This translates directly into reduced non-productive time (NPT) on every workover job.

How a Hydraulic Tubing Power Tong Works – Operating Principles

The XQ series hydraulic tubing power tong is an open-throat, fully reversible power tong with four forward and four reverse gear speeds, allowing the operator to select the optimum torque and speed combination for each specific make-up or break-out operation.

Basic Workflow – Step by Step

Position the tong – The open throat design allows the main tong to be slid onto the pipe string at the coupling level without needing to pass over the entire pipe. This feature is particularly valuable on crowded rig floors or when handling long tubular strings.

Close the safety door – The main tong is equipped with an automatic safety door that closes around the pipe. This door performs two critical functions: it retains the jaw dies and pipe securely during rotation, and it protects the operator from rotating components.

Hydraulic power is engaged – The operator actuates a manual reversing valve on the main tong control console. Pressurised hydraulic fluid flows from the rig‘s hydraulic system (or a dedicated power unit) to the low-speed, high-torque hydraulic motor mounted on the tong body.

The main tong rotates – The hydraulic motor drives the tong head via a multi-stage planetary or spur gear transmission. The XQ series features a four-gear shifting mechanism, giving the operator a choice of torque/speed combinations. Lower gears deliver higher torque for final tightening or loosening of seized connections; higher gears provide faster rotation for spinning operations.

The backup tong holds the lower section – Simultaneously with main tong rotation, the hydraulic backup tong clamps the tubing or tool joint below the connection. The backup tong remains stationary, preventing the entire pipe string from rotating with the main tong. Both main and backup tongs operate synchronously under the control of a single manual reversing valve.

The clamping mechanism engages – The inner cam rolling-up clamping mechanism uses multiple jaw dies mounted on curved roller assemblies. As the tong head rotates, centrifugal force or mechanical action causes the rollers to climb the internal curved surface (the cam), forcing the jaw dies inward to grip the pipe body with increasing pressure. This self-energizing action means the harder the torque load, the tighter the grip.

Make-up or break-out is completed – The operator watches the tong rotation until the connection reaches the correct number of turns or the torque control system (if equipped) signals completion. On make-up, the torque builds to the preset value; on break-out, the initial resistance is overcome and the connection separates.

The safety door opens – Once the rotation stops, the operator opens the automatic safety door, the jaw dies retract (spring-loaded return), and the tong can be lifted off the pipe.

This fully synchronized operation of main tong and backup tong, controlled by a single reversing valve, dramatically reduces the number of separate steps required compared to manual tong operations. The operator never needs to touch a rotating component, and the risk of dropped objects or crushed fingers is largely eliminated.

Key Features – Technical Excellence in Every Detail

1. Inner Cam Rolling-Up Clamping Mechanism

The most distinctive feature of our XQ series power tongs is the inner cam rolling-up clamping mechanism (also called the internal curved surface roller climbing mechanism). Unlike older designs that rely on screw-down vises or external cam rings, this mechanism integrates the cam surfaces inside the tong head.

How it works: The tong head contains multiple jaw die holders mounted on rollers. As the tong head rotates, the rollers travel along precision-machined internal curved ramps. The geometry of these ramps forces the jaw dies to move radially inward, progressively tightening their grip on the pipe. The torque transmitted from the hydraulic motor to the pipe increases as the gripping pressure increases — a self-energizing system that provides exceptional holding power without requiring operator adjustment.

Benefits:

No part replacement required within the full application range of each model

The same jaw dies can handle multiple pipe sizes

Clamping force automatically adapts to applied torque

Simple, rugged construction with minimal wearing parts

2. Synchronized Main and Backup Tongs

Both the master tong (upper) and backup tong (lower) adopt the same two-way internal curved surface roller climbing mechanism. The backup tong clamps the tubing or tool joint below the connection, holding it stationary while the main tong rotates. Operation of both tongs is synchronized through a single manual reversing valve.

This synchronized control provides three critical advantages:

Consistent gripping: Both tongs clamp and release in unison, eliminating timing errors that could damage threads

Operator simplicity: One valve controls both functions, reducing training requirements and operational errors

Enhanced safety: The backup tong is automatically engaged whenever the main tong rotates

3. Four-Gear Shiftable Transmission

The main tong is equipped with a four-gear shifting mechanism (four forward speeds, four reverse speeds). This feature allows the operator to select the optimum torque/speed combination for each specific job.

Typical applications by gear selection:

High gear, low torque: Spinning long strings of tubing into the well (fast make-up before final tightening)

Low gear, high torque: Final torquing of premium connections or breaking out seized threads

Intermediate gears: General make-up and break-out operations on standard API connections

By adjusting the system pressure and flow appropriately, the operator can achieve a wide range of torque and speed values suitable for different tubular sizes and connection types.

4. High-Efficiency Hydraulic Drive System

The master tong is powered by a low-speed, high-torque hydraulic motor, which provides excellent starting torque and smooth rotation even at very low speeds. The hydraulic circuit is controlled by a manual reversing valve that includes an integral over-pressure safety protection function.

Hydraulic specifications:

Rated pressure: 10–17.5 MPa (1,450–2,500 psi) depending on model

Oil supply flow rate: 80–140 L/min (21–38 gpm) depending on model

Both high-speed (spinning) and low-speed (torquing) ranges available

5. Automatic Torque Control System (Optional)

For applications requiring precise, repeatable make-up torque — particularly when running premium threads such as VAM, FOX, or other proprietary connections — the power tong can be equipped with an automatic torque control system.

How it works: Sensors measure the hydraulic pressure in the motor circuit, which is directly proportional to the torque applied to the pipe. The operator presets a target torque value on the control panel. When the sensor detects that this value has been reached, the system automatically stops rotation and signals completion. Torque values can be displayed, recorded, stored, and printed for quality assurance and regulatory compliance.

Benefits:

Eliminates guesswork and operator variability

Protects expensive premium threads from over-torquing

Provides verifiable records of each connection‘s make-up torque

Reduces connection failures and leak paths

6. Automatic Safety Door with Positive Interlock

The main tong is equipped with an automatic opening and closing safety door that positively locks when closed. The door serves multiple safety functions:

Retains the jaw dies and pipe within the tong head during rotation

Precludes operator contact with rotating components

Provides an interlock that prevents rotation unless the door is fully closed

7. Reliable Braking System

The tong employs a braking belt mechanism that provides positive, reliable stopping power when rotation is disengaged. The brake automatically engages when the manual valve is returned to neutral, preventing freewheeling of the tong head.

8. Long Guide Pole Assembly (Optional)

For applications where the backup tong needs to grip the tubing body rather than the coupling (such as when the coupling is damaged or when working with non-upset tubing), an extra-long guide rod assembly can be fitted. This extends the distance between main and backup tongs, allowing the backup tong to clamp the pipe body below the connection.

9. Automatic Spring Hanger or Hydraulic Spring Hanger

The power tong can be suspended from a spring hanger or a hydraulic spring hanger. The hydraulic system — equipped with slow up/down control — allows the operator to adjust the height of the power tong during singlelift sub operations, making it easier to align the tong with connections at varying heights above the rig floor.

API 7K Compliance – Quality Assurance You Can Trust

All XQ series hydraulic tubing power tongs are designed, manufactured, and tested in accordance with API Spec 7K (Specification for Drilling and Well Servicing Equipment). API Spec 7K is the international standard that establishes design, manufacturing, testing, rating, and documentation requirements for drilling and well-servicing equipment, including power tongs.

In addition to API 7K, our power tongs comply with Chinese Petroleum Industry Standards SY/T 5074 (Power Tongs for Petroleum Drilling and Workover). The combination of API and SY/T compliance ensures that our products meet both international and local market requirements.

Technical Specifications – Complete XQ Series Models

The XQ series hydraulic tubing power tongs are available in six models, ranging from the compact XQ89/3YC (ideal for shallow workover operations) to the heavy-duty XQ194/40 (suitable for deeper wells and larger casing strings).

Hydraulic Tubing Power Tong Applications

Hydraulic tubing power tongs are essential equipment for a wide range of oilfield operations:

Workover Operations

Pulling and running tubing strings during well workover

Replacing damaged tubing sections

Installing or removing subsurface pumps

Running and retrieving sucker rod strings

Completion Operations

Running production tubing during well completion

Torquing premium connections to specification

Installing downhole completion equipment

Drilling Operations (Small Hole)

Making up and breaking out small drill pipe connections

Running and pulling bottom hole assemblies (BHAs)

Well Servicing

Routine well maintenance requiring tubular handling

Fishing operations requiring controlled breakout torque

Well abandonment requiring retrieval of tubular strings

Onshore and Offshore Applications

Our power tongs are suitable for use in both onshore and offshore oilfields. The compact, robust design performs reliably in the confined spaces typical of offshore rig floors, as well as in the harsh environmental conditions of remote onshore locations.

Operational Guidelines – Safe and Efficient Use

Before Operation

Verify that the tong size range matches the tubular OD to be handled

Install the correct jaw dies for the pipe size (jaw seats are interchangeable)

Check hydraulic hoses and fittings for leaks, wear, or damage

Ensure the safety door operates freely and latches securely

Confirm that the braking belt is properly adjusted

Verify hydraulic power unit pressure and flow are within specifications for the model

During Operation

Position the tong so that the pipe is centred in the open throat

Close the safety door — rotation will not occur until the door is fully closed

Actuate the manual reversing valve to begin rotation

For make-up: Use high speed for spinning, then shift to low speed for final torquing

For break-out: Use low speed to overcome initial resistance, then high speed to spin off

Monitor the operation — if the tong stalls, reduce torque or check for cross-threading

When operation is complete, return valve to neutral; the brake will engage automatically

After Operation

Open the safety door and lift the tong clear of the pipe

Inspect jaw dies for wear — replace if worn below specification

Clean mud and debris from the tong mechanism

Lubricate pivot points and bearing surfaces as per maintenance schedule

Inspect hydraulic hoses for chafing or damage

Critical Safety Rules

Never position any part of the body inside the open throat

Never reach into the tong while the hydraulic system is pressurized

Always use the safety door — never operate with the door removed or bypassed

Never exceed the rated maximum torque of the tong

Ensure all personnel stand clear of the tong during rotation

Why Choose Sunrise for Hydraulic Tubing Power Tongs

As a specialized trading company with strong API-certified manufacturing partnerships, Sunrise offers:

API Spec 7K certified power tongs – Full compliance with the latest edition of API Spec 7K

Complete XQ series range – Six models from 3,300 N·m to 40,000 N·m maximum torque

Wide pipe size coverage – From 42 mm (1.65’’) up to 215.9 mm (8.5’’) OD

Advanced clamping mechanism – Inner cam rolling-up design with common dies across size ranges

Optional torque control system – Preset torque values with automatic stop, display, and recording capability

Optional long guide pole – Backup tong grips tubing body when needed

Comprehensive documentation – Hydraulic schematics, parts lists, operating manuals, and API compliance certification

Global logistics support – Export documentation, sea/air freight, and delivery to remote drilling locations worldwide

Contact Sunrise to order the right hydraulic tubing power tong for your workover or well service operation. We provide the correct torque rating, size range, and optional features for your specific tubular handling requirements — with full API 7K compliance, documented quality, and on-time delivery.