What are G Type Embedded Finned Tubes
G Type Fin Tubes, also known as G fin tubes, Grooved Fin Tubes or Embedded Fin Tubes, represent an advanced heat transfer technology widely used in industrial applications. These specialized G fin tubes feature fins that are mechanically embedded into grooves formed on the base tube surface through a precision manufacturing process. The “G” designation refers to the grooved construction method that distinguishes this fin type from other variants. These G fin tubes are particularly valued in applications requiring higher operating temperatures and relatively lower corrosive atmospheres. Their robust construction makes them suitable for demanding industrial environments where reliability and efficiency are paramount. The embedded design provides structural integrity that surpasses many other fin types, allowing them to maintain performance under thermal cycling and mechanical stress conditions.
The Key Features of G Type Embedded Finned Tubes
Embedded Fin Design:
- Fins are rolled or machined into grooves on the base tube, eliminating gaps between the fin and tube
- Prevents loosening under thermal stress or vibration
Structure of G Type Fin Tubes:
- Base tube: Typically a circular metal tube made of carbon steel, stainless steel, copper, or other alloys
- Fins: Metal strips (usually aluminum fins or steel fins) embedded into the grooves
The Working Principle of G Type Embedded Finned Tubes
The operational effectiveness of G Type Fin Tubes stems from several thermodynamic principles:
- Enhanced Surface Area: The fins dramatically increase the available surface area for heat exchange, typically by 5-10 times the bare tube area
- Optimized Thermal Contact: The embedded design minimizes thermal resistance at the fin-tube interface
- Improved Fluid Dynamics: The fin geometry promotes turbulent flow, breaking up boundary layers that inhibit heat transfer
- Structural Integrity: The mechanical bond resists thermal cycling stresses that could loosen attached fins
The Manufacturing Process of G Type Embedded Finned Tubes
Material Preparation
- Base Tube Selection: Carbon steel pipes, stainless steel pipes (304/316), or seamless steel pipes are selected for their mechanical strength and compatibility with high-frequency welding.
- Fin Strip Material: Aluminum strips (0.3–1.2 mm thickness) are precision-cut to match the base tube dimensions.
Groove Machining
- Precision Grooving: A CNC-controlled lathe or milling machine cuts helical or longitudinal grooves into the base tube surface. Groove depth typically ranges from 0.3–0.8mm, matching the fin strip thickness.
Fin Strip Embedding
- Mechanical Insertion: The fin strip is wound into the pre-machined grooves using automated winding equipment, ensuring uniform spacing (±0.15mm tolerance).
Mechanical Locking
- Pressure Rolling: Hydraulic rollers apply 10–15MPa pressure to compress the base tube material around the embedded fin, creating a mechanical interlock that eliminates gaps.
Quality Control
- Each G Type Fin Tubes undergo dimensional checks and often third-party inspections (SGS/BV).
The Advantages of G Type Embedded Finned Tubes
Robust Mechanical Bonding
- G fin tube’s cold-rolled grooves and pressure-locked fins eliminate welding, ensuring 100% metal-to-metal contact for superior durability.
High-Temperature Stability
- G fin tube operates reliably up to 450°C without thermal expansion mismatch, ideal for boilers and heat recovery systems.
Corrosion Resistance
- No welded seams reduce crevice corrosion risks; compatible with protective coatings (e.g., galvanizing) for harsh environments.
Low Maintenance
- G fin tube’s smooth, embedded fin design minimizes fouling and particulate accumulation, reducing cleaning frequency.
Vibration Resistance
- G fin tube’s mechanically interlocked fins withstand high vibration and thermal cycling without loosening.
Material Flexibility
- A G fin tube supports carbon steel, stainless steel, and copper-nickel base tubes for diverse industrial needs.
Cost Efficiency
- Energy-efficient manufacturing (no welding consumables) and extended service life lower lifecycle costs.
Compact & Lightweight
- High heat transfer density per unit length enables space-saving installations in constrained environments.
Flow Characteristics of G Type Embedded Finned Tubes
| Parameter | G Type Fin Tubes | H Type Fin Tubes | L Type Fin Tubes | Improvement |
| Heat Transfer Coefficient | High | Moderate | Low | Superior |
| Pressure Drop | Moderate | High | Low | Balanced |
| Fouling Resistance | Excellent | Good | Fair | Best |
| Mechanical Strength | 200-250 MPa | 80-120 MPa | 150-180 MPa | Highest |
| Temperature Limit | 300°C | 250°C | 400°C | Balanced |
The Disadvantages of G Type Embedded Finned Tubes
Base Tube Thickness Requirement
- G fin tube requires thicker base tubes (≥2mm) to withstand groove machining, limiting lightweight design flexibility.
Limited Material Pairings
- G fin tube is incompatible with soft alloys (e.g., pure copper) due to deformation risks during cold-rolling.
Higher Initial Cost
- Precision CNC grooving and mechanical locking processes demand specialized equipment, raising upfront investment.
Reduced Turbulence Efficiency
- Smooth embedded fins generate less turbulence compared to serrated or welded designs, lowering heat transfer in low-flow systems.
Fin Height Restrictions
- Maximum fin height capped at ~20mm to maintain mechanical interlock integrity, limiting surface area expansion.
Repair Difficulty
- Damaged fins cannot be individually replaced; entire tube sections often require refurbishment.
Sizes and Materials of Our G Type Embedded Finned Tubes
| Base Tube Diameter | 19 to 73 mm | 3/8″ to 2.1/2″ NPS |
| Base Tube Wall Thickness | 1.5 to 8 mm | 0.05″ to 0.32″ |
| Base Tube Length | ≤32,000 mm | ≤92 ft |
| Base Tube Material | Carbon Steel (A106B, P235GH, A179, A210, A192, etc.) Alloy Steel (P5, T5, P9, T9, T11, T22, etc.) Stainless Steel (TP304, TP316, TP347, B407 800H/HT, etc.) aluminum, copper, titanium | |
| Fin Pitch | 118 to 472 FPM | 3 to 12 FPI |
| Fin Height | 5 to 20 mm | 0.19″ to 0.79″ |
| Fin Thickness | 0.4 to 1 mm | 0.01″ to 0.04″ |
| Fin Material | aluminum fins, copper fins | |
| Fin Type | G | |
For other customized requirements for G Type Embedded Finned Tubes, please contact us.
What is the Price of G Type Embedded Finned Tubes
Please contact our sales manager Allen@sanesteel.com.
Our Production Capacity of G Type Embedded Finned Tubes
Total six G type embedded finned tubes machines, monthly production capacity is 180,000 meters in total.
G Type Embedded Finned Tubes Uses
- G Type Fin Tubes Air Coolers: The most common application, where they provide efficient heat dissipation from process fluids to ambient air
- G Type Fin Tubes Radiators: Used in industrial heating systems and power plant applications
- G Type Fin Tubes Heat Recovery Systems: Capturing waste heat from exhaust gases and process streams
- G Type Fin Tubes Greenhouse Heating: Providing uniform heat distribution in agricultural environments
- G Type Fin Tubes HVAC Systems: For large commercial and industrial heating/cooling applications
- G Type Fin Tubes Process Industry: Chemical plants, refineries, and petrochemical facilities
- G Type Fin Tubes Power Generation: Condensers, coolers, and heat recovery steam generators
Comparison with Other Finned Tubes
| Type | Bonding Method | Best For |
|---|---|---|
| G Type Fin Tubes | Mechanically embedded | High-pressure, high-corrosion |
| L Type Fin Tubes | Wrapped/welded fins | Moderate-temperature systems |
| Extruded Fin Tubes | Fins extruded from tube | Extreme thermal cycling |
Why Choose Us
- a 16-year G type embedded finned tubes manufacturer. We are experts.
- solutions for all your needs
- the highest product quality
- the low lead times
- excellent customer service
