Embedded Fin Tube
G-type Finned Tubes
- Manufacturing Process: The fins are tightly embedded in the outer surface of the mechanically slotted base tube.
- Base Tube Material: Carbon steel, alloy steel, stainless steel, duplex steel, copper tube.
- Fins: Aluminum 1060, Aluminum 1100, T2 copper
- Applications: Air coolers, heat exchangers, air heaters, economizers
G-type Finned Tube Specifications
AGICO supplies a series of embedded G-type finned tubes for various heat exchangers in many industries. Here is the specification table of G-type finned tubes supplied by AGICO. Customers can customize the dimensions and materials of the base tube and fins. If you need a free quote, check the details and send your requirement now.
Fin Size and Details
| Item | Range |
|---|---|
| Base Tube OD | 19–63.5 mm |
| Tube Thickness | 1.5–6 mm |
| Tube Length | Up to 18 m |
| Fin Height | 8–16 mm |
| Fin Thickness | 0.3–0.5 mm |
| Fin Pitch | 2.1–5 mm |
| Fin Material | Aluminum, Copper |
| Base Tube Material | Carbon Steel, Stainless Steel, Alloy Steel |
| Maximum Service Temperature | 400°C |
What is an Embedded Finned Tube
Embedded finned tubes refer to a series of finned tubes for heat exchangers, including annular finned tubes, longitudinal finned tubes, helical serrated finned tubes, and the most frequently used G-type finned tube. According to the manufacture method, they can be classified into coiled finned tubes, welded finned tubes, cold-rolled finned tubes, and embedded finned tubes.
Embedded finned tubes provide excellent heat transfer efficiency, high fin retention strength, and reliable performance in air coolers, heat exchangers, economizers, and waste heat recovery systems.
Embedded Fin Tube & Welded Fin Tube
The difference between embedded and HFW welded fin tubes is mainly the bonding method of fin part. Embedded fin tube adopts helical groove for embedding metal fins; fins for welded finned tubes are welded onto the base tube.
Why Choose G-type Finned Tube from AGICO
- High Heat Transfer Performance: Comparable to KL-type finned tubes, it has increased external surface area, which is suitable for high-efficiency heat exchange applications.
- Strong Structural Stability: Grooved mechanical locking offers high fin rigidity; it is not easily deformed, has high fin retention and long-term stability.
- Excellent Corrosion Resistance: Aluminum and copper fin materials offer strong resistance to atmospheric corrosion on the outer surface of the tube, suitable for harsh environments.
- Wide Application Fields: With different matches of fins and base tube materials, it can be applied to air coolers, heat exchangers, marine boilers, power plant boilers, and other equipment requiring high corrosion resistance and heat transfer efficiency.
Quality Control
AGICO has quality control in each step of G-type finned tube manufacturing, such as raw material inspection, groove dimensional inspection, fin tightness inspection, hydrostatic test, eddy current test, etc.
G-type Finned Tube Manufacturing Process
The main elements of an embedded finned tube are the base tube and the fin metal strip. Base tube material options are carbon steel, stainless steel, alloy steel, duplex steel, copper, and titanium; common fin materials are metal strips of aluminum 1060/1100 and copper.
Embedded finned tubes are made by pre-machining helical grooves of a certain width and depth onto a steel pipe. This process is called groove formation and then fin insertion, which is embedding aluminum or copper strips as the fins. The last step is the fin-locking process; the metal strip is tightly bound within the spiral grooves, creating a certain contact area between the steel strip and base tube. Both ends of the steel fins are welded to the base tube to prevent the metal fins from falling off. Keep a certain side clearance between the steel strip and the spiral grooves for an easy embedding process. The completed finned tube shall have no cracks on the surface and undergo hydrostatic and dimensional inspection before packaging and delivery.
Structure of G-type Finned Tube
The G-type finned tube has an embedded bimetallic composite structure. The metal fins are tightly embedded in pre-machined spiral grooves on the outer surface of the base tube, forming a mechanical interlock.
- Base tube: Typically a circular metal tube, made of materials including carbon steel, alloy steel, stainless steel, or copper, serving as the pressure-bearing and heat-transferring component.
- Fins: Commonly made of aluminum (such as Al1060, Al1100) or copper (T2), spirally surrounding the base tube.
- Bonding interface: Spiral grooves of specific width and depth are machined into the outer surface of the base tube. The fin roots are embedded within these grooves, achieving a tight bond through the immense contact pressure generated by the interference fit. This reduces contact thermal resistance without the need for welding.
G-type Finned Tube Comparison with Other Models
| Type | L Type | LL Type | KL Type | G Type |
|---|---|---|---|---|
| Fin Attachment | Tension Wound | Overlapped | Knurled | Embedded |
| Temperature Limit | 150°C | 180°C | 250°C | 400°C |
| Fin Retention | Good | Better | Excellent | Excellent |
| Vibration Resistance | Moderate | Moderate | Good | Excellent |
FAQ of G-type Finned Tubes
Yes. Embedding fins to the surface of a plain metal tube helically creates a G-type finned tube.
The common sizes of G-type finned tubes are as follows: outer diameter is generally between Φ25mm and Φ55mm; length can range from 250mm to 12 meters. Fin spacing, fin thickness, and fin height can be customized according to requirements.
This is a key indicator of the strength of the bond between the fins and the base tube. A reference value is a pull-out force of not less than 80N.
They are widely used in industries such as petroleum, chemical, metallurgy, power, steel, natural gas processing, papermaking, and building heating. Specific equipment includes air coolers, air heaters, heat exchangers, air heaters, economizers, and boiler heat exchange systems.
When operating temperatures exceed 180°C, or when equipment faces severe mechanical loads (such as vibration or frequent start-stop cycles), G-type finned tubes are a more suitable choice due to their robust embedded structure and good temperature resistance.
G-type fin tube price is usually not fixed. If you need the real-time price, you can send your finned tube requirements, including factors such as base tube and fin material, specifications, and quality levels.
