Finned tubes

Finned tubes enhance heat transfer efficiency by increasing surface area, making them ideal for use in heat exchangers and cooling systems.

Thermoregulation has played a vital role in nature and evolution for billions of years, from the cooling fins of the stegosaurus to the large, thin ears of modern elephants. Inspired by nature, our finned tubes are designed to efficiently reduce the total number of tubes needed in your applications.

The fins enhance heat removal from the inner tube surface through convection, significantly increasing heat transfer rates. This efficiency means fewer tubes are required, which in turn leads to smaller equipment sizes and lower costs. These combined savings can make a substantial — and profitable — impact on your bottom line.

We offer a variety of fin styles, each with unique specifications and operational benefits. Every style is durable, resistant to mechanical stress, and easily cleaned with water or steam, ensuring long-lasting performance and ease of maintenance.

OUR PRODUCTS

We offer the following range of finned tubes:

G fin

The “G” stands for “grooved,” referring to the method of attaching the fin to the tube. The fin strip is wound into a groove and securely locked in place by closing the groove with the base tube metal.

This design guarantees efficient heat transfer, even at high temperatures, with a maximum operating temperature of 450ºC.

L fin

The “L” stands for “L-footed,” referring to the shape of the fin and how it’s attached to the base tube. The strip material is precisely deformed under tension to create optimal contact pressure between the fin’s foot and the base tube.

This maximizes heat transfer efficiency and significantly enhances the corrosion protection of the base tube. Maximum operating temperature: 150ºC.

KL fin

A KL fin is a specialized type of finned tube. It combines the benefits of L fins and G fins for enhanced heat transfer and mechanical stability.

After the fin is applied, the fin foot is knurled into the matching knurling on the base tube, strengthening the bond between the fin and tube and improving heat transfer efficiency. Maximum operating temperature: 260ºC.

LL fin

The “LL” stands for “overlapped L-footed fin,” describing the method of attaching the fin to the base tube.
Similar to the L fin, but with the added feature of overlapping the fin foot to fully enclose the base tube, this design offers superior corrosion resistance.

LL fins are often used as a cost-effective alternative to more expensive extruded fins in corrosive environments. Maximum operating temperature: 180ºC.

Crimped fin

A crimped fin has a wavy, non-tapered shape that increases surface area and airflow turbulence, enhancing heat transfer efficiency.

The fin is wrapped under tension around the base tube, forming a crimp at the foot, and is then welded to the tube at the strip ends. Maximum operating temperature: 250ºC.

Extruded fin

Created by extrusion, an extruded fin offers a strong, integrated bond between the fin and the base tube. Formed from a bi-metallic tube, it typically has an aluminum outer layer and an inner tube of various materials.

The fin is rolled from the outer tube, providing excellent heat transfer properties, durability, and corrosion protection. These fins are ideal for demanding thermal applications, with a maximum operating temperature of 280ºC.

Integral low fin

In an integral low fin, the fins are directly formed from the base tube material, creating a low-profile design.

This fin type increases the tube’s external surface area, improving thermal performance without requiring changes to the heat exchanger’s shell size, flow arrangement, or piping.

Integral low fins are created through direct extrusion from the tube material.

The maximum operating temperature for integral low fin tubes typically ranges between 200°C to 300°C, depending on the material used.

Welded fin

In a welded fin, the fins are attached to the base tube through welding. High-frequency (HF) welded spiral finned tubes are among the most commonly used, made by helically winding the fin strip around the tube and welding it continuously.

This process maintains the tube’s metallurgical integrity while ensuring a strong fin-to-tube bond, ideal for efficient heat transfer and long life.

These tubes are especially suited for fouling applications and environments where high mechanical strength and resistance to deformation are required.