Longitudinal finned tubes are used to give a great performance in any heat transfer application, especially in petrochemical area. They are the heart of heat exchangers that use their effective characteristics.

The finned tube are particularly efficient as the channels are welded on the external surface of the tube by means of resistance weld technique. Every channel is the result of a fin strip shaped into a U-form, such that each leg of the U will form a fin. The number of fins will be always a multiple of four with a maximum number depending on the outside diameter of the tube and on the thermodynamic calculations promoted for a specific job.

This resistance weld gives the channels a very high adhesion to the external surface of the tubes. This characteristic grants a great heat transfer efficiency, so that thermodynamic calculations can also design heat exchangers equipments at the best way .

We can also supply finned tubes with perforated fins ( e.g. for use with heaters B5 type ) as well as cut and twist configuration. U-Bend longitudinal finned tubes in single piece construction or with circumferential weld of bends are possible and belongs to the specialities we can offer.

For possible combinations of materials and dimensions you can find here some information about the most used configurations. We are always available to check new technical solutions on your request.

Technical Capabilities

Base Tube Sizes

16 mm to 273 mm (10”) and more on request

Tube/Pipe Material

Carbon Steel (A106, A333, A179, A210, P5, P11, P22, P9, etc.) + Stainless Steels (304, 316, 321 Duplex, Super Duplex, etc.) + Copper and Copper Alloys (Brass, Aluminum Brass, Copper Nickel 70/30 + 90/10) and Nickel Alloys (400, 600 and 800 series) – Materials can be supplied according to all standards like ASTM, ASME, EN, BS, DIN, etc.

Fin Material

Carbon Steel, 11Cr Steel, Stainless Steel, Copper and Copper Alloys like Brass and Copper Nickel, Nickel Alloys (400, 600 and 800 series), etc.

Fin Height

4,0 mm to 38,1 mm

Fin Thickness

0,8 mm to 1,5 mm

Number of Fins

Depending on the tube OD and your requirements


Longitudinal finned U-Tubes – single piece construction or with bends welded. Bending tolerances to TEMA or DIN/EN



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