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January 2010


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Tubo de Acero Aletado


High frequency, electrically welded fins increase the external surface of the tubes. A finned tube is equivalent to 4 to 8 bare tubes. Finning maximizes heat transfer, thus reducing the number of tubes required. This in turn results in a reduction in equipment costs to our customers.


Our finning involves the application of a high-frequency electric current through an electric circuit created between the tube and the fin fusing the two metals. No other welding element is involved. Our finning is accomplished at a controlled rate, achieving a clean and continuous joint between fin and tube.


Common applications for finned tubes include: boiler economizers, heat recovery steam generators, and the convection sections of process heaters and oil coolers.


Our finning techniques ensure a long life of the finned tube, redusing the amound of tube replacement necessary with other techniques.













    Finned tubes Applications:


  • Convection sections of process heaters.
  • Combined cycle boilers.
  • Economizers for boilers.
  • Heat exchangers.
  • Recovery boilers.
  • Oil coolers.
  • Plant reformer furnace.
  • A refinery produces high octane gasoline, where finned tube recovers heat from combustion gases.


    Why a finned tube?


  • Increases the outer surface of the tube.
  • Maximizes heat transfer by increasing the efficiency of the process.
  • Reduce the number of tubes used. (4 to 8 bare tubes per one finned tube).
  • Reduces the cost of equipment (1 finned tube cost is cheaper than 4 to 8 bare tubes cost).


Technical information

What is the welding of high strength?


Application of electricity through the contact of a tube and the fin to be welded, the resistance of this circuit produces the heat needed to make the welding joint. The use of pressure to shape the tube and fin together helps maximize the amount of heat needed to produce the union.


    Standard Frequency and High Frequency comparison


  • Standard Frequency at 60 Hz.
  • High frequency at 450.000 Hz.
    •   Best Union.
    •   Minimum heat affected zone.
    •   Ability to weld thicker fins.


    Tube materials types


        • Carbon steel ASTM A53, A106, A178, A192, and A210.
        • Alloy steel ASTM A 213 grades: T5, T9, T11, T22 and T91.
        • Alloy steel ASTM A 335 degrees: P1, P2, P5, P7, P9, P11, P12, P22 and P91.
        • Stainless steel ASTM A182 A312 Grade 304, 310, 321, 347.
        • High Chrome alloys such as Inconel and Incoloy.


    Fin materials


  • Carbon Steels A366.
  • Stainless steel type 304, 310.321, 409 and 410.
  • High Chrome alloys, Inconel and Incoloy.


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