Delfin Tubes

Manufacturing Process

L. P. S. p. A. Steel Fin Tubes are helically wound and continously welded to the tube by high frequency electric resistance welding of solid or serrated steel fins. This produces an homogeneous , clean and continous fin - to - tube bond with no additional weld material, for a very efficient heat flow and resistance to corrosion.

This manufacturing process is carried out under strict standards. We also produce finned tubes with intermediate plain portions where required.

The use of high-frequency current results in very localised heating of the tube surface and the edge of the fin. This skin effect produces higher weld speeds, hence post-weld heat treatment is not considered necessary because of the superficial nature of the changes in the microstructure.

Cold bending:

Of bare and finned tubes, single or multiple coil bends.

• Bending range: 3 / 4 '' (25 mm.) to 3 '' (88.9 mm.).
• Bending radius: max. 16 '' (406.4 mm.), min. 1 x D.

Protective Coating:

Where external corrosion of finned tube is expected, suitable protective coatings can be applied.