Welded helical finned tubes are used in boilers, furnaces and fired heaters. A continuous helical fin is attached to the base by high frequency electric resistance welding in order to give an efficient bond. Fins can be either solid or serrated.

Tube and Pipe sizes available

Tube OD: 25.4 / 31.8 / 50.8 / 63.5 and 76.0mm

Pipe OD: 88.9 / 101.6 / 114.3 / 141.3 / 168.3 and 219.1mm

Tube/Pipe Thickness:

Minimum 2.13mm (solid fin), 1.9mm (serrated fin)

Minimum thickness is also dependant on the fin thickness and tube/pipe OD

Fin Height Range

Solid fin:6.3mm-31.8mm Serrated fin: 12.7mm - 38.1mm

Fin Height is dependant on the fin type (solid or serrated) tube OD, fin thickness and material.

Fin thickness is dependant on the fin material, height of the fin, and tube OD. Usually between 1.0mm and 3.4mm

Fin Density is dependant on the fin type (solid or serrated) tube OD, fin thickness and fin material. Density is generally between 1 fin/inch and 7 fins/inch. Materials for both tube/pipe and fin can be a combination of carbon steel, low alloy steel and stainless steel.