Lifeng offers a wide range of extended heating surface tubes including Helical Finned Tubes in both Solid and Serrated fin profiles, Plate Fins and Cast Iron Fins. Finned Tubes are used in Power Generation Plants Heat Recovery Steam Generators, Petro-Chemical Industires, Boiler Plants, Economisers, Gas Coolers and other Heat Exchangers in a wide range of applications.
For Tube and Fin materials, sizes technical information, please contact our sales office.
Bimetallic Finned Tubes
Extruded Finned Tube - This fin type is formed from a bi-metallic tube consisting of an aluminium outer tube and an inner tube of almost any material. The fin is formed by rolling material from the outside of the exterior tube to give an integral fin with excellent heat transfer properties and longevity. Extruded fin offers excellent corrosion protection of the base tube.
'G' Embedded Finned Tube - The fin strip is wound into a machined groove and securely locked into place by back filling with base tube material. This ensures that maximum heat transfer is maintained at high tube metal temperatures.
'L' Finned Tube – The strip material is subjected to controlled deformation under tension giving the optimum contact pressure of the foot of the fin onto the base tube thus maximising the heat transfer properties. The foot of the fin considerably enhances the corrosion protection of the base tube.
'LL' Finned Tube – Manufactured in the same way as the 'L' finned tube type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.
'KL' Finned Tube – Manufactured exactly as the 'L' finned tube except that the base tube is knurled before application of the fin foot. After application, the fin foot is knurled into the corresponding knurling on the base tube thereby enhancing the bond between the fin and tube, resulting in improved heat transfer characteristics.
Monometallic Finned Tubes
Type–Low Fin Tube, Turbo-B Tube, Turbo-C Tube, Turbo-E Tube, Corrugated Tube.
Monometallic finned tube with fins drawn from the parent metal of the tube. All monometallic Tubes are using a cold rolling or ribbing process.
High-frequency Welded Helical Finned Tubes
A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond. Fins can be either solid or serrated (segmented). This type finned tubes are used in boilers, furnaces and fired heaters.
Tube and Pipe sizes available:
Tube OD: 25.4 / 31.8 / 38.1 / 50.8 / 63.5 and 76.0 mm
Pipe OD: 26.7 / 33.4 / 42.2 / 48.3 / 60.3 / 73.0 / 88.9 / 101.6 / 114.3 / 141.3 / 168.3 and 219.1 mm
Tube/Pipe Wall Thickness:
Minimum 2.13mm for solid fin
Minimum 1.9mm for serrated fin
Minimum thickness is also dependant on the fin thickness and tube/pipe OD.
Fin HeightRange:
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 fin and tube OD. Usually between 1.0mm and 3.4mm.
Fin Density is dependant upon fin type (solid or serrated) tube OD, fin height, 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.
