HF Fintube & Studded Tube

Finned Tube

Fin tubes are used wherever electric power is generated or raw materials are refined and where efficient cooling is required. Fin tubes are needed in a constantly increasing quantity for the production of heat exchangers, condensers, coolers and furnaces. The great increase of the thermal efficiency when applying fin tubes allows a substantial reduction in site and costs of such cooling equipment. The surface of such tubes is substantially increased and consequently less tubes are required compared with exchangers with plain tubes.

‘G’ Fin
(Embedded Fin) 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. Maximum operating temperature for this fin type is 450°C.

Fin material : Aluminium or copper
Tube materials : Carbon steel, Cr.-Mo. steel, stainless steel, copper, copper alloys, etc.

‘LL’ Fin
Manufactured in the same way as the ‘L’ fin type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of tube is often used as an alternative to the more expensive extruded type fin in corrosive environments. Maximum operating temperature for this fin type is 180°C.

Fin material : Aluminium or copper.
Tube materials : No theoretical limits.

‘L’ Fin
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. Maximum operating temperature for this fin type is 150°C.

Fin material : Aluminium or copper.
Tube materials : No theoretical limits.

‘DL’ Fin
This fin type is a non taper fin wrapped under tension around the base tube. The finning process results in a crimp forming at the foot of the fin. Fin is then welded to the base tube at the strip ends. Maximum operating temperature for this fin type is 250°C.

Fin material : Carbon/stainless steel or copper.
Tube materials : Carbon/stainless steel or copper and copper alloys.

‘KL’ Fin
Manufactured exactly as the ‘L’ fin 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. Maximum operating temperature for this fin type is 260°C.

Fin material : Aluminium or copper.
Tube materials : No theoretical limits.

Extruded High Fin
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. Maximum operating temperature for this fin type is 280°C.

Fin material : Aluminium.
Tube materials : No theoretical limits.

Other types of Finned Tubes: Square fins, Oval Fins, Extruded serrated finned tubes, Serrated Fins, Longitudinal Channel Fin, etc.


High Frequency Welded Finned Tube

Uses of welded finned tubes
The main uses for high frequency welded finned tubes are in the heat recovery associated with boilers for power generation and in furnace applications for the various processing industry.

Manufacturing Process
GME supplies the highest quality welded finned tubing to any part of the world for use in oil refineries, petrochemical plants, power generating stations, fertilizer and gas production plants. The newly designed manufacturing facility, with our high frequency resistance welding machines, enables us to perform large scale projects in reduced times.

The steel fin (solid or serrated) is helically wound and continuously welded to the tube by high frequency electric resistance welding. This produces a homogeneous, clean and continuous fin-to tube bond with no additional weld material, for a very efficient heat flow and resistance to corrosion.

The welding process enables the combination of any grades for studs and tube: carbon, alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.

Sizes and materials
Our high frequency welding finning machines are capable of handling tube diameters from 21 mm o/d to 273 mm o/d and tube lengths of up to 26 meters. Fin sizes range from 6 mm to 38 mm high and from 0.8 mm to 3 mm thick.

Tube O.D: 3/4″ to 10″
Tube Thickness: upon request
Tube Length: upon request
Tube material: Carbon steel / Alloy steel / Stainless steel / nickel / high nickel alloy / nickel copper / nickel – chrome – iron / copper alloy /etc.
FIN Height: 6mm to 38mm
FIN Thickness: 0.8mm to 3mm
FIN Pitch: 3mm to 25mm or 1 to 7 fins/inch
FIN Type: Plain/solid or serrated
FIN Material: Carbon steel / stainless steel / high nickel alloy / etc.

 

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Studded Tube

Uses of Studded Tubes
Steel studded tubes are used instead of finned tubes for heat transfer in the processing industries, generally in furnaces, gas turbines, fired heaters and furnace applictions where the surface is exposed to a very corrosive environment and where very dirty gas streams require frequent or aggressive cleaning

Welding Process
The steel studs are automatically resistance welded to the tube, producing high quality forge welds. Our automatic studding machines are capable of handling tube diameters from 1″ TO 8″ o/d and standard stud diameter of 12.7mm.

The welding process enables the combination of any grades for studs and tube: carbon, alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.

Tube O.D. : 1″ to 8″
Tube Thickness: On request, depend on fin thickness and tube O.D.
Tube Length: Upon request
Tube material: Carbon steel / Alloy / Stainless Steel / Nickel / High nickel alloy / Nickel copper / nickel – chrome – iron / copper alloy
STUD height: 25mm to 38mm
STUD diameter: 12,7mm to 18mm
STUD Pitch: 16mm (5/8″) = 63 studs rows per meter
STUD Type: Cylindrical, Elliptical, or Lens type
STUD material: carbon steel / stainless steel / alloy steel or others

 

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