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Finned Tubes
GEA Aircooled Systems manufactures various types of
aluminium, copper, stainless steel and galvanised carbon steel finned
tubes, according to customer specifications in terms
of working temperature, ambient temperatures, corrosive atmospheres, etc.
Application: High-efficiency fins for various temperature applications, giving the
base tube complete and permanent protection against atmospheric corrosion. The extruded fin is very
robust and resistant to mechanical damage, allowing the fins to be easily cleaned with steam or
water.
Maximum Operating Temperature: 300°C
Manufacture: A carefully degreased core tube is fitted into an aluminium sleeve.
This assembly is then fed into the triple-spindle finning head of the fin-extruding machine. Three
special multidisc packs extrude the aluminium tube into helical high fins, reducing the inner
diameter of the sleeve to give firm pressure contact with the base tube.
Fin Material: Aluminium.
Base Tube Material:
Any metallic material.
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G Fin (Embedded or Grooved Fin)
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Application: High-efficiency fin for high temperature applications.
Maximum Operating Temperature: 400°C
Manufacture: A helical groove is formed in the base tube without removing any
material and the fin is then wound into the groove under tension, followed by backfilling and
knurling of the displaced material to lock the fin root into the tube.
Fin Material: Aluminium/copper/stainless steel.
Base Tube Material: Any readily machinable material.
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Double L Fin (LL Fin) & L Fin
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Application:
Standard fin for low-temperature applications where some degree
of tube wall protection is required.
Maximum Operating Temperature:
120°C
Manufacture:
The fin foot is pre-formed into an L shape and applied to the base tube under
tension. Each fin abuts an adjacent fin, giving a degree of protection to the base tube in less
aggressive environments.
Fin Material:
Aluminium/copper.
Base Tube Material:
Any metallic material.
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Hot Dipped Galvanised Elliptical Tubes with Rectangular Fin
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Application:
This finned tube is optimally shaped and has excellent
thermodynamic properties. The fin collar forms a permanent metallic bond with the tube.
Corrosion resistance is excellent, thanks to hot-dip galvanising, which produces a protective,
self-healing, outer-layer. The design is compact, resulting in a small heat exchanger bundle face
area.
Maximum Operating Temperature:
350°C
Manufacture:
The fins are first punched out and then lined up automatically on
the tube. The end fins are fixed. Integrated spacers in the fins maintain the desired gap between
adjacent fins. The use of a specially developed hot-dip galvanising bath produces the best possible
metallic fin-to-tube bond and results in excellent heat transfer and mechanical properties.
Fin Material:
Steel (galvanised).
Base Tube Material:
Steel (galvanised).
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