BGR ENERGY SYSTEMS LIMITED

BGR ENERGY

 

   Finned Tubes

"L" WRAP-ON FINS

"L" WRAP-ON FINS
Maximum working temperature  = 120 °C/250 °F
Atmospheric corrosion resistance   = Acceptable
Mechanical resistance      = Poor

The aluminium strip foot section is first formed into an L shape and then tension wrapped on to the base tube. Wound fin base sections are close to each other so as ensure a continuous cover over the primary tube surface. Finally, the fin strip is fastened at ends to prevent loosening.

KNURLED "L" FINS

KNURLED "L" FINS
Maximum working temperature  = 250 °C/480 °F
Atmospheric corrosion resistance   = Medium
Mechanical resistance      = Acceptable

An aluminum strip is folded to form an L shape and then wound around the base tube. The feet of the fins are joined together and covers the whole of the tube surface. The root of the fin is simultaneously knurled with the inner tube ensuring tight contact between fins and tube.

"G" EMBEDDED FINS

"G" EMBEDDED FINS
Maximum working temperature  = 400 °C/750 °F
Atmospheric corrosion resistance   = Poor
Mechanical resistance      = Acceptable

Fin consists of an aluminium strip whose foot edge is tension wrapped and embedded into the primary tube wall.

BIMETALLIC EXTRUDED FINS

BIMETALLIC EXTRUDED FINS
Maximum working temperature  = 300 °C/570 °F
Atmospheric corrosion resistance   = Excellent
Mechanical resistance      = Excellent

A core tube, or liner is fitted into an aluminium primary tube. This tube-in-tube assembly is then fed into the finning machine equipped with three spindles. The gang discs which are stepped in profile and diameter will first extrude and shape the fin properly and then shrink fit the primary tube on its liner.

 

 
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