Heat Transfer Surfaces

LL Finned Tube

Double ā€œLā€ fin is used on applications requiring additional corrosion protection to the surface of the base tube. It is produced similar to ā€œLā€ fin but has a wider fin base which is overlapped during the winding process.
Maximum operating temperature 175℃.
We can also fin Nominal bore tube from 3/8" to ¼".

Manufacturing Details

Aluminium "LL" finned tube

Max. Fin Height - 22.22 mm(0.875")
Min. Fin Height - 6.35 mm (0.25")
Max. Fin Density - 15.8 FPI (622 FPM)
Min. Fin Density - 8 FPI (315 FPM)
Max. Tube Diam. - 38.1 mm (1.5")
Min. Tube Diam. - 9.5 mm (5/8")
Max. Tube Length - 15m (49 ft)


Copper "LL" Finned Tube

Max. Fin Height - 19.05 mm(0.75")
Min. Fin Height - 6.35 mm (0.25")
Max. Fin Density - 12.4 FPI (488 FPM)
Min. Fin Density - 8 FPI (315 FPM)
Max. Tube Diam. - 38.1 mm (1.5")
Min. Tube Diam. - 12.07 mm (5/8")
Max. Tube Length - 15m (49 ft)


Base Tube Material

Carbon Steel, Stainless Steel, Copper, Copper Alloys, Titanium.
LL Finned Tubes