Creating a niche of Finned Tubes such as Extruded Fin Tube, L Or Wrap - On Finned Tube, KL Or Knurled Finned Tube, LL Or Overlapped Finned Tube, Wire Wound Fin Tube and Crimped (Tension Wound & Root Soldered) at its best, with utmost quality.
The Extruded Fin is formed from an outer aluminum tube with a large wall thickness (Muff) which is aligned over an inner base tube. This assembly is fed into the fining machine which literally squeeze and extrude the aluminum fins up and out of the muff material in a spiral shape and give firm pressure contact with the base tube in a cold rotary extrusion process.
These are high efficiency fins for the high temperatures. These fins provide the base tube with complete and permanent corrosion protection against atmospheric contaminants.
The L type fin is also known as wrap on fin. The fins are wound under tension over the base tube and the contact between the fin and the base tube is by 'L' foot shape and thus provides some degree of tube wall protection. These are standards fins for low temperature application.
The KL type fin is manufactured similar to L fin except that the base tube is knurled before wrapping the “L" shaped fin strip. Thereafter the foot of the fin is knurled into the knurling of the base tube to ensure tight bond with the base tube resulting into increased thermal performance.
The LL type fin is commonly known as double L or overlapped L fin manufactured in the same way as the L fin type except that the foot is overlapped to completely cover the base tube thereby giving excellent corrosion resistance. This type is used as an economical alternative to extruded type fin. The overlapping prevents separation and movement under cyclic.
These tubes are manufactured using wire in place of strip and wound helically over the tube with root soldering at foot to avoid air gaps between fin and the tube resulting in to higher heat transfer efficiency, reliability and longer service tube.
These types of fins are crimped and wrapped under tension over the base tube and automatically root soldered at the base for better bonding.