Spiral Cold Wound Finned Tube

L/LL/KL Finned Tube Product Description:

LL Finned Tube(Overlapped L)

The fins are created from strips in a similar way to the L type except that the foot is prepared into a carefully controlled stepped double L shape, rolled into a taper that allows it to curl. The LL-Foot Fin – Overlapped L is next helically coiled onto a tube under tension. The fin clings the tube, with one fin overhanging the foot of the next fin and the base tube completely covered. The tube is well protected from corrosion as a result of this. In corrosive settings, this form of tube is frequently used as an alternative to the more expensive extruded type fin.

Fins are secured at each end in the same way that L fins are. The LL-type Fin Tube is suitable for temperatures of up to 350 degrees Fahrenheit (177C degree).

KL Finned Tube(Knurled Aluminum Tube)

The KL fin is also known as the knurled L fin. This finned tube is almost identical to the Wrap-On fin and is made using both Wrap-On and Embedded techniques. The fins are made from strips that have been prepared into a L shape that is comparable to the L type, then rolled into a taper that causes it to curl. It is then helically wound onto the tube in a continuous loop under tension. The tube is hugged by the fin. A spinning tool knurls the base tube, and then the foot of the fin is knurled into the knurling of the base tube, resulting in a tight bond and improved thermal performance.

The foot of one fin bumps up against the next fin if the correct fin strip is utilised, and there is no space between the fins. This helps to protect the tube from corrosion. In a similar way to L fins, the fins are attached at each end to prevent unwinding. In applications involving metal, KL -Foot tension wound finned tubes are typically employed. Up to 320°C (608°F) maximum operating temperature

L Finned Tube(L Finned Tube)

Finned on the L-Foot Tubes are utilised for applications that require a low temperature. L-Foot tension wound finned tubes are made out of a thin aluminium fin strip wrapped helically around the tube circumference. On one side of the fin strip, a “foot” is constructed first (hence the name L-Foot). The strip is then securely twisted around the tube, with the foot resting on the tube’s outside surface. Each L’s short horizontal leg makes perfect contact with the base tube surface. The fin strip’s tension as it wraps around the tube helps to seat the fin foot securely on the tube and hold the fin in place. At lower temperatures, L-footed finned tubing allows for maximum heat transfer.

The fins’ ends are stapled together to prevent the aluminium fin from unravelling and losing touch with the tube’s fin foot. The L-type fin tube is suitable for temperatures of up to 300 degrees Fahrenheit (149C degree).

L/LL/KL Finned Tube(L Finned Tube) Manufacturing Process:

Applied Fin Tube is made with strip wrapped under tension around the base of the tube. Fins are welded to the base tube at the strip ends.

L/LL/KL Finned Tube(Aluminum Finned Tubes) Advantages:

Core tube extensively protected against corrosion by the fin foot, finning of very thin-walled tubes possible.

L/LL/KL Finned Tube(Knurled Aluminum Tube) Properties:

Atmospheric Corrosion Resistance: OK
Mechanical Resistance: Poor
Fin Contact: Interference Fit
Fin To Tube Bond :Moderate
Heat Transfer Efficiency :Moderate

L/LL/KL Finned Tube(Knurled Aluminum Tubing) Applications：

. the petroleum, chemical and petrochemical process industries

. natural gas treatment

. the steel industry: blast furnace and converter systems

. power generation: steam turbine exhaust condensing

- contact condensing with cooling of circulating condensate

- fossil and nuclear power plants

. air conditioning (Freon, ammonia, propane)

. incineration of household refuse

. compressor coolers, etc.

L/LL/KL Finned Tube Specifications：