L/LL/KL Finned Tube Product Description:

- L Finned Tube

The L Fin Tube ,  LL FIN TUBE ,  KL FIN TUBE also known as Winding Fin Tube . This type of fin tube widely finds acceptance where the heat transfer temperature is relatively lower and the cost needs to be controlled. These type of fin tubes are relatively lesser in cost as compared to the ‘G’Type Fin Tube and the Extruded Type Fin Tube .

Description

In ‘L’ Type Fin Tube or also known as ‘L’ Foot Fin Tube the finning is done by wrapping around the Fin stock spirally around the base tube. This is as reason also known as spirally wound Fin Tube. The base of the fin stock is shaped in to and ‘L’ shape which gives a base for the fin to stand on firmly. Also the ‘L’ shape provides a certain protection against the atmospheric corrosion.

- LL Finned Tube

LL type winding finned tube: under the l-type foundation, the fin root completely covers the outer surface of the base tube, which can strengthen the contact surface and increase the heat exchange effect.

Maximum operating temperature: 170℃.

Double “L” fin is used on applications requiring additional corrosion protection to the surface of the base tube. The production process is similar to the L Fin Tube type . However , the improvement is that the ‘L’ Foot of the previous fin is completely overlapped by the ‘L’Foot of the next fin. This gives the Fin base a shape of tow ‘L’ foot simultaneously.

Operating temperature is a little higher than for L fin.

A wide range of both tube and fin materials are available.

Heat transfer performance can be enhanced by utilising unique internal solder bonded or pulled in secondary surface/turbulator system.

- KL Finned Tube（Knurled Aluminum Tubing）

KL type finned tube is also known as knurled finned tube. It is used to roll the pattern on the base tube before winding the fin, or to add a blade on the winding machine. Knurling is used on the base tube, and the blade behind is used for winding.

Before the fins are continuously wound on the surface of the steel pipe, the outer surface of the base pipe needs to undergo a knurling process; after the fins are wound, the root of the fin attached to the steel pipe will also be knurled to strengthen the steel pipe and Combination of fins. For this reason, this fin type ensures better heat transfer characteristics under the fins of L and LL. Commonly used heat sink materials are aluminum and copper

L/LL/KL Finned Tube(Knurled Aluminum 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 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 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：