Continuous Spiral Crimped Finned Tube

L/LL/KL Finned Tube Product Description:

LL Finned Tube(Overlapped L Fin)

Application: Standard fin for low-temperature applications giving increased atmospheric corrosion protection of the base tube.

Upper limiting temperature: 180°C

Manufacture: Fin foot is pre-formed into an LL shape (overlapped LL) and applied to base tube under tension. However, foot is pre-shaped to give overlap of one foot onto another, thereby improving base tube protection and thermal contact area

Fin materials: Aluminium

Base tube materials: Any metallic material

KL Finned Tube(Knurled Aluminum Tubing)

Application: Standard fin for medium-temperature applications, giving increased atmospheric corrosion protection to the outer surface of the base tube

Upper limiting temperature: 250°C

Manufacture: Fin foot is pre-formed into an L shape and applied to base tube under tension. Knurling tools both precede and follow the laying down of the fin foot so that the fin material is locked into the pre-knurled tube. This gives up to 50% greater thermal contact area than standard L fin and also ensures an airtight fin to tube bond, resulting in greater tube protection

Fin materials: Aluminium

Base tube materials: Any metallic material

L Finned Tube(Wrapped Fin)

Application: Standard fin for low-temperature application where some degree of tube wall protection is required

Upper limiting temperature: 120°C

Manufacture: Fin foot is pre-formed into L shape and applied to base tube under tension. The adjacent fins abut one another, giving a degree of base tube protection for less aggressive environments

Fin materials: Aluminium

Base tube materials: Any metallic material

 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:

L Finned Tube

Suitable for low-temperature application.

The finning type is the most cost effective method compared to the others.

The failed fins can be easily removed during production and bare tube can be used again for finning.

There is no need for make a helical grove over the core tube.

It is possible to place the fins on a very thin-walled tube with is particularly desirable when using expensive alloys as core tube.

The tube can withstand a temperature of up to 130°C without the risk of atmospheric corrosion or thermal stress.

LL Finned Tube

This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.

Maximum operating temperature 170ºC.

KL Finned Tube

Corrosion-resistant Tubes

Vibration resistance

It can withstand temperatures of up to 320°C (608°F).

High thermal performance and stress resistance combined with protection from air corrosion is a one-of-a-kind combo.

Any form of finned tube can be replaced with KL.

 

L/LL/KL Finned Tube Properties:

Atmospheric Corrosion Resistance: OK

Mechanical Resistance: Poor

Fin Contact: Interference Fit

 

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：

Product Specification
Tube OD	19~51 (mm)	3/8”~2”
Tube Wall Thk	1.65~3.0(mm)	0.065”~0.118”
Tube Length	≤18,500 (mm)	≤60.7 ft
Fin Thk	0.3~0.5 (mm)	0.012”~0.02”
Fin Height	10~16 (mm)	0.394”~0.63”
Fin Pitch	100~433 FPM	3~11 FPI
Fin Type	L,LL,KL
Material Combinations
Fin Material	Aluminum (most common grade:Alu.1100, Alu.1060, Alu. 6063)
	Copper
Tube Material	C.S. (most common grade: A179, A192,SA210 GrA1/C,A106 Gr B )
	S.S. (most common grade: TP304, 316)
	Copper (most common grade:UNS12200,14200, 70600, CuNi70/30, CuNi 90/10)
	Titanium (most common grade: B338Gr2)
Applied Temperature	L Type:150°CL,LL Type:180°C,kL Type:260°C
Type of Service	L Type:Low temperature LLType:Low temperature, corrosive atmospheric environment applications KL Type:Medium temperature