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Nanjing Metalli Industrial Co., Ltd.

Ll Footed Fin Tube, Overlapped L Footed Fin Tube, Double L Footed Fin Tube manufacturer / supplier in China, offering Hot Sale Ll Footed Fin Tube, Hot Selling Nocklok 4343 Both Sides Aluminum Cladding Foil, Hot Sale Aluminum Coil for Nocolok and so on.

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Hot Sale Ll Footed Fin Tube

FOB Price: US $8 / Meter
Min. Order: 100 Meters
Min. Order FOB Price
100 Meters US $8/ Meter
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Port: Shanghai, China
Production Capacity: 1000 Kilometers Per Month
Payment Terms: L/C, T/T, D/P, Western Union, Money Gram

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Basic Info
  • Model NO.: ftll1001
  • Performance: Pressure Resistant, Temperature Resistant
  • Certification: ISO
  • Material of Base Tube: Carbon Steel, Stainless Steel, etc.
  • Length: Max 15000 mm
  • Fin Wall Thickness: 0.4 to 0.8 mm
  • Base Tube Outer Diameter: 16 to 51mm or Customized
  • Packing Way: Best Suitable Packing Way
  • Trademark: OEM
  • Specification: Custom
  • HS Code: 8708919000
  • Customized: Customized
  • Brand: OEM
  • Style: Drum
  • Material of Fins: Aluminum, Aluminum Alloy
  • Fin Height: Max 25mm
  • Base Tube Wall Thickness: Min 1.5 mm
  • Fin Quantity Per Inch: 6 to 12 PCS
  • Place of Origin: Jiangsu, China
  • Transport Package: Best Suitable Packing Way
  • Origin: Jiangsu, China
Product Description
1. Product brief
1.1.Manufactured in the same way as the 'L' finned tube type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.
"L" Foot or Shoulder tension construction assures uniform fin spacing, rigidly interlocked by the fin radius overlap over the exposed shoulder edge.
The strip material is subjected to controlled deformation under tension giving the optimum contact pressure of the foot of the fin onto the base tube thus maximizing the heat transfer properties. The foot of the fin considerably enhances the corrosion protection of the base tube. Max. operating. temp. 150ºC
Our L-foot finned tubes consist of aluminum fins formed into an L-foot configuration and wound helically around the tube while under tension.  We offer both solid fin and perforated fin L-foot finned tubes.
2. Product main properties
2.1Tubing outside diameter0.63" to 1.5"
2.2Tubing length"L" foot requires a production run.Up to 50' standard. No single pieces.
2.3Number of fins per inch (FPI)4 to 12
2.4Fin heightUp to 0.63"
2.5Fin thickness0.015",0.02",0.03",etc.
2.6Tube wall thicknessMin 0.06"
2.7Fin materialAluminum fin only
2.8Tube materialCarbon steel,stainless steel,copper,brass,etc.
2.7Operating temperatureUp to 180ºC 
3. Packing,Shipping and others
3.1PackingTo be packed in wooden crate
3.2MarkingEach box to be legibly marked with the name of the manufacturer or supplier, the designation of material,condition,dimensions and weight
3.3Shipping toolsShip goods by van to departune port then by sea or air to desitination
4.Quality assurance and spot management
4.1Quality control1. Quality assurance
a. Incoming material quality assurance; b. Process quality assurance; c. First sample quality assurance; d. Final quality assurance.
2. Process management-The right results are from the right process
a. Production process card control; b. Standard operational procedure;c.Job certification;d. Quality chart monitor.
3. Equipment and facility management
a. Periodic maintenance; b.Preventative maintenance.
4. Mold management
a. Mold life management; b.Periodic and preventative maintenance; c. Periodic inspection.
4.2Inspection ToolsAltimeter,Vernier caliper,Micrometer,3D coordinate measuring instrument
4.3Spot management"5S" management (sort,set in order,shine,standard,sustainable).

5. Questions & answers: 

5.1. What Type of Fin Should I Use?
The choice between Aluminum L-foot and the welded finned tubes (helical and longitudinal) is usually clear -- aluminum L-foot finned tubes are generally used in air-cooled applications with service temperatures below 400 degrees F.  Within the aluminum L-foot category, the choice between solid fin and perforated fin is less clear, and depends upon whether you want to take advantage of the improved heat transfer efficiency claimed for perforated fin.
Within the welded fin types, our experience with customers indicates that the choice between helical fins and longitudinal fins generally depends on the direction of fluid flow across the fins, with the objective of having the fluid pass between the fins, rather than across the fins.  For example, in the case of a tank heater, fluid flow is caused by convection currents within the tank -- as the fluid next to the finned tube is heated, it rises vertically, and the colder fluid near the top of the tank drops vertically.  Therefore if a tank heater is to be installed with the finned tubes oriented vertically, Longitudinal Finned Tube may be the best choice, since the rising fluid will pass in a direction parallel to the longitudinal axis of the tube, and between the fins.  However if the heater is to be installed horizontally, helical fins may be the best choice, since the fluid flow would be perpendicular to the axis of the tube, and between the helical fins.
If the choice is for welded helical finned tubes, a further decision is required -- Helical Solid or Helical Serrated? ...
- For some tube/fin configurations, helical serrated gives greater surface area than solid, and for other tube/fin configurations the reverse is true.  A comparison of surface area may be made by using the tables included in Design Info. 
- A definite advantage of helical serrated is that for a given pipe size, a greater fin height can be used for serrated than for solid.  This is because the serrations, or cuts, in the fin strip allow a greater fin strip width to be formed around a given size tube without significant deformation of the fin.
- It has been claimed that helical serrated offers an advantage over helical solid, particularly for lighter fluids, in that the serrated segments allow some lateral (cross-fin) flow of fluid along the tube axis, which serves to increase turbulence, thereby breaking up the thermal boundary layer and increasing heat transfer efficiency; and also slows the formation of fouling deposits between fins. 
The decision which type of fin to use is yours -- Metalli stands ready to provide any type of finned tube you need.
5.2. Why Use Finned Tubes?
Finned tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall.  The rate at which such heat transfer can occur depends on three factors: (1) the temperature difference between the two fluids; (2) the heat transfer coefficient between each of the fluids and the tube wall; and (3) the surface area to which each fluid is exposed.  In the case of a bare (unfinned) tube, where the outside surface area is not significantly greater than the inside surface area, the fluid with the lowest heat transfer coefficient will dictate the overall heat transfer rate.  When the heat transfer coefficient of the fluid inside the tube is several times larger than that of the fluid outside the tube (for example steam inside and oil outside), the overall heat transfer rate can be greatly improved by increasing the outside surface area of the tube.  In mathematical terms, the product of heat transfer coefficient for the outside fluid multiplied by outside surface area is made to more closely match the  product of the inside fluid heat transfer coefficient multiplied by tube inside surface area.
So the whole concept of finned tubes is to increase outside surface area.  As an example, a common finned tube configuration of 2" (nominal) pipe with 3/4" high welded helical solid fins of 12 gauge thickness with 6 fins per inch has an outside surface area of 8.23 sq. ft. per linear foot; whereas the same bare pipe has an outside surface area of only 0.62 sq. ft. per linear foot.  (See Design Info for extensive tables of surface areas and fin weights.)
The advantage of finned tubes is that by increasing overall heat transfer rate, the total number of tubes required for a given application is reduced, thereby also reducing overall equipment size and decreasing the cost of the project.  In many application cases, one finned tube replaces six or more bare tubes at less than 1/3 the cost and 1/4 the volume.
5.3. What Materials Are Used for Finned Tubes?
For Aluminum L-Foot finned tubes, the fin material is aluminum, either 1100-0 or 5005.  The tube material is generally carbon steel, stainless steel, or brass; however the tube can be of any material.
For Welded Helical Solid and Welded Helical Serrated finned tubes, the fin and tube materials can be any combination that can be welded together using the GMAW (gas-metal-arc-welding) process.
For Welded Longitudinal finned tubes, the fin and tube materials can be any combination that can be resistance welded together.
The materials chosen for a given application are a function of service temperature, corrosive environment, and/or erosive environment.  Common tube materials used for our welded product lines include: carbon steel, carbon moly, chrome moly, stainless steel, Inconel, and Incoloy.  Common fin materials include: carbon steel; stainless steels of types 304, 310, 316, 321, 409, and 410; Nickel 200, and Inconel. 
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