finned, fin tube, finned tube heat exchanger

Fin Type: Fin Tube
Tube Material: Carbon steel, stainless steel, copper, aluminum
Fin Material: Copper, aluminum
Fin Tube Length: No Limit
Product description/LL/KL finned tube: Working temperature: 230?. Features: Adopting the winding process, the production efficiency is high, the lamella distance is uniform, the heat transfer is good, the finization ratio is high, the base tube can be protected from air erosion.

L/LL/KL Finned Tube

Finned tube is a tube with small finned fins around its outer surface. These fins act as a filter and a mechanism for transferring heat from the material inside the tube to or from the outer space. Finned tubes are used in applications where heat is transferred from a hot fluid to a cooler fluid through the wall of the tube. The rate at which this heat transfer occurs depends on three factors:

The difference in temperature between the two fluids.

The coefficient of heat transfer between each fluid and the wall.

Surface area of fluid exposure.

L type finned tube. Adopting the winding process, the production efficiency is high, uniform lamella distance , good heat transfer, high finization ratio, the base tube can be protected from air erosion. The aluminum fin or copper fin is folded into an L shape and continuously spirally wound on the outer surface of the base tube under the action of tension.

Maximum working temperature-150°C (302°F), acceptable for atmospheric corrosion resistance, poor mechanical resistance. Commonly used heat sink materials are aluminum and copper.

LL typefinned tube: Under the L-shaped foundation, the fin root completely covers the outer surface of the base tube; to some extent, this fin type guarantees better corrosion resistance. Maximum working temperature-180°C (356°F), acceptable for atmospheric corrosion resistance, poor mechanical resistance. Commonly used heat sink materials are aluminum and copper

KL type finned tube: 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. Maximum working temperature-260°C (500°F), acceptable for atmospheric corrosion resistance, poor mechanical resistance. Commonly used heat sink materials are aluminum and copper

L/LL/KL Finned Tube applications

Application: Mainly used in air coolers in petrochemical, electric power, paper making, tobacco, building heating and other industries, air heaters and air heaters in spray drying systems such as vegetable protein and starch in the food industry. Blast furnace and converter systems, power generation: condensate exhaust gas discharged from steam turbines, condensate contact cycle cooling condensation, fossil and nuclear power plants, air conditioners (Freon, ammonia, propane), waste incineration equipment, compressor coolers, etc.

‘L’ FIN TUBE, ‘LL’ FIN TUBE, ‘KLM’ FIN TUBE (WRAP AROUND FIN TUBE):-

The L’ FIN TUBE, ‘LL’ FIN TUBE, ‘KLM’ FIN TUBE also known as Wrap Around 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.

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.

The next version of wrap around Fin Tube and also of ‘L’ Fin Tube is ‘LL’ Fin Tube. The 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. It provides excellent corrosion resistance.

The last and the most widely used type of wrap around Fin Tube is ‘KLM’ Fin Tube or ‘Knurled L’ Foot Fin Tube.

This is currently one of the most widely type used and preferred Fin Tubes. This type of Fin Tube is manufactured similar to the ‘L’ Fin Tube. However, the process involves Knurling the Tube and at the same time the ‘L’ base of the fin stock to firm a frim bond and much better contact between the Fin and the Tube.

In all the above type of wrap around Fin Tubes the fins are held by Spiral Tension, The ends are required to be firmly held to gather by means of Mechanical Bonding, Brazing etc. This tube also has an added benefit of using Much Lower Thickness of the Base tube thereby reducing the cost considerably.

These Fin Tubes find application in AIR FIN COOLERS, RADIATORS etc. and are preferred in Industries like Power Plants, Chemical Industries, Petroleum Refineries, Chemical process Plants, Rubber Plants, etc.

Properties of ‘L’ FIN TUBE, ‘LL’ FIN TUBE, ‘KLM’ FIN TUBE (WRAP AROUND FIN TUBE):-

  1. Manufacturing Process: – Wrap Around the Base Tube with various iterations of the Fin Base
  2. Fin To Tube Bond:- Moderate
  3. Heat Transfer Efficiency:- Moderate
  4. Mechanical Resistance: – Moderate
  5. Corrosion Protection: – Good
  6. Temperature Range:- Up to Maximum 175 Deg C

Manufacturing Range ‘L’ FIN TUBE, ‘LL’ FIN TUBE, ‘KLM’ FIN TUBE (WRAP AROUND FIN TUBE):-

Sr. NoParticularsRange
1Base Tube MaterialStainless Steel, Carbon Steel, Alloy Steel, Titanium, Copper, Duplex Stainless Steel, Inconel etc. (all material in the theoretical limit)
2Base Tube Outside Diameter12.70 mm to 38.10 mm
3Base Tube Thickness1.25mm And Above
4Base Tube Length500 mm Min To 15000 mm
5Fin MaterialAluminum, Copper, Stainless Steel, etc.
6Fin Thickness0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.55mm, 0.60mm, 0.65mm
7Fin Density236 FPM (6 FPI) to 433 FPM (11 FPI)
8Fin Height 9.8 mm to 16.00 mm
9Bare EndsAs per Client Requirement
10Manufacturing Capacity5,00,000 Meter Per Annum

We can supply material on urgent delivery basis because of large stock and relations with raw material suppliers. We use only Prime Quality base tube and Aluminum Material.

The Extruded Fin Tubes can be supplied with EN 10204 EN 3.1 and EN 3.2 certifications. We can provide Third Party Inspection from any reputed inspection agency.

L Fin Tube
LL Fin Tube
KL Fin Tube

L/LL/KL/KLM Type Fin Tube, Wrapped Tension L Type Finned Tube For Heat Exchanger

Manufacturing process:

The fin strip (normally aluminum and copper) is folded into an L SHAPE and wound onto the base tube surface under tension. The feet of the fins are joined together and cover the finned surface.

Surface Protection:

Both bare ends shall be Zinc or Aluminum metalized applied by an electro spray arc system coating.

HFW Solid Finned Tubes short for High Frequency Welded Helical Spiral Solid Finned Tube

Helical Finned Tubes provide the designer with high thermal efficiency and compact design solutions for a whole range of heat exchangers where clean flue gases are used. Helical finned Tubes are manufactured in both Solid and Serrated type.

Helical Solid Finned Tubes are manufacturer by helically wrapping continuous fin strip on tube. HF Resistance Welding Usually Employs Frequency Of 400 kHz. The fin wound around the tube And Continuous weld. The fin strip is wounded spirally onto the tube and welded continuously with a high frequency electrical process to the base tube along the spiral root. The fin strip held under tension and confined laterally as it is formed around the tube, thereby ensuring that the strip is in forceful contact with the base tube surface. A continuous weld is applied at the point where the fin strip first begins to bend around the tube diameter, using the gas metal arc welding process.

For a given tube or pipe size, the desired heat transfer surface area per unit length of tube can be obtained by specifying the appropriate fin height, fin thickness and /or number of fins per meter of length.

HFW Solid Finned Tube

This welded steel finned tube configuration can be used for any practically heat exchanger application, and is particularly suited to high temperature and high pressure applications. The important features of this configuration are efficient, effective bond of fin to tube under all conditions of temperature and pressure, and ability to withstand high fin-side temperatures.

A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond.

Technical Details/Base Tube Details

Tube Diameter : 20 mm OD Min to 219 mm OD Max.

Tube Thickness : Minimum 2 mm up to 16mm

Tube Material : Carbon Steel, Stainless Steel, Alloy Steel, Corten steel, duplex Steel, Super Duplex Steel, Inconel, High Chrome High Nickle & Incolloy, CK 20 material and some other material.

Fin Details

Fins Thickness : Min. 0.8 mm to Max. 4 mm

Fins Height : Min 0.25” (6.35 mm) To Max.1.5” (38 mm)

Fin Density : Min 43 Fins Per Meter To Max. 287 Fins Per Meter

Material : Carbon Steel, Stainless Steel, Alloy Steel, Corten steel, Duplex Steel and Incolloy.

For a rapid quotation, plz send with following requirement:

Number of pieces,

base tube: Diameter, thickness, length and material specification.

Fins: material specification, type (solid or serrated), height, thickness, spacing, finned length and unfinned sections. Weld prep details if required.

Delivery period required.

Keywords: Fin tubes, Finned tube, Finned Pipe Helical Finned Tubes, Solid fin tubes, Serrated finned tube, Helical Serrated Finned Tubes, Tubos Aletados

* These are the most common fin/tube patterns. We have more than 20 different plate fin and tube combinations. Contact me for more information and options.

Helical Fin Surface
(Tube OD – Available Helical Fin Height on the Tube)

5/8″ – 3/8″, 1/2″ and 7/16″

1″ – 3/8″, 1/2″ , 7/16″ and 5/8″

1 1/4″ – 3/8″, 1/2″ , 7/16″ and 5/8″

15.875mm – 9.525mm, 12.7mm and 11.113mm

25.4mm – 9.525mm, 12.7mm, 11.113mm and 15.875mm

31.75mm – 9.525mm, 12.7mm, 11.113mm, and 15.875mm

  • “L” Footed, Embedded and other helical fin attachment options are available.
  • Contact me about the availability of 1 1/4″ (31.75mm) tube material

The common application fields are:

  1. Heat exchangers units for power plant(electric, nuclear, thermal and geothermal power plants);
  2. High corrosive systems (condensers, evaporators, sea water desalinations, fertilizing, urea systems, ammonia, gas, corrosive acids);
  3. The petroleum, chemical and petrochemical industries;
  4. The food processing and refrigeration industries;
  5. Natural gas treatment;

‘L’ Finned Tubes

One common type of finned tube is the ‘L’ fin. Receiving its name from the letter it creates from the cross-sectional view, the ‘L’ fin relies on maximum surface contact between fin and tube which is ensured by tension-forming a fin strip helically around the base tube.

This type of connection maximizes the heat transfer capacity and enhances the corrosion protection of the tube. The ‘L’ fin accommodates temperatures between 150 to 170 °C and comes in mainly ductile metals such as aluminum or copper which are capable of withstanding the compression around the base of the fin and allow stretching on the outside during installation.

Fig. 9: Typical Heavy-Duty Dry Air Cooler or Condenser – commonly using copper, aluminium or carbon steel tubes with helical aluminium or galvanized fins.
Note the removable bolts in the header box which allow for inspection and cleaning of the tubes.

Fig. 10: Copper finned tubes copper tubes

Fig. 11: Cross-sectional schematic of L fin

4. ‘LL’ Finned Tube

Manufactured in the same way as the ‘L’ finned tube, the ‘LL’ fin has overlapping feet to completely enclose the base tube, resulting in excellent corrosion resistance. The maximum operating temperature is approximately the same as the ‘L’ fin. This type of fin commonly available in aluminum and copper. The Overlapped “L” fin design has interlocking fins that are wound together to prevent movement and separation. The fins protect the entire tube and the designation works well for the applications where corrosion is an issue.

Fig. 12: Copper finned carbon steel tubes
Fig. 13: Cross-sectional schematic of ‘LL’ fin

5. ‘KL’ Finned Tube

‘KL’ Fin Tubes are also called knurled finned tubes. The fin is wrapped around the tube and the foot is rolled into the outer surface of the pre knurled tube and secured at each end. The fins are manufactured from a strip of metal which is machined into an accurately controlled L shape foot, similar to the L type fin, then it is rolled into a taper causing it to curl. The tube surface is knurled by a rotating tool, then the foot of the fin is knurled into the base tube providing a tight bond that optimizes thermal transfer.

Fig. 14: Aluminum finned carbon steel tubes
Fig. 15: Cross-sectional schematic of ‘KL’ fin

L/Ll /Kl Type Finned Tube/Heat Exchanger/ Fin Tube

Aluminum Finned Tubes type including: L/ KL/ LL type finned tube, Extruded finned tube, “G” embedded finned tube,HF spiral welding fin tube ,bend ,radiator. If you are interested in our products, please tell us the detail information or send your drawing, we will produce as your drawing.

Features:
1)Tube material: Stainless steel as ASME ASTM 213, 312 — 304L, 304, 316, 316L, 321 etc, . Carbon steel as ASME ASTM– 106, 179, 192, etc, alloy, Aluminum, and copper.

2)Fin material: Carbon steel, alloy, Aluminum, and copper, etc.

3)Bare tube size: OD 15.85mm-168mm.

L type finned tube:Adopting the winding process, the production efficiency is high, uniform lamella distance , good heat transfer, high finization ratio, the base tube can be protected from air erosion. The aluminum fin or copper fin is folded into an L shape and continuously spirally wound on the outer surface of the base tube under the action of tension.

Maximum working temperature-150°C (302°F), acceptable for atmospheric corrosion resistance, poor mechanical resistance. Commonly used heat sink materials are aluminum and copper.

LL typefinned tube: Under the L-shaped foundation, the fin root completely covers the outer surface of the base tube; to some extent, this fin type guarantees better corrosion resistance. Maximum working temperature-180°C (356°F), acceptable for atmospheric corrosion resistance, poor mechanical resistance. Commonly used heat sink materials are aluminum and copper

We can supply material on urgent delivery basis because of large stock and relations with raw material suppliers. We use only Prime Quality base tube and Aluminum Material.

The Extruded Fin Tubes can be supplied with EN 10204 EN 3.1 and EN 3.2 certifications.

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