Spiral L Form Fin Tube Suppliers in China
The LL-Foot Fin Tube, also called the Overlapped L-type fin tube, is widely used in heat exchangers. It features a base tube with fins made by overlapping L-shaped strips onto the surface. These fins are attached in a way that forms an “LL” pattern, providing enhanced heat transfer and increased protection against corrosion.
LL fin tube, also known as the Overlapped L fin tube, is similar to the L fin tube but with overlapping fin feet for added corrosion protection. The fins are helically wound around the base tube, creating a strong mechanical bond that enhances heat transfer. It is a cost-effective alternative to extruded fin tubes, commonly used in corrosive environments.
The process of producing LL-Foot Fin Tubes includes these steps:
Preparation: The base tube, typically made from materials like copper, stainless steel, or carbon steel, is cut to the desired length and prepared for finning.
Finning: L-shaped fin strips, made from materials like aluminum or copper, are overlapped and wrapped around the tube to enhance heat transfer.
Bonding: The fins are securely attached to the tube using mechanical bonding, soldering, or brazing, ensuring a strong and durable connection.
Advantages of LL-Foot Fin Tube – Overlapped L-type fin tube:
1. Enhanced heat transfer: The L-shaped fins increase the surface area of the tube, which improves heat transfer efficiency. This allows for more effective heat exchange between the fluid inside the tube and the surrounding environment.
2. Compact design: LL-Foot Fin Tubes provide a higher heat transfer rate compared to smooth tubes, allowing for a more compact heat exchanger design. This is particularly beneficial in applications where space is limited.
3. Reduced fouling: The finned surface of LL-Foot Fin Tubes reduces the likelihood of fouling, such as the deposition of scale or sediment, which can negatively impact heat transfer performance. The fins create a turbulent flow regime that helps prevent fouling.
Quality Control for LL type fin tube
The quality of the LL-foot finned tube is assured by hydrostatic or pneumatic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and the outer fins.
Delivery condition:
Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with Anti-rust at both ends of LL type fin tube.
LL-Foot Fin Tube Typical Size
| Base Tube O.D (mm) | Base Tube
Thickness (mm) |
Fin Height (mm) | Fin Thickness (mm) | Fin Pitch (mm) |
| 15.88 mm ~50.8 mm | 1.0 mm ~3.0 mm | 6.35 mm ~ 25.4 mm | 0.3 mm ~0.5 mm | 2.1 mm ~ 6.0 mm |
| Base Tube Material | Fin Material | Tube Length (Mtr) | ||
| Carbon Steel ,Alloy Steel ,Stainless Steel, Copper Alloy | Aluminum, Copper | ≤ 18Mtrs | ||
LL Type Fin Tube Material
The base tube is made of Carbon Steel Tube(A106 Gr.B, A179, A192),aluminum fins LL footed
Overlapped L Type Fin Tube By Industy
LL type finned tube are widely used in various industrial fields, especially in the petroleum, chemical, electric power and metallurgical industries. Its excellent corrosion resistance and high strength make it perform well in waste heat recovery, boiler energy-saving transformation and air preheating systems. In addition, LL-type fin tubes are also widely used in the field of green energy, such as solar thermal collection systems, geothermal energy utilization, and industrial waste heat power generation projects.
Top Features of LL Type Fin Tube
Datang offers the widest variety of sizes available for spiral LL type fin tube in the industry.Its heat exchange efficiency can reach several times or even dozens of times that of ordinary heat exchangers.
1. Suitable for using in low-temperature application
2. LL foot fin tube is the most cost effective way compared to the others.
3. The failed fins could easily removed during production and bare tubes can be used again for fining.
4. There is no need to make a helical groove over the core tube.
5. Spiral LL form fin tube is possible to place the fins on a super thin-walled tube with is particularly desirable when using expensive alloys as core tubes.
6. The overlapped L finned tube can withstand a temperature of up to 130°C without the risk of atmospheric corrosion or thermal stress.
Customizable Overlapped L Fin Tube
We can customize the material, specification and length according to your requirements.Solve your problems anytime and anywhere. Customize fin tubes and equipment according to your needs. Provide free technical guidance. Welcome to customize with drawings, so that you can purchase without worries.
Differences Between L KL LL Type Finned Tubes
L type wound fin tube: maximum operating temperature is 150°C.
LL type wound fin tube: maximum operating temperature is 170°C.
KL type wound fin tube: maximum operating temperature is 250°C.
Double L Fin Tube Package
Payment Terms:T/T, LC
Delivery: 15-30 days after payment
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Iron frame packing boxes and the desiccants are put into each package for continental transportation as well. or as required
Spiral LL Form Fin Tube Quality Checks
Each of our spiral LL type finned tube is subjected to stringent quality checks.Inspection and Tests Performed:
1.Chemical Composition inspection。
2.Mechanical Properties Test(Tensile Strength, Yield Strength, Elongation, Flaring, Flattening, Hardness, Impact Test).
3.Surface and Dimension Test.
4.No-destructive Test.
5.Hydrostatic Test.
LL Type Finned Tube Application
The application of spiral LL form fin tubes in drying equipment is mainly reflected in its characteristics of efficient heat exchange and optimized air flow distribution. The L foot fin tube significantly improves the heat exchange efficiency and work efficiency of the drying equipment by increasing the heat dissipation area and optimizing the air flow distribution.
Power plant air coolers require efficient and stable heat dissipation equipment to ensure the normal operation of generators and motors. The efficient heat transfer and low air resistance characteristics of Overlapped L type finned tubes make them ideal heat dissipation elements. In addition, the excellent performance of Overlapped L type finned tubes in high temperature and high humidity environments also makes them particularly suitable for the needs of power plants.
In power plants, double L fin tubes are often used in condensers and evaporators of cooling systems. By optimizing heat transfer efficiency and reducing equipment size, LL foot finned tubes significantly improve the energy efficiency and operational stability of power plants. In addition, its corrosion resistance and high strength properties also allow it to perform well in harsh environments and extend the service life of equipment.
The application of surrounding Wrap around LL foot finned tube in oil coolers is mainly reflected in its efficient heat transfer performance and structural features. Surrounding Overlapped L type fin tubes perform well in oil coolers by increasing the outer surface area of the heat exchange tubes, significantly improving heat transfer efficiency.
Related Product
LL Type Fin Tube FAQs
A: L LL KL type fin tube production line 12.
A: We can provide L LL KL type fin tube samples for free.
A: After you confirm spiral L LL KL form fin tube sample details, the samples will be ready for delivery in 3-7 days,and will be sent to you via express and arrive in 3-5 days.
A: wrap around L LL KL foot finned tube can be customized, we can make the new thermoforming or extruding mode based on your drawings and we can sign a confidentiality agreement about your patented product, pls contact us for any further information.
A: Always a pre-production sample,before mass production;always final inspection before shipment.
Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.