Longitudinal Finned Tube | LFW Type Fin Tube | U Form Fins Finned Tube
I/L or U fins welded longitudinally onto the base tube. Also U-Bend execution possible.
Welded Longitudinal Fin Tube Materials:
Carbon Steels, Alloy Steels, Stainless Steel, Nickel Alloys, and others
Welded Longitudinal Finned Tube Fields of application:
Chemical-, Petrochemical-, Oil-, Power Industry,Heat-Exchangers,Fired Heaters,Gas Coolers and Heaters,Tank Heaters
Specification:
Outer diameter of base tube: ranging from an efficient 16 mm to a robust 168 mm
Wall thickness of base tube: expertly crafted from 2 mm to a sturdy 8 mm
Fin height: customizable from a precise 5 mm to a substantial 32 mm
Fin thickness: ranging from a delicate 0.8 mm to a durable 2 mm
Length of tube: fabricated to meet specifications from a compact 800 mm to an extensive 11,000 mm
Utilizing a soft regime of direct welding, each pair of fins is seamlessly affixed on opposite sides of the tube, boasting a distinct U-profile for optimized heat transfer. This innovative design not only enhances the joint’s strength but also ensures a flawless and even distribution along the tube’s circumference. The fins are meticulously shaped through gradual rolling, minimizing internal stress and allowing for an impressive profile length of up to 7 meters. Typically crafted from carbon steel for excellent thermal conductivity, we offer customization to meet specific customer requirements, using high-strength steel, Cr-Mo-Ni steels, or even austenitic, ferritic, and duplex steels. The fins’ height ranges from 5 to 32 mm, tailored precisely to customer specifications. The seamless tubes, matching the material range of the fins from carbon to duplex steels (ASTM, EN, GOST), are manufactured to precise tolerances of ± 6 mm.
Whether you need a single piece or require large-scale production, we accommodate all order sizes. Our tubes are available as either straight or U-bent, and we provide complete equipment solutions to meet diverse industrial needs.
Our Longitudinal Finned Pipes are integral in a multitude of industries such as petrochemical, chemical, power generation, nuclear power, and food processing. They are pivotal in heaters, coolers, heat exchangers, and various other equipment applications.
Our longitudinally finned tubes’ exceptional quality is underscored by their critical application in the primary circuits of nuclear power plants, where reliability and safety are paramount.
Longitudinal Finned Tubes Core Design Principle: Minimized Pressure Drop
The primary advantage of this configuration is the significant reduction in fluid flow resistance (pressure drop) compared to helical or transverse fins. By not obstructing the axial flow, they allow for higher flow rates with lower pumping energy, which is crucial for large-scale gas handling in air-cooled heat exchangers (ACHEs) or shell-and-tube units.
Key Applications and Advantages:
These tubes are ideal for:
Air Cooled Heat Exchangers (ACHEs): Where air flows lengthwise over the finned bundle.
Furnace & Boiler Applications: As waterwall or division wall tubes, where radiative and convective heat transfer is axial.
High-Viscosity Fluids: Where transverse fins could cause excessive flow blockage and fouling.
Their robust welded or extruded construction (often from carbon or stainless steel) ensures durability in high-temperature services. The design allows for a large heat transfer surface area in a compact layout, optimizing thermal performance where pressure drop is a critical limiting factor.
