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Longitudinal Finned Tube Overview

Longitudinal Finned Tubes are expertly crafted using resistance welding techniques to attach fins along the length of the tube. Initially, the fin strip is shaped into a U-channel, forming two fins from each side of the U. These channels are precision-cut to the correct length, positioned along the tube, and resistance welded in place. They are welded in pairs, directly opposite each other, so the number of fins is always a multiple of four.

Advantages of Longitudinal Finned Tubes:

1. Enhanced Durability: Offers a longer lifespan compared to standard helical fin tubes.
2. Safety and Energy Efficiency: Provides a safer and more energy-efficient heat transfer solution.
3. Improved Heat Transfer: Ideal for increasing heat transfer rates in viscous liquids.
4. Perforated Options: Includes perforated fin designs for efficient drainage when handling liquids.
5. Versatile Applications: Extensively used in horizontal heat exchangers.

Product Parameters for Longitudinal Finned Tubes:

• Base Tube Sizes:
  Ranges from 16 mm to 273 mm (10”), with custom sizes available upon request.

• Tube/Pipe Material Options:

  • Carbon Steel (A106, A333, A179, A210, P5, P11, P22, P9, etc.)
  • Stainless Steel (Grades 304, 316, 321, Duplex, Super Duplex, etc.)
  • Copper and Copper Alloys (Brass, Aluminum Brass, Copper Nickel 70/30 and 90/10)
  • Nickel Alloys (400, 600, and 800 series)
  • Compliance with all major standards such as ASTM, ASME, EN, BS, DIN, etc.

• Fin Material Choices:

  • Includes Carbon Steel, 11Cr Steel, Stainless Steel, Copper Alloys like Brass and Copper Nickel, and Nickel Alloys (400, 600, and 800 series).

• Fin Height Range:
  From 4.0 mm to 38.1 mm.

Product Specifications:

• Tube Outer Diameter (OD):
  16-273 mm (3/8”10” NPS)

• Tube Wall Thickness:
  2.11-25.4 mm (0.08”1”)

• Tube Length:
  Up to 12,000 mm (39 ft)

• Fin Thickness:
  1.0-1.5 mm (0.04”0.06”)

• Fin Height:
  525 mm (0.2”0.98”)

• Fin Pitch:
  1U~36U

• Fin Type:
  Options of “U” or “I/L” configurations

Material Combinations:

• Fin Material:

  • Carbon Steel (common grade: Q235B)
  • Stainless Steel (grades like AISI 304, 316, 409, 410, 321, 347)
  • Alloy Steel

• Tube Material:

  • Carbon Steel (common grade: A106 Gr.B)
  • Stainless Steel (grades like TP304, 316, 321, 347)
  • Alloy Steel (grades like T/P5, 9, 11, 22, 91)

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