Longitudinal Finned Tubes, Brown Fintube

What is the longitudinal finned tubes?

Longitudinal Finned Tubes are produced by resistance welding the fins on the base tube in the longitudinal direction along the length of the tube.

How the longitudinal finned tubes manufacturing process?

Firstly form the steel fin strip into a U-shaped channel, then each U channel form as a fin.

Then channels are cut to the appropriate length and then oriented along the length of the tube and resistance welded on tube.

The channels are welded in pairs, diametrically opposed, therefore the number of fins specified must always be a multiple of four.

The longitudinal I/L or U shape fins are welded onto the core plain tubes by resistance welding or welding with filler metal (Spot welded).

Longitudinal finned tubes supply range:

1. U bends tubes with longitudinal fins and fin tube coils are available for requesting.
2. Longitudinal fins types: one-piece shape, standard U bent shape, cut & twist, perforated type etc…
3. The fin channels are welded to the tubes in opposite pairs. Fin height, number of fins and fin thickness can be specified.
4. Fins can be applied to either OD tube or NB pipe.

Longitudinal finned tube applications:

The longitudinal finned tubes are widely used in following fields.

1. Chemical- ,petrochemical-,oil-, and power industry
2. Heat exchanges
3. Fired heaters
4. Gas coolers and heaters
5. Tank heaters.

Longitudinal Finned Tube material specifications:

Materials of tubes: Carbon Steel (A106/A179/A192/A210) Stainless Steel (TP304/TP304L ,TP316/TP316L), Alloy Steel (T11/T22) not limited

Fins Materials: Carbon Steel, Stainless Steel(TP304/TP304L,TP316/TP316L, TP409/TP410) not limited

Longitudinal Finned Tube typical sizes:

Bare tube size: OD 19.05mm-OD76mm Number of fins: 2/ 4/ 8/ 16/ 18/ 32/ 36/ 40/ 48 piece per row

Longitudinal Finned Tube Competitive Advantage:

1. Longer working life than others ordinary welding helical fin tubes.
2. Much safer and energy saving.
3. Increase the heat transfer rates for viscous liquids.
4. Perforated fin type used whenever drainage of liquid from fin channels become a problem.
5. Longitudinal fin tubes are widely used in horizontal heat exchangers.