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ASME SA213 T12 High Efficiency Welded Helical HFW Helical Spiral Serrated Finned Tube For Heat Exchanger Air Cooling
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.
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.
| Grade | UNS Designation | Composition, % | ||||||
| Carbon | Manganese | Phosphorus, max | Sulfur, max | Silicon | Chromium | Molybdenum | ||
| T2 | K11547 | 0.10-0.20 | 0.30-0.61 | 0.025 | 0.025 | 0.10-0.30 | 0.50-0.81 | 0.44-0.65 |
| T5 | K41545 | 0.15 | 0.30-0.60 | 0.025 | 0.50 | 0.50 | 4.00-6.00 | 0.45-0.65 |
| T9 | K90941 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 |
| T11 | K11597 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| T12 | K11562 | 0.05-0.15 | 0.30-0.61 | 0.025 | 0.025 | 0.50 | 0.80-1.25 | 0.44-0.65 |
| T17 | K12047 | 0.15-0.25 | 0.30-0.61 | 0.025 | 0.025 | 0.5 | 0.80-1.25 | 0.44-0.65 |
| T21 | K31545 | 0.05-0.15 | 0..30-0.60 | 0.025 | 0.025 | 0.5-1.00 | 2.65-3.35 | 0.80-1.06 |
| T22 | K21590 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 1.90-2.60 | 0.05-0.30 |
Pipe Diameter: Min. OD 20mm to Max. OD 219mm.
Tube Thickness: Min. 2mm to 16mm
Pipe material: stainless steel, alloy steel, carbon steel, Corten steel, duplex steel, super duplex steel, Inconel, high chromium high nickel and some materials such as Incolloy, CK 20 material.
Fin detail
Fin Thickness: Min. 0.8 mm to max. 4 mm
Fin Height: 0.25" (6.35 mm) minimum to 1.5" (38 mm) maximum
Fin Density: Minimum 43 fins per meter, maximum. 287 fins per meter
Materials: Carbon Steel, Stainless Steel, Alloy Steel, Weathering Steel, Duplex Steel and Incolloy.
If you need a quick quote, please send as follows:
1. The number of pieces,
2. Base pipe: (1) diameter, (2) thickness, (3) length and (4) material specification.
3. Fins: (1) material specification, (2) type (solid or serrated), (3) height, (4) thickness, (5) pitch, (5) fin length and (6) finless section .
If necessary, weld preparation details.
4. Desired delivery date.
