Basic Info.
Packaging & Delivery
Product Description
The high-frequency welded spiral finned tube is to use the skin effect and proximity effect of high-frequency current to heat the outer surface of the steel strip and the steel tube until the plastic state or melting, while the steel strip is wound around the steel tube, under a certain pressure of the winding steel strip.
Finish welding. This high-frequency welding is actually a solid-phase welding. Compared with methods such as inlay, brazing (or integral hot-dip galvanizing), it is more advanced in terms of product quality (high welding rate of fins, up to 95%), productivity and automation.
Finned tubes are the main components of heat exchangers.
They are a series of tubes where fins have been added on the outside to increase the contact area with the outside fluid, to exchange heat and between the fluid inside the tube and the fluid outside the tube.
Finned tubes are elongated aluminium cladded carbon steel flat tubes with brazed aluminium fins.
Multiple types and shapes of finned tubes exist including round tubes, oval tubes, or flat tubes.
Flat tubes, made of aluminium clad carbon steel tubes with aluminium brazed fins, are the state of the art for power plant air cooled condensers.
Technical Specifications for Monometalic Extruded Finned Tubes:
| Tube Code | D | d | dw | P | Fins per Inch |
| mm | mm | mm | mm | Nos. | |
| MM-38-20-16-2.8 | 38 | 20 | 16 | 2.80 | 9 |
| MM-38-20-16-2.5 | 2.54 | 10 | |||
| MM-38-20-16-2.3 | 2.30 | 11 | |||
| MM-51-29-25-3.6 | 51 | 29 | 25 | 3.62 | 7 |
| MM-51-29-25-3.1 | 3.17 | 8 | |||
| MM-51-29-25-2.8 | 2.80 | 9 | |||
| MM-51-29-25-2.5 | 2.54 | 10 | |||
| MM-51-29-25-2.3 | 2.30 | 11 | |||
| MM-57-33-29-3.6 | 57 | 33 | 29 | 3.62 | 7 |
| MM-57-33-29-3.1 | 3.17 | 8 | |||
| MM-57-33-29-2.8 | 2.80 | 9 | |||
| MM-57-33-29-2.5 | 2.54 | 10 | |||
| MM-57-33-29-2.3 | 2.30 | 11 | |||
| MM : Monometalic Extruded Finned Tubes | |||||
| D : Fin outer diameter | |||||
| d : Root diameter | |||||
| dw : Tube ID | |||||
| P : Fin pitch | |||||
Items | Code | Dimensions | Tolerances |
Tube outside diameter | D1 | Φ25~Φ219 mm | ±0.2 mm |
Fin outside diameter | D2 | Φ37~Φ279 mm | ±0.75 mm |
Fin pitch | M | 4~90 mm | ±0.2 mm |
Fin height | H | 6~30 mm | ±0.75 mm |
Tube thickness | δ1 | 2~16 mm | ±0.15 mm |
Fin thickness | δ2 | 0.8~2.5 mm | ±0.1 mm |
Unfinned tube ends length | L1 | customized | ±1‰*L1 mm |
Unfinned tube ends length | L2 | customized | ±1‰*L2 mm |
Maximum tube length | L | 0.5~25 m | ±1‰*L mm |
