High Frequency Welded Spiral Finned Tubes

Product Specification
Tube OD:	16mm to 273mm	3/8" to 10"(NPS)
Tube WT:	2.0mm to 28.6mm	0.08" to 1.13"
Tube Length:	28500mm max	94ft max
Fin Thickness:	0.5mm to 3.5mm	0.02" to 0.14"
Fin Height:	8mm to 35mm	0.32" to 1.38"
Fin Pitch:	3FPM to 333FPM	1FPI to 8FPI
Fin Type:	Solid, "U" or "V" Serrated

 

Material
Tube Material:	Carbon Steel: SA179, SA192, SA210A1, SA210C, SA106Gr.B Stainless Steel: TP304, TP316, TP321, TP347, 2205 Copper: UNS12200, 14200, 70600, CuNi70/30, CuNi90/10 Titanium: SB338Gr.2
Fin Material:	Aluminum: AL1100, AL1060, AL6063 Copper: (specification available upon request)

* This table is used as a general guide to our capabilities, please contact us for any other customized cases.

 

Optimized for:

• Waste Heat Recovery Systems
• Marine Engine Exhausts
• Flue Gas Condensers
• Biomass Boiler Systems

 

Welding Process
The steel fin, that may be solid or serrated, is helically wound and continuously welded to the tube by high frequency electric resistance welding (HFERW). This produces an homogeneous, clean and continuous fin-to-tube bond with no additional weld material, for a very efficient heat flow and resistance to corrosion.

Production Capacity
Total five PLC high frequency welded spiral finning lines, monthly production capacity is 1500 tons in total.

Codes and Standards

1. HG/T 3181-2009 High Frequency Resistance Welded Spiral Fin Tubes
2. International Standard For Dimensions, Tolerances and Tests of High Frequency Resistance Welded Fins
3. According to Client's Requirements or Technical Agreement if any

Surface Treatment and Protection
Each tube except stainless material will be polished by polishing machine to near bright condition before welding.
After welding, the finned tubes will be coated with anti-rust oil for transportation and site storage purpose, normally the coat will provide a period of 3~5 months prevention, any other coating material for longer prevention is also available as per clients' requirements.