Finned tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall. The whole concept of finned tubes is to increase the outside surface area of the tube. By increasing the outside surface area of the tube, the overall heat transfer rate is increased, thereby reducing the total number of tubes required for a given application. This reduces the overall equipment size and the cost of the project. In many cases, one finned tube replaces six or more bare tubes at less than 1/3 the cost and ¼ the volume.
There are some applications for which one or the other fin type is preferred. While in some cases fouling and cleaning considerations will favour solid fins, serrated fins are superior with respect to weight, compactness and price.
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.
The use of high-frequency current results in very localized heating of the tube surface and the edge of the fin. This skin effect produces higher weld speeds, hence post-weld heat treatment is not considered necessary because of the superficial nature of the changes in the microstructure.
Total four(4) PLC high frequency welded spiral finning lines, monthly production capacity is 800 tons in total.
Dimension and Material
The following table shows Simcan’s manufacturing capabilities:
16 to 273 (mm)
3/8” to 10”(NPS)
Tube Wall Thk.:
2 to 28.6 (mm)
0.08” to 1.1”
0.5 to 3.5 (mm)
0.02” to 0.14”
8 to 35 (mm)
0.31” to 1.3”
3 to 333 FPM
1 to 8 FPI
Solid, “U”or“V” Serrated
* This table is used as a general guide to our capabilities, please call us for any other customized cases.
Codes and Standards
HG/T 3181-2009 High Frequency Resistance Welded Spiral Fin Tubes
International Standard For Dimensions, Tolerances and Tests of High Frequency Resistance Welded Fins
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 white 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 months prevention, any other coating material for longer prevention is also available as per clients’ requirements.
Each package is designed and made according to seaworthy packing standard and clients’ handling and lifting capability.
Finned tubes will be packed into steel frameworks and wrapped with weather proof PE film and plywood board covering up. In addition, each row of finned tubes will be isolated from adjacent with plywood bar to prevent rigid impact during transportation. For all exporting packages, we only use plywood instead of wood for fumigation free purpose.
As a professional supplier, Simcan does not only manufactures products but also has full capability on preparing and submitting documents as listed below but not limited to:
Design and Fabrication Schedule
Drawings and data
Fabrication Procedures including WPS, PQR
Inspection and Test Plan (ITP)
Daily, weekly or monthly progress report
A complete set of final archive including
Raw Material Mill Certificates
Product Conformity Certificate
Inspection Reports including Material Receipt Inspection Report, Test Report etc.
Test report by world reputable third party such as TÜV, BV, SGS, Lloyd's, ABS, Intertek(Moody), Shanghai Jorson etc. if any
Packing List and Proforma Invoice
Certificate of Origin or any other documentation mandatory for clients’ customs clearance or tax preference
Simcan's finned tubes are generally installed in the convection sections and boilers, heat exchangers involving the transfer of heat from a hot fluid to a colder fluid through a tube wall.
|Convection section-Finned Tubes||Steam Superheater-Convection section-Finned Tubes|
|Air Prehater-Finned Tubes||Heat Exchanger-Finned Tubes|
|PVE Gloves Production Line-Solid Finned Tubes||Vegetable Greenhouses-Serrated Finned Tubes|