Serrated Fin Tube is with cut or serrated steel strip welded on base tube by high frequency welding technique. The cut fin strip with serrated fins is helically wound on edge around the outside surface of the tube and attached to the tube with a continuous fillet weld on one side of the fin. Comparing with solid welded fin tube, the serrated fin tube is with better heat transfer efficiency as the serrated fin is a kind of turbulators and also can prevent ash accumulation on fin.
The effectiveness of bond between tube and serrated fins is the most important features, thus with high efficiency under all conditions of temperature and pressure, ability to withstand high fin side temperatures.
If compared with solid fin tube, the serrated fin tube is better to withstand the fin fouling if there is a problem in application, gives better heat transfer properties.
Base Tube Material | CS (A106, A333, A179, A210, P5, P11, P22) |
SS (SS304, SS316, Duplex SS2205, Super Duplex SS32750) | |
Nickel Alloys (825, Inconel Alloy 625, High chrome high nickle incoloy alloy Monel 400) | |
Tube OD | 15.88mm~273mm or customized |
Tube Wall Thick | 2~28.6mm |
Length | 1Meters to 28Meters (92feet) |
Fin Material | CS (08F, SPCC) |
SS (SS304, SS316, 409, 410, 321, 347) | |
Fin Height | 8~35mm |
Fin Thick | 1~1.5mm |
Fin Pitch | 3~333FPM (1FPI ~7FPI) |
Fin Type | Solid, U Type, S Type, Serrated |
Finned tube welding rate | more than 98% |
Tube Ends | Plain cut or beveled at any degree |
Totally we have four production lines to produce high frequency fin tubes, two machines were imported from Korea and can produce fin tube maximum to OD219mm and 28000mm length.
The serrated fin tube can be in straight length or with ends welded to customized shape.
When an order of serrated fin tube finished, we will have macro graphic test on each fin tube to see welding rate and make sure all fin tubes are qualified before delivery.
Package
Tube ends straight cut or beveled, ends with plastic cap covered
Sea worthy package for transportation free from damage.
Characteristics
Large heat exchange area
Corrosion resistance, abrasion resistance, low contact thermal resistance, high stability and anti ash ability.
Because of fast welding speed and strong self cooling effect of weld ments, not only the heat affected zone is small, but also oxidation is not easy to occur, so the micro structure and properties of the weld are very good.
Application
The high frequency welded solid fin tubes are widely usd in heat recovery of boiler, air preheaters and waste heat boilers, as well as heat exchangers in various fields.
HF Solid fin tube is widely applied in waste heat recovery of electric power, cement industry and petrochemical industry.
The high frequency welded spiral fin tube economizer is a newly type heat transfer equipment, consisting of spiral fin tubes to overcome the serious abrasion and short service time.
To avoid any mistanderstanding on your enquiry, we request you to provide the following datas.
Core Tube (Base Tube) Material and Quantity
Base Tube OD * tube wall thick * length
Fin Type and Fin Material
Fin Dimensions: Fin OD * Fin Thick * Fin Pitch * Unfinned Length at two sides
Serrated fin details such as serrate numbers, serrate depth and width
Tube ends with straight plain cut or with beveled.
