Welded Helical Serrated Fin Tubes for Heat Exchanger
Serrated finned tube is a type of heat exchanger that is designed to enhance the heat transfer rate by increasing the surface area of the tube.
Serrated Finned Tube is a high-frequency welding production process with high-frequency patented technology. Using high-frequency power supply as a heat source, the steel strip and steel pipe are heated at the same time.
Serrated Finned Tube For Heat Exchanger
Serrated Finned Tube is a high-frequency welding production process with high-frequency patented technology. Using high-frequency power supply as a heat source, the steel strip and steel pipe are heated at the same time, so that they can be welded together. It has the characteristics of long life, wide temperature range and high pressure tolerance.
Serrated Finned Tube is a high-frequency welding production process with high-frequency patented technology. Using high-frequency power supply as a heat source, the steel strip and steel pipe are heated at the same time, so that they can be welded together. It has the characteristics of long life, wide temperature range and high pressure tolerance.
The serrations are small grooves or notches that are cut into the fin surface, which disrupt the boundary layer and increase the turbulence of the fluid flowing over the fins. This increased turbulence enhances the convective heat transfer between the tube and the fluid, resulting in a more efficient heat exchanger. Serrated finned tubes are commonly used in applications where high thermal performance is required, such as in boilers, air-cooled condensers, and other heat exchangers.
Additional Info
Payment Terms:T/T, LC
Delivery: 15-30 days after payment
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Iron frame packing boxes and the desiccants are put into each package for continental transportation as well. or as required.
Welded Helical Serrated Fin Tubes Manufacturing Process:
Serrated Finned Tube use high-frequency welding production process, using high-frequency power source as heat source, to heat steel strip and steel pipe at the same time, so that they can be welded together into one
1. U-bends with longitudinal fins and fin coils are available on request.
2. Longitudinal fin types: one piece, standard U-bend, cut and twisted, perforated, etc...
3. The fin channels are welded to the tube in pairs. The fin height, number of fins, and fin thickness can be specified.
4. Fins can be used for OD pipe or NB pipe.
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Carbon Steel Tubes |
A179, A192, SA210 Gr A1/C, A106 Gr B, A333 Gr3 Gr6 Gr8, A334 Gr3 Gr6 Gr8, 09CrCuSb, DIN 17175 St35.8 St45.8, EN 10216 P195 P235 P265, GB/T3087 Gr10 Gr20, GB/T5310 20G 20MnG, |
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Alloy Steel Tubes |
A209 T1 T1a,A213 T2 T5 T9 T11 T12 T22 T91,A335 P2 P5 P9 P11 P12 P22 P91,EN 10216-2 13CrMo4-5 10CrMo9-10 15NiCuMoNb5-6-4 |
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Stainless Steel Tubes |
TP304/304L, TP316/TP316L TP310/310S TP347/TP347H |
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Copper Tubes |
UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 |
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Titanium Tubes |
B338 Gr 2 |
Serrated Finned Tube is combined with two different materials
Core tube material: carbon steel, low alloy steel, stainless steel, brass, copper, copper-nickel alloy, aluminum bronze, nickel alloy.
Serrated Fin Tubes Features
High Fin Stability: Ensures fins remain securely attached under various conditions.
Superior Heat Transfer Efficiency: Enhanced performance due to serrated fins.
Elevated Operating Temperature Capability: Suitable for high-temperature applications.
Exceptional Thermal Shock Resistance: Can withstand rapid temperature changes.
Fin tube
Welded Helical Serrated Fin Tubes Manufacturing Process
The production of high-frequency welded serrated finned tubes involves:
Groove Creation: Preparing the bare tube and welding the fin strip in a spiral fashion.
High-Frequency Resistance Welding: Using high-frequency electrical resistance to ensure a strong bond.
Serrated Fin Configuration: Introducing cuts into the fin strip to enhance fluid flow and turbulence.
Helical Serrated Fin Tubes Inspections
Chemical Composition Analysis: Ensures material meets standards.
Dimensional Inspection: Confirms dimensions are within tolerances.
Mechanical Property Testing: Includes tensile strength, yield strength, and more.
Surface Quality Inspection: Detects defects affecting performance.
Flatten Test & Expansion Test: Evaluates deformation resistance.
Non-destructive Testing: Uses UT, RT, MT, or PT for defect detection.
Hydrostatic Test: Ensures tubes ability to withstand internal pressure.
Welded Helical Serrated Fin Tubes Applications
These tubes are essential in various industrial applications, including:
Economizers: Improving boiler efficiency by preheating feedwater.
Heat Recovery Boilers: Enhancing energy efficiency by recovering waste heat.
Heat Exchangers: Suitable for oil refineries, petrochemical industries, and power plants.
Natural Gas Combustion: Efficient heat transfer and reduced fouling.
Benefits of Serrated Fins
Enhanced Heat Transfer: Promotes fluid flow and turbulence, improving efficiency.
Compact Design: Allows for a more compact layout, reducing volume and footprint.
Efficient in High-Temperature and Pressure Applications: Durable and resistant to operational stresses.
Serrated Fin Tubes Advantages
1.Transferring heat from a hot fluid into a colder fluid through a tube wall is the reason many of us use finned tubes.
2.But you may ask, what is the major advantage of using a finned tube? Why can’t you just use a regular tube to make this transfer? Well you can but the rate will be much slower.
3.By not using a finned tube the outside surface area is not significantly greater than the inside surface area. Because of that, the fluid with the lowest heat transfer coefficient will dictate the overall heat transfer rate. When the heat transfer coefficient of the fluid inside the tube is several times larger than that of the fluid outside the tube the overall heat transfer rate can be greatly improved by increasing the outside surface area of the tube.
4.Finned tubes increase outside the surface area. By having a finned tube in place, it increases the overall heat transfer rate. This then decreases the total number of tubes required for a given application which then also reduces overall equipment size and can in the long-run decrease the cost of the project. In many application cases, one finned tube replaces six or more bare tubes at less than 1/3 the cost and 1/4 the volume.
5.For applications that involve the transfer of heat from a hot fluid to a colder fluid through a tube wall, fin tubes are used. Usually, for an air heat exchanger, where one of the fluids is air or some other gas, the air side heat transfer coefficient will be much lower, so additional heat transfer surface area or a fin tube exchanger is very useful. The overall pattern flow of a finned tube exchanger is often crossflow, however, it can also be parallel flow or counterflow.
6.Fins are used to increase the effective surface area of heat exchanger tubing. Furthermore, finned tubes are used when the heat transfer coefficient on the outside of the tubes is appreciably lower than that on the inside. In other words, heat transferred from liquid to gas, vapor to gas, such as steam to air heat exchanger, and thermic fluid to air heat exchanger.
7.The rate at which such heat transfer can occur depends on three factors – [1] the temperature difference between the two fluids; [2] the heat transfer coefficient between each of the fluids and the tube wall; and [3] the surface area to which each fluid is exposed.
