Longitudinal Finned Tube Suppliers in China
What Is The Longitudinal Finned Tubes?
Longitudinal Finned Tubes are produced by resistance welding the fins on the base tube in the longitudinal direction along the length of the tube. Welded Longitudinal Finned Tubes are created through resistance welding of fins along the length of the tube. Initially, the fin strip is shaped into a U-channel, with each leg of the U serving as a fin. The channels are then cut to the desired length and positioned longitudinally along the tube before being resistance welded in place. These channels are welded in pairs, positioned diametrically opposite one another, meaning that the specified number of fins must always be a multiple of four.
How The Longitudinal Finned Tubes Manufacturing Process?
1.Firstly form the steel fin strip into a U-shaped channel, then each U channel form as a fin.
2.Then channels are cut to the appropriate length and then oriented along the length of the tube and resistance welded on tube.
3.The channels are welded in pairs, diametrically opposed, therefore the number of fins specified must always be a multiple of four.
4.The longitudinal I/L or U shape fins are welded onto the core plain tubes by resistance welding or welding with filler metal (Spot welded).
Quality control for longitudinal finned tube
The quality of the longitudinal finned tube is assured by hydrostatic or pneumatic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and the outer fins.
Brown fin tubes Delivery condition:
Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with Anti-rust at both ends of brown fin tube.
Longitudinal Finned Tube with two different materials
Core tube material: carbon steel, low alloy steel, stainless steel, brass, copper, copper-nickel alloy, aluminum bronze, nickel alloy.
| 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, |
| 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 |
| Stainless Steel Tubes | TP304/304L, TP316/TP316L TP310/310S TP347/TP347H |
| Copper Tubes | UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 |
| Titanium Tubes | B338 Gr 2 |
Longitudinal finned tubes size:
| Base Tube O.D (mm) | Base Tube Thickness (mm) | Fin Height (mm) | Fin Thickness (mm) | Fin NO.（Pc） |
| 19 mm ~76 mm | 2.0 mm ~6.0 mm | 6.0 mm ~32.0 mm | 0.8 mm ~1.2mm | 4,8,16,24,32,40,48 |
| Base Tube Material | Fin Material | Tube Length (Mtr) | ||
| Carbon Steel ,Alloy Steel ,Stainless Steel | Carbon Steel ,Alloy Steel ,Stainless Steel | ≤ 15Mtrs | ||
Longitudinal Finned Tube Material
The base tube is made of Carbon Steel Tube(A106/A179/A192/A210),the carbon steel fins
The base tube is made of stainless steel tube(ASTM A213 TP304/TP304L ,TP316/TP316L),the carbon steel fins
Brown fin tube,The base tube is made of copper tube,the copper fins(UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10)
Longitudinal finned tube,the base tube is made of alloy steel tube(ASTM A213 T11/T22),the alloy steel fins(ASTM A213 T11/T22)
Longitudinal Finned Tubes By Industy
Longitudinal finned tubes are widely used in many fields. First, in the power industry, longitudinal finned tubes are often used in equipment such as boiler economizers and air preheaters to improve thermal energy utilization. Secondly, in the chemical, petroleum, refrigeration and other industries, longitudinal finned tubes also play an important role, especially in occasions where efficient heat exchange is required. In addition, longitudinal finned tubes also show unique advantages in refrigeration, air conditioning and waste heat recovery systems. Through high-frequency welding technology, its longitudinal fin design greatly increases the heat exchange area and improves the heat exchange efficiency.
Top Features of Longitudinal Finned Tube
Datang offers the widest variety of sizes available for longitudinal finned tubes in the industry.Its heat exchange efficiency can reach several times or even dozens of times that of ordinary heat exchangers.
1.Provide 8 to 12 times the heat transfer area of bare tubes.Are more efficient than bare tubes.
2.Provide smaller exchangers due to increased Heat Transfer area.
3.Often provide a more economical selection.
4.Fins can be “Cut & Twist” to increase shell side fluid turbulence and improve heat transfer.
Customizable Welded Longitudinal Finned Tube
We can customize the material, specification and length according to your requirements.Solve your problems anytime and anywhere. Customize fin tubes and equipment according to your needs. Provide free technical guidance. Welcome to customize with drawings, so that you can purchase without worries.
Longitudinal Finned Tubes Package
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 Longitudinal Finned Tube Quality Checks
Each of our U longitudinal finned tubes is subjected to stringent quality checks.Inspection and Tests Performed:
1.Chemical Composition inspection。
2.Mechanical Properties Test(Tensile Strength, Yield Strength, Elongation, Flaring, Flattening, Hardness, Impact Test).
3.Surface and Dimension Test.
4.No-destructive Test.
5.Hydrostatic Test.
Longitudinal Finned Tube Application
Longitudinal finned tubes for boiler economizers are a highly efficient heat exchange element, mainly used to recover waste heat in flue gas, reduce exhaust gas temperature, and improve boiler efficiency. Its working principle is to install finned tubes in the flue gas channel to increase the contact area between the flue gas and the tube wall, thereby improving the heat exchange efficiency. This design is particularly suitable for heat recovery from low-temperature flue gas, which can effectively reduce energy waste and operating costs.
Welded Longitudinal finned tubes for heat exchangers is a high-efficiency heat exchange element. By processing fins of a certain shape and spacing along the axial direction on the surface of the base tube, the heat exchange area is significantly increased and the heat transfer efficiency is optimized.
Longitudinal finned structures are commonly used in shell and tube applications, such as in double-tube and multi-tube heat exchangers, where the longitudinally finned tubes are telescoping within the holes of a larger tube shell. Heat is transferred between the fluid flowing through the finned tube holes and the fluid flowing through the housing holes. Fluid flowing through the housing holes is forced to flow between the longitudinal fins. In this case, the helical fins would block the flow of fluid rather than allow fluid to flow between the fins.
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Longitudinal Finned Tube FAQs
A: Longitudinal finned tube production line 2.
A: We can provide welded Longitudinal finned tube samples for free.
A: After you confirm U longitudinal finned tubes sample details, the samples will be ready for delivery in 3-7days,and will be sent to you via express and arrive in 3-5days.
A: Longitudinal finned tube can be customized, we can make the new thermoforming or extruding mode based on your drawings and we can sign a confidentiality agreement about your patented product, pls contact us for any further information.
A: Always a pre-production sample,before mass production;always final inspection before shipment.
Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.