T-Type Longitudinal Fin Tubes are finned tubes in which the fins run parallel to the tube axis from one end of the finned section to the other. The fin strip is formed into a U-channel and joined to the base tube by resistance welding. The fins are normally arranged in diametrically opposed pairs, with four longitudinal fins being a common arrangement. Depending on pressure, temperature, and corrosion demands, carbon steel, stainless steel, or duplex stainless steel can be used to create T-type tubes with longitudinal fins. The type of metal fin to be used should be chosen based on a heat exchanger's design, which also allows for fin height, fin thickness, tube wall thickness, and overall tube length specifications.
Amardeep Steel Centre has been producing, exporting, and dispatching specialty tubes since the year 1982 and has today delivered various kinds of tubing to more than 40 nations.
Technical Data
Specifications of T Type Longitudinal Fin Tubes
| Parameter | Specification |
|---|---|
Fin Type | T Type, longitudinal, resistance welded |
Base Tube Materials | Carbon steel A106, A179, A192, A210; stainless steel TP304, TP316, TP321, TP310S; duplex stainless steel 2205 |
Fin Materials | Carbon steel or stainless steel, selected to suit the application |
Number of Fins | Four fins per tube is a common arrangement, installed in diametrically opposed pairs |
Base Tube Outside Diameter | 25 mm to 219 mm |
Fin Height | 12 mm to 50 mm |
Fin Thickness | 2 mm to 4 mm |
Tube Orientation | Horizontal or vertical |
Manufacturing Method | U channel forming followed by resistance welding |
Length | Cut length according to drawing or project requirement |
Documentation | Material Test Certificate available with the order |
Longitudinal T-Type Finned Tubes Chemical Composition
The following values represent selected base tube grades that can be used for T-type longitudinal fin tubes. The applicable material standard and the Mill Test Certificate should always be used for final procurement verification.
| Grade | Carbon C | Manganese Mn | Chromium Cr | Nickel Ni | Molybdenum Mo |
|---|---|---|---|---|---|
ASTM A179 | 0.06 to 0.18% | 0.27 to 0.63% | Not specified | Not specified | Not specified |
ASTM A106 Grade B | 0.30% max | 0.29 to 1.06% | 0.40% max | 0.40% max | 0.15% max |
ASTM TP304 | 0.08% max | 2.00% max | 18.00 to 20.00% | 8.00 to 11.00% | Not specified |
ASTM TP316 | 0.08% max | 2.00% max | 16.00 to 18.00% | 10.00 to 14.00% | 2.00 to 3.00% |
Duplex 2205, UNS S32205 | 0.030% max | 2.00% max | 22.00 to 23.00% | 4.50 to 6.50% | 3.00 to 3.50% |
Mechanical Properties of T-Type Longitudinal Finned Tubes
Mechanical properties apply to the base tube grade and should not be treated as independent mechanical ratings for the complete fin assembly.
| Grade | Tensile Strength Minimum | Yield Strength Minimum | Elongation Minimum |
|---|---|---|---|
ASTM A179 | 325 MPa | 180 MPa | 35% |
ASTM A106 Grade B | 415 MPa | 240 MPa | 30% |
ASTM TP304 | 515 MPa | 205 MPa | 35% |
ASTM TP316 | 515 MPa | 205 MPa | 35% |
Duplex 2205, UNS S32205 | 655 MPa | 450 MPa | 25% |
Dimension Chart for T-Type Longitudinal Fin Tubes
| Base Tube Outside Diameter | Fin Height | Fin Thickness |
|---|---|---|
25 mm to 50 mm | 12 mm to 20 mm | 2 mm to 3 mm |
50 mm to 114 mm | 20 mm to 35 mm | 3 mm to 4 mm |
114 mm to 219 mm | 35 mm to 50 mm | 3 mm to 4 mm |
These dimensions are suitable as a general procurement guide. They are not intended to replace a project drawing.
Industrial Applications of Longitudinal T-Type Finned Tubes
T-Type Longitudinal Fin Tubes are used where higher heat transfer surface area is needed without making the equipment unnecessarily large. Common applications include:
- Double pipe heat exchangers: The longitudinal fins fit within the annular space between the inner and outer tubes.
- Multi-pipe heat exchangers: Used where several finned tubes are arranged for compact heat transfer.
- Fired heaters: Suitable for selected process heating duties where reliable heat transfer is required.
- Gas coolers and heaters: Used to improve heat transfer between process gases and heating or cooling media.
- Tank heaters: Provide additional heating surface in tanks and process vessels.
- Chemical and petrochemical plants: Used in process heating, cooling, and heat recovery systems.
- Boiler and heat recovery equipment: Applied where additional heat transfer area is required.
Frequently Asked Questions
What is a T-type longitudinal fin tube?
A T Type Longitudinal Fin Tube has fins running parallel to the tube axis. The fin strip is formed into a U-channel and resistance welded to the base tube.
How does a T-Type Longitudinal Fin Tube differ from a helical fin tube?
T-type longitudinal fin tubes have straight fins running along the tube, while helical fins wrap around it. Longitudinal fins are particularly suitable for tube-in-tube designs.
Why are longitudinal fins preferred for double-pipe heat exchangers?
Longitudinal fins fit naturally inside the annular space between two tubes, providing additional heat transfer area while maintaining continuous flow channels along the tube length.
What is the maximum operating temperature for T-type longitudinal fin tubes?
The temperature limit depends on the tube grade, wall thickness, pressure, and design code. Carbon steel may suit temperatures around 450°C in appropriate designs.
Which materials are available for T Type Longitudinal Fin Tubes?
Common materials include carbon steel, stainless steel, and duplex stainless steel. Grades can include A179, A192, A210, A106, TP304, TP316, TP321, and duplex 2205.
Does Amardeep provide Mill Test Certificates with T-Type Longitudinal Fin Tubes?
Yes. Material Test Certificates can be supplied according to the purchase requirement, covering applicable chemical composition and mechanical test results for the supplied material.
Requesting a Quote for T-Type Longitudinal Fin Tubes
Need a T-type longitudinal fin tube quotation? Send the tube grade, outside diameter, wall thickness, fin height, fin thickness, number of fins, fin length, tube length, operating pressure, and operating temperature.
Request a QuoteRelated Products
Finned Tubes, Finned Tube Heat Exchangers, G Fin Tubes, Helical Serrated Finned Tubes, Stainless Steel Finned Tubes, Carbon Steel Finned Tubes and Duplex Steel Pipes and Tubes.
