Heat Exchanger Serrated Finned Tubes ASTM A312 TP304H Base Tube And SS304H Fins
ASTM A312 covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.Welded (WLD) pipe shall be made using an automatic welding process with no addition of filler metal during the welding process.
Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for high-temperature service.
Chemical Composition (%)
| Grade | C | Mn | P | S | Si | Cr |
| S30409 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.00-20.00 |
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| 75ksi (515 MPa) | 30ksi (205 MPa) |
| S30409 | Elongation min. % | Heat Treating Temperature min. |
| 35% | 1900°F [1040°C] |
Serrated spiral fin tubes are important parts to enhance the efficiency of heat transfer, the combination of serrated fins and spiral configurations maximizes heat transfer while maintaining structural integrity.This design helps in improving the heat transfer rate between the fluid inside the tube and the surrounding environment.
Tube and fin materials may be carbon, stainless steel, copper, ferritic alloy or austenitic alloy steel and can be of similar or dissimilar material combinations.The choice of material depends on the specific application requirements, such as corrosion resistance, thermal conductivity, and mechanical strength.The fin strip is cut or serrated at equally spaced intervals, fins are attached to the tube using high-frequency welding techniques, ensuring strong and durable connections while minimizing thermal distortion.The serrations can be in various shapes, such as U-shaped or V-shaped, which help in disrupting the boundary layer and promoting turbulent flow, thereby enhancing heat transfer efficiency.
Serrated finned tubes are used in various industries where efficient heat transfer is crucial. This includes applications in boilers, heat exchangers, air preheaters, and waste heat recovery systems. They are particularly useful in environments with high temperatures and corrosive atmospheres.
*Heat exchangers, boilers, furnaces and refineries: Ideal for use in various types of heat exchangers, including oil coolers, condensers, and evaporators.
*Power Generation: Commonly used in power plants for efficient heat recovery and steam generation.
*HVAC Systems: Utilized in heating, ventilation, and air conditioning systems to improve energy efficiency.
*Chemical Processing: Employed in reactors and heat exchangers where optimal thermal performance is critical.
Advantages
The fins are serrated,the unique fin shape, creating a larger surface area and promoting turbulent flow, which improves heat exchange efficiency.
Depending on the material used, serrated finned tubes can offer good resistance to corrosion, making them suitable for harsh environments.
The design of the fins helps in reducing wear and tear, thereby increasing the lifespan of the tubes
The installation is simple and economical.It is easy to maintain. After the installation of high frequency welding spiral fin tube, it is no longer necessary to maintain.
Specifications
| Type | Description | Base tube | Fin specification (mm) |
| O.D. (mm) | Fin pitch | Fin height | Fin thick |
| Embedded | G-type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| Extruded | Single metal / Combined metal | 8-51 | 1.6-10 | <17 | 0.2-0.4 |
| Low fin tube / T-type fin tube | 10-38 | 0.6-2 | <1.6 | ~0.3 |
| Bamboo tube / corrugated tube | 16-51 | 8-30 | <2.5 | ~0.3 |
| Wound | L / KL / LL type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type fin tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3-25 | 5-30 | 0.8-3 |
| H/HH type fin tube | 25-63 | 8-30 | <200 | 1.5-3.5 |
| Serrated spiral fin tube | 25-219 | 2-7 | <38.1 | 0.9-2.0 |
| Studed fin tube | 25-219 | 8-30 | 5-35 | φ5-20
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Heat Exchanger Serrated Finned Tubes ASTM A312 TP304H Base Tube And SS304H Fins Images
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