L-Foot Finned Tube ASTM A179 With Al-1060 Fins For Air-Cooled Condensers
An L-Type Finned Tube is a type of extended surface heat exchanger tube designed to improve heat transfer efficiency. It features fins that are helically wound (L-shaped) and attached to the outer surface of the base tube, increasing the surface area for better thermal performance.
Key Features of L-Type Finned Tubes:
The fins are embedded into a groove on the tube's outer surface and then tightly rolled to form a secure mechanical bond (no welding or brazing required).
The "L" shape refers to the fin's cross-section, where the base of the fin is locked into the groove.
Base Tube: Carbon steel, stainless steel, copper, or other alloys.
Fins: Typically aluminum, copper, or steel.
High thermal efficiency due to increased surface area.
Strong mechanical bond resistant to thermal cycling and vibration.
Cost-effective compared to welded or extruded fin tubes.
Good corrosion resistance (especially with aluminum fins).
- Comparison with Other Finned Tubes:
L-Type vs. Embedded (G-Type): L-Type has better fin retention under thermal stress.
L-Type vs. Welded Fins: No welding means lower risk of thermal distortion.
L-Type vs. Extruded Fins: More economical but slightly less efficient than extruded fins.
L-Type finned tubes are widely used where durability, efficiency, and cost-effectiveness are critical. Let me know if you need more details!
Base Tube Material: ASTM A179
Material: Low-carbon steel (seamless cold-drawn tubes)
ASTM A179 Material Composition (Weight %)
| Element | Composition Range |
| Carbon (C) | ≤ 0.06 - 0.18% |
| Manganese (Mn) | 0.27 - 0.63% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
| Silicon (Si) | ≥ 0.10% (typically 0.25-0.50%) |
| Iron (Fe) | Balance (≥ 98%) |
Notes:
Low carbon content improves weldability and reduces brittleness.
Minimal impurities (P, S) enhance corrosion resistance.
ASTM A179 Mechanical Properties
| Property | Value |
| Tensile Strength | ≥ 325 MPa (47,000 psi) |
| Yield Strength | ≥ 180 MPa (26,000 psi) |
| Elongation (in 2") | ≥ 35% |
| Hardness (Rockwell B) | ≤ 72 HRB |
Key Characteristics:
- Cold-drawn seamless tubes: Improved surface finish and dimensional accuracy.
- High ductility (≥35% elongation) for bending/flaring without cracking.
- Moderate strength: Suitable for low/medium-pressure heat exchangers.
Key Advanteages:
- Good thermal conductivity
- Corrosion resistance in certain environments
- Suitable for moderate-temperature applications (e.g., boilers, condensers, heat exchangers)
The A179 L-Type Finned Tube is a specialized heat exchanger component primarily used in applications requiring efficient heat transfer in low-pressure or corrosive environments. Here are its key applications:
1. Heat Exchangers in HVAC & Refrigeration Systems
Used in air-cooled condensers, evaporators, and chillers due to its good thermal conductivity and corrosion resistance.
Suitable for low-pressure steam or refrigerant applications.
2. Power Plants & Boilers
Employed in economizers, feedwater heaters, and waste heat recovery systems to improve thermal efficiency.
The L-Type fin design (embedded fin) ensures strong mechanical bonding, making it durable under thermal cycling.
3. Petrochemical & Oil Refining Industries
Used in heat recovery units, gas coolers, and process heaters where corrosion resistance (due to carbon steel or alloy coatings) is crucial.
Effective in condensing applications where finned surfaces enhance heat transfer.
4. Industrial Drying & Process Heating
Applied in dryers, kilns, and industrial ovens where uniform heat distribution is needed.
The finned structure increases surface area, improving heat exchange efficiency.
5. Marine & Offshore Applications
Used in seawater-cooled condensers and desalination plants due to its resistance to fouling and corrosion (especially if made from corrosion-resistant materials like A179 carbon steel).
Key Advantages of A179 L-Type Finned Tube:
- High thermal efficiency (L-Type fins provide excellent heat transfer).
- Strong mechanical bond (fins are tightly wrapped and embedded into the base tube).
- Corrosion-resistant (A179 steel is often galvanized or coated for harsh environments).
- Cost-effective compared to high-alloy finned tubes.
Conclusion:
The A179 L-Type Finned Tube is ideal for industries requiring efficient heat transfer in moderate to corrosive environments, particularly in HVAC, power generation, petrochemicals, and industrial heating systems. Its durability and thermal performance make it a preferred choice for many heat exchange applications.
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L-Footed Finned Tube ASTM A179 With Al1060 Fins For Air-Cooled Condensers Images
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