ASTM A249 TP304L L Type Finned Tube With AL1060 Fins For Waste Heat Recovery Units

ASTM A249 TP304L L-Type Finned Tube with AL1060 Fins is a specialized heat exchanger component designed for efficient heat transfer in various industrial applications. Here's a detailed breakdown:

1. Base Tube: ASTM A249 TP304L

Material: Stainless Steel 304L (low carbon variant, ≤0.03% carbon).

Standard: ASTM A249 specifies seamless and welded austenitic steel tubes for boilers, heat exchangers, and condensers.

(1). Chemical Composition (Weight %)

The composition complies with ASTM A249/A249M and ASTM A312/A312M (for seamless/welded pipes).

Key Notes:

Low Carbon (≤0.035%): Reduces carbide precipitation during welding, improving corrosion resistance in welded structures (hence "L" grade).

Molybdenum (2-3%): Enhances resistance to pitting and crevice corrosion, especially in chloride environments (e.g., seawater, chemical processing).

(2). Mechanical Properties (ASTM A249)

Additional Notes:

Heat Treatment: Solution annealed at 1010–1120°C (1850–2050°F) followed by rapid cooling (quenching) to maintain corrosion resistance.

Impact Toughness: Excellent at cryogenic temperatures due to austenitic structure.

Weldability: Excellent (no post-weld heat treatment required).

2. L-Type Finned Tube

Fin Type: "L-Type" refers to fins that are embedded or wound into a groove on the tube's outer surface, ensuring strong mechanical bonding.

Advantages:

• Enhanced heat transfer efficiency due to increased surface area.
• Robust fin-to-tube contact, reducing thermal resistance.

3. AL1060 Fins

Material: Aluminum 1060 (99.6% pure aluminum).

Properties:

• High thermal conductivity (~235 W/m·K), ideal for heat dissipation.
• Lightweight, corrosion-resistant, and cost-effective.
• Soft and malleable, making it easy to form into fins.

4. Key Features or Benifits

✅ Corrosion Resistance: TP304L (internal) + AL1060 (external) combo suits harsh environments.
✅ Thermal Efficiency: Aluminum fins (235 W/m·K) enhance heat transfer vs. steel fins.
✅ Cost-Effective: Cheaper than all-stainless-steel finned tubes while maintaining performance.
✅ Durable Bonding: L-Type fins resist vibration/thermal expansion loosening.

5. Why This Combination?

Cost-Effectiveness: Aluminum fins are cheaper than stainless steel while providing superior thermal performance.

Durability: TP304L resists oxidation and pitting, while AL1060 forms a protective oxide layer.

The ASTM A249 TP304L L-Type Finned Tube with AL1060 Fins is a high-efficiency heat transfer component widely used in industries where corrosion resistance, thermal performance, and durability are critical. Below are its key applications:

1. Air-Cooled Heat Exchangers (ACHEs)

• Power Plants: Cooling steam condensers, turbine exhausts, and auxiliary systems.
• Oil & Gas: Cooling process fluids (e.g., hydrocarbons, natural gas) in refineries and petrochemical plants.
• HVAC Systems: Used in large industrial chillers and air handlers.

2. Waste Heat Recovery Systems

• Cement & Steel Plants: Recovers heat from exhaust gases to preheat combustion air.
• Chemical Processing: Recovers energy from hot flue gases or process streams.

3. Refrigeration & Condensers

• Ammonia/CO₂ Refrigeration: Used in cold storage, food processing, and industrial cooling.
• Evaporative Condensers: Enhances heat rejection in cooling towers.

4. Industrial Boilers & Economizers

• Heat Recovery Steam Generators (HRSGs): Recovers waste heat from gas turbines.
• Boiler Exhaust Gas Cooling: Lowers flue gas temperatures before emission treatment.

5. Marine & Offshore Applications

• Seawater Cooling Systems: Used in ship engines and offshore platforms.
• Desalination Plants: Preheats feedwater in multi-stage flash (MSF) or MED systems.

6. Renewable Energy Systems

• Geothermal Power Plants: Transfers heat from geothermal brine.
• Biomass Boilers: Recovers heat from combustion gases.