ASTM A335 P22 Solid Finned Tube With 11-13Cr Fins For Refineries and Petrochemical

ASTM A335 P22 HFW Solid Finned Tube with 11-13Cr Fins is a specialized type of heat exchanger tube designed for high-temperature and high-pressure applications. Here's a breakdown of its components and features:

1. Base Tube: ASTM A335 P22

(1). Chemical Composition of ASTM A335 P22 (Weight %)

Notes:

Small amounts of residual elements (Cu, Ni, etc.) may be present but are not specified.

The Cr-Mo alloy provides high-temperature strength and oxidation resistance.

(2). Mechanical Properties of ASTM A335 P22

Additional Notes:

Heat Treatment: P22 tubes are typically supplied in normalized and tempered condition for optimal mechanical properties.

Impact Testing: Required for certain applications (e.g., ASME Boiler & Pressure Vessel Code).

High-Temperature Performance: Retains strength up to 593°C (1100°F).

2. Manufacturing Process: HFW (High-Frequency Welded

• The tube is manufactured using High-Frequency Welding (HFW), a process that ensures a strong, consistent weld seam.
• HFW tubes are cost-effective compared to seamless tubes while maintaining good mechanical properties.

3. Finned Tube Design: Solid Fins with 11-13% Chromium (Cr)

    Fin Type: Solid fins (as opposed to serrated or embedded fins) for better durability.

    Fin Material: 11-13% Chromium steel, offering:

• High corrosion resistance (especially against oxidation at elevated temperatures).
• Good heat transfer efficiency due to the finned surface area.
• Fin Attachment: Fins are typically welded or integrally formed onto the base tube.

4. Key Advantages

• Enhanced Heat Transfer: Fins increase the surface area, improving thermal efficiency.
• High-Temperature Performance: P22 base material + Cr-rich fins resist oxidation and creep.
• Cost-Effective: HFW manufacturing reduces costs compared to seamless alternatives.

5. Comparison with Other Fin Types

• 11-13Cr Fins vs. Low-Alloy Steel Fins: Better oxidation resistance at high temperatures.
• Solid Fins vs. Serrated Fins: More durable but may have slightly lower heat transfer efficiency than serrated fins in some cases.

The ASTM A335 P22 HFW (High-Frequency Welded) Solid Finned Tube with 11-13% Chromium (Cr) Fins is designed for high-temperature, high-pressure, and corrosive environments where efficient heat transfer and durability are critical. Below are its key applications:

1. Power Generation (Boilers & Heat Recovery Systems)

• Superheaters & Reheaters:
  • Used in coal-fired, gas-fired, and biomass power plants to increase steam temperature efficiently.
  • The 11-13Cr fins resist oxidation and flue gas corrosion at high temps (up to 600°C+).
• Economizers:
  • Recovers waste heat from exhaust gases to preheat boiler feedwater.
  • HFW P22 base tube handles high-pressure steam/water cycles.
• Heat Recovery Steam Generators (HRSGs):
  • Captures heat from gas turbine exhaust to produce steam for additional power generation.

2. Petrochemical & Oil Refining

• Fired Heaters & Process Furnaces:
  • Transfers heat to hydrocarbons in cracking units (e.g., ethylene production).
  • Cr-Mo P22 base material resists sulfidation (sulfur attack) in refinery environments.
• Catalytic Reforming Units:
  • Withstands hydrogen-rich atmospheres (resistant to hydrogen embrittlement).

3. Chemical Processing

• High-Temperature Reactors:
  • Used in ammonia, methanol, and sulfuric acid production.
• Waste Heat Boilers:
  • Recovers energy from exothermic reactions.

4. Waste Incineration & Biomass Plants

• Corrosive Flue Gas Handling:
  • The 11-13Cr fins resist chlorine/sulfur compounds from burning waste or biomass.
• Air Preheaters:
  • Improves combustion efficiency by preheating intake air with exhaust heat.

Key Industries & Use Cases

Conclusion

This finned tube is ideal for high-temperature, high-pressure environments where corrosion resistance and heat transfer efficiency are critical. The combination of P22 alloy steel base tube and 11-13Cr fins ensures long-term performance in demanding industrial applications.