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Extruded Serrated Type Finned Tube

2021-10-13Leave a message

Extruded Serrated Finned Tubes

What Are Extruded Serrated Finned Tubes?

Extruded serrated finned tubes represent an advanced heat transfer technology that combines two manufacturing processes to create superior thermal performance. These specialized tubes begin as extruded finned tubes, where a thin metal strip is mechanically bonded to a base tube under high pressure. The fins are then precision-machined to create a serrated pattern, dramatically increasing the surface area and creating turbulence in fluid flow.

Key Innovation: The serrated fin design disrupts boundary layer formation, significantly enhancing heat transfer coefficients compared to smooth fin designs.

Manufacturing Process

1
Base tube preparation and cleaning to ensure optimal bonding surface
2
High-pressure extrusion of fin material onto base tube
3
Precision machining of serrations into the fin surface
4
Quality inspection and performance testing

Why Choose Extruded Serrated Finned Tubes?

These advanced heat transfer components offer up to 40% better thermal performance compared to standard finned tubes. The unique combination of extrusion bonding and serrated fin design creates optimal conditions for heat exchange in demanding industrial applications.

Technical Advantages & Performance Benefits

Enhanced Heat Transfer

Serrated fins increase turbulence, breaking thermal boundary layers and improving heat transfer coefficients by 25-40% compared to smooth fins.

Superior Bond Strength

Extrusion process creates metallurgical bond with tensile strength exceeding 140 MPa, ensuring reliability in thermal cycling applications.

Reduced Fouling

Serrated design minimizes particulate buildup and maintains performance in dirty service conditions.

Material Flexibility

Compatible with various base tube and fin materials including carbon steel, stainless steel, copper, and aluminum alloys.

Standard Specifications & Typical Sizes

Extruded serrated finned tubes are available in various configurations to meet specific application requirements:

Base Tube OD: 15-50 mm
Fin Height: 8-20 mm
Fin Thickness: 0.3-0.8 mm
Fin Pitch: 200-500 FPM
Serration Depth: 1-3 mm
Maximum Length: 18 meters

Detailed Technical Specifications

Parameter Standard Range ASME SA179 Example Material Options
Base Tube Material Carbon Steel, Stainless Steel, Copper Alloys ASME SA179 Various grades available
Fin Material Aluminum, Copper, Carbon Steel SB209 1060 Custom alloys possible
Tube Length Up to 18,000 mm 9,144 mm Custom lengths available
Fin Length Custom to application 9,044 mm Precision cut
Base Tube OD 15-50 mm 25.4 mm Standard & custom sizes
Tube Wall Thickness 1.5-4.0 mm 3.404 mm Pressure dependent
Fin Height 8-20 mm 15.88 mm Optimized for performance
Fin Thickness 0.3-0.8 mm 0.4 mm Balance strength & performance
Fin Pitch 200-500 FPM 394 FPM Application specific
Technical Note: ASME SA179 covers seamless cold-drawn low-carbon steel tubes specifically designed for heat exchangers, condensers, and similar heat transfer equipment with precise wall thickness control.
SA179 extruded and serrated finned tubes
Close-up view of serrated fin pattern
Extruded serrated finned tubes in heat exchanger assembly
Typical heat exchanger application
Extrusion process of serrated finned tubes
Advanced manufacturing process

Industrial Applications

Extruded serrated finned tubes excel in applications requiring high heat transfer efficiency in challenging environments:

Air-Cooled Heat Exchangers
Process Heaters & Boilers
Waste Heat Recovery Systems
Power Generation Condensers
Refrigeration & AC Systems
Chemical Process Equipment
Oil & Gas Processing
Marine Heat Exchangers

Performance Comparison

Fin Type Heat Transfer Coefficient Pressure Drop Fouling Resistance Typical Applications
Extruded Serrated Excellent (40% better than smooth) Moderate High High-performance heat exchangers
Smooth Finned Good Low Moderate Standard applications
Wrapped Finned Fair Low Low Low-temperature applications
Studded Good High High Abrasive environments

Enhanced Technical Options

Customize your extruded serrated finned tubes with these advanced options:

Corrosion-resistant coatings for harsh environments
Variable fin density along tube length
Special serration patterns for specific flow regimes
Integral turbulators for enhanced performance
Non-standard materials for extreme temperatures
Protective end caps and custom fittings

Selection Guidelines & Best Practices

When specifying extruded serrated finned tubes, consider these critical factors:

Material Compatibility: Ensure fin and tube materials are compatible with process fluids and operating temperatures to prevent galvanic corrosion.
Flow Conditions: Serrated fins perform best in cross-flow applications with moderate to high fluid velocities.
Temperature Ranges: Consider thermal expansion differences between fin and tube materials, especially in high-temperature cycling applications.
Maintenance Access: Design for adequate cleaning access if fouling is anticipated in your application.