Finned Tube Bundle for Air Cooler | ASME SA179 with Al1060 G-Type Fins

Yuhong Group Co., Ltd. engineers and supplies complete finned tube bundles for air-cooled heat exchangers (ACHEs), alongside shell & tube heat exchangers, pressure vessels, and replacement components including U-tubes, finned tubes, tubesheets, baffles, and heads. All products are fabricated under ASME U-Stamp certification and comply with API 661, PED, and international classification society requirements.

The finned tube bundle is the core heat exchange component of an air cooler. This bundle features ASME SA179 seamless low-carbon steel tubes as the base carrier, with Al1060 aluminum fins mechanically embedded via G-type (embedded) finning technology. The G-type process involves precision-machining helical grooves on the tube outer surface, then cold-working aluminum strip into the grooves under tension to create a permanent, near-zero-contact-resistance bond. This design delivers 5-10× the heat transfer surface area of bare tubes while maintaining mechanical integrity at elevated service temperatures.

• Tensile Strength: ≥ 325 MPa
• Yield Strength: ≥ 180 MPa
• Elongation: ≥ 35%
• Hardness: ≤ 72 HRB
• Chemical composition: C 0.06-0.18%, Mn 0.27-0.63%, P ≤ 0.035%, S ≤ 0.035%

• Tensile Strength: ≥ 90 MPa
• Yield Strength: ≥ 35 MPa
• Elongation: ≥ 25%
• Thermal conductivity: ~237 W/m*K
• Max continuous operating temperature: 285°C (545°F)

All finned tube bundles undergo inspection and testing in accordance with ASME Code requirements and API 661 guidelines:

Finned tube bundles with ASME SA179 base tubes and Al1060 G-type fins are specified for air-cooled heat exchanger service across multiple industries:

• Petroleum Refining: Hydrocarbon process cooling, overhead condensers, and intercoolers
• Petrochemical & Chemical Plants: Reactor cooling, gas compression interstage cooling
• Oil & Gas Production: Natural gas coolers, compressor coolers, dehydration unit reboilers
• Power Generation: Turbine exhaust condensers, auxiliary cooling systems
• Dry Air Cooling Applications: Water-scarce regions and remote locations where cooling water is unavailable or cost-prohibitive

G-type embedded fins expand the effective heat transfer area by 5-8× compared to bare tubes. The mechanical embedding process ensures consistent fin-to-tube contact across the full operating temperature range, maintaining thermal efficiency without the degradation seen in adhesive-bonded or welded fin designs.

• Operating temperature range: -40°C to +400°C
• The embedded G-fin design resists vibration loosening—critical for compressor coolers and fan-induced vibration environments
• Al1060 fins provide natural oxidation resistance in atmospheric service

• Tube diameters: 16-63 mm (custom sizes available)
• Fin pitch: 2.1-5 mm (adjustable per thermal duty requirements)
• Bundle configurations: forced draft or induced draft
• Tube layout: in-line or staggered
• Header designs: plug-type or removable cover for cleaning access
• Coatings: anodized aluminum fins or epoxy-coated carbon steel components for aggressive environments

A: The maximum continuous fin base temperature is approximately 285°C (545°F). The G-type embedded design allows tube wall temperatures up to 400°C, but the aluminum fin material limits the fin tip temperature to avoid softening.

A: G-type (embedded) fins offer superior mechanical retention and thermal contact at elevated temperatures compared to L-type (wrapped) fins. Extruded fins provide the highest mechanical bond but are typically limited to aluminum base tubes. G-type is the preferred choice for carbon steel tubes in high-temperature air cooler applications.

A: Yes. Replacement bundles are fabricated to match existing header dimensions, tube layout, and overall envelope, allowing drop-in replacement without structural modifications.

A: Standard NDT includes eddy current testing of each tube, hydrostatic testing of the assembled bundle, and dimensional verification. Additional testing (radiographic, ultrasonic) can be specified per project requirements.