Wound Fin Tube for Air Coolers — ASTM A179
Product Overview
Our wound fin tubes for air coolers, manufactured with ASTM A179 seamless low-carbon steel tubes, are designed to provide efficient air-side heat transfer in air-cooled heat exchangers (ACHE), air-cooled condensers, process air coolers, and other industrial cooling equipment.
The fin strip is helically wound around the outside surface of the base tube to increase the external heat-transfer area while maintaining a compact tube arrangement. The wound-fin construction provides a practical balance between heat-transfer performance, mechanical strength, manufacturing flexibility, and cost.
ASTM A179 is widely selected for the base tube where good thermal conductivity, weldability, and reliable mechanical performance are required in non-corrosive or moderately corrosive heat-transfer services.
Key Features
- Base tube: ASTM A179 / ASME SA179 seamless carbon steel
- Fin type: Helically wound / wrapped fin
- Application: Air coolers, ACHE, air-cooled condensers and process cooling systems
- Manufacturing: Controlled fin winding with consistent fin pitch and contact
- High external surface area for improved air-side heat transfer
- Suitable for forced-draft and induced-draft air cooler configurations
- Fin dimensions can be customized according to thermal and mechanical requirements
- Available with bare, galvanized, painted, or other specified surface protection where applicable
Typical Dimensions
The following dimensions represent commonly manufactured ranges rather than limitations. Final dimensions should be selected according to the thermal design and project specification.
| Item |
Typical Range |
| Base tube OD |
16–63.5 mm |
| Base tube wall thickness |
1.5–6.0 mm |
| Tube length |
Up to approximately 18 m, subject to transportation and equipment requirements |
| Fin height |
5–25 mm |
| Fin thickness |
0.3–1.2 mm |
| Fin pitch |
2.0–12 mm |
| Fin material |
Carbon steel, aluminum, stainless steel or specified alloy |
| Fin type |
Helically wound / wrapped |
| Fin coverage |
Continuous or specified spacing |
Common base-tube sizes can be supplied according to customer drawings, heat-transfer calculations, or applicable project standards.
Manufacturing Process
- ASTM A179 seamless tube preparation — Tubes are inspected for dimensional accuracy and surface condition before finning.
- Surface preparation — The tube surface is cleaned to provide suitable fin-to-tube contact.
- Fin strip preparation — The selected fin strip is formed and controlled for consistent width and thickness.
- Helical winding — The fin strip is continuously wound around the tube at the specified pitch.
- Fin securing — Depending on the design, the fin may be mechanically tensioned, embedded, welded, or otherwise secured to achieve the required thermal contact.
- Dimensional inspection — Fin height, pitch, tube diameter, overall length, and straightness are checked.
- Final inspection and protection — Products are inspected, marked, bundled, and protected for transportation.
ASTM A179 Chemical Composition
ASTM A179 specifies a low-carbon seamless heat-exchanger and boiler tube material. Typical chemical requirements include:
| Element |
ASTM A179 Requirement |
| Carbon (C) |
≤ 0.06% |
| Manganese (Mn) |
0.27–0.63% |
| Phosphorus (P) |
≤ 0.035% |
| Sulfur (S) |
≤ 0.035% |
The chemical composition of the supplied material is verified against the applicable material certificate and purchase specification.
Mechanical Properties of ASTM A179
Typical minimum mechanical requirements include:
| Property |
Requirement |
| Tensile strength |
≥ 325 MPa |
| Yield strength |
≥ 180 MPa |
| Elongation |
≥ 35% |
Actual supplied material shall comply with the applicable edition of ASTM A179/ASME SA179 and the customer's purchase requirements.
Inspection and Testing
Quality control can include:
- Chemical composition analysis — Verification of the base tube material.
- Tensile testing — Verification of tensile strength, yield strength, and elongation.
- Hardness testing — Performed where required by the applicable specification or purchase order.
- Hydrostatic or nondestructive electric test — Base tubes are tested according to ASTM A179 requirements.
- Dimensional inspection — Measurement of tube OD, wall thickness, length, fin height, fin thickness, and fin pitch.
- Visual inspection — Examination for surface defects, deformation, damaged fins, and manufacturing irregularities.
- Fin attachment/contact inspection — Verification of the specified winding and attachment condition.
- Straightness inspection — Confirmation that finished tubes meet the specified dimensional tolerances.
- Material traceability — Heat number and material documentation can be maintained throughout production.
Additional NDT, PMI, coating inspection, or customer-specific testing can be arranged when required.
Applications
ASTM A179 wound fin tubes are commonly used in:
- Air-cooled heat exchangers (ACHE)
- Process air coolers
- Air-cooled condensers
- Oil coolers
- Gas coolers
- Compressor coolers
- Petrochemical process units
- Refinery cooling systems
- Natural gas processing equipment
- Power-generation auxiliary cooling systems
- Industrial heat-recovery equipment
Why Choose Wound Fin Tubes?
For air coolers, the air side generally represents the greater heat-transfer resistance because air has a much lower heat-transfer coefficient than many process fluids. Increasing the external surface area with fins allows a larger heat-transfer duty to be achieved within a practical equipment footprint.
The wound-fin configuration provides a continuous helical fin surface around the tube and can be manufactured with different fin heights, pitches, and materials to meet different thermal-design requirements.
Supply Options
We can manufacture ASTM A179 wound fin tubes according to:
- Customer drawings
- Tube OD and wall thickness
- Fin material
- Fin height and thickness
- Fin pitch
- Tube length
- Finning method
- Surface treatment
- Heat-transfer design requirements
- Inspection and testing requirements
- Packing and marking specifications
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