Stainless Steel Oval finned tube
What are stainless steel oval finned tubes?
Stainless steel oval finned tubes are high-efficiency heat transfer components composed of an elliptical stainless steel base tube (e.g., 304/316L) with externally welded or rolled fins. The oval geometry (typical axis ratios of 2:1 or 3:1) reduces fluid resistance by 15–30% compared to round tubes while increasing heat exchange surface area via finned structures (spiral/helical or longitudinal).
Stainless steel oval finned tubes Features & Benefits
Corrosion Resistance
Material options:
316L: Superior chloride resistance (e.g., marine/offshore, flue gas desulfurization).
310S: Oxidation-resistant up to 1100°C (e.g., high-temperature exhaust recovery).
Surface treatments: Electro-polishing (Ra ≤ 0.8μm) or PTFE coating for anti-fouling.
Enhanced Thermal Efficiency Fin ratio: 8:1 to 15:1 (surface area/plain tube area). Heat transfer coefficient: 200–300 W/m²·K (verified by ANSYS Fluent simulations). Oval tube advantage: Lower pressure drop (ΔP) via optimized hydraulic diameter.
Mechanical Robustness Tensile strength: ≥515 MPa (ASTM A370).
Pressure rating: Up to 35 MPa (ASME BPVC VIII). Vibration resistance: Passes 10⁷ cycles (ISO 1940-1).
Temperature & Fluid Adaptability
Operating range: -196°C to 1100°C (material-dependent). Compatible media: Steam, oils, corrosive gases (e.g., H₂S, SO₂).
Low Maintenance Anti-scaling design: Wide fin spacing (≥8mm) for easy cleaning. Maintenance: 5% citric acid flush or compressed air pulse cleaning.
Stainless steel oval finned tubes Fabrication Process
Welding: Nickel-based brazing or TIG welding (100% weld penetration rate).
Fin attachment: Expantion, High-frequency welding (for thin fins) or laser welding (precision).
Quality control: Eddy current testing, hydrostatic pressure checks. Stainless steel oval finned tubes
Standard Specifications
|
Parameter |
Example Value |
Standard |
|
Base tube |
36×14×2.5mm (oval) |
ASTM A213/A269 |
|
Fins |
55×26×0.25mm, pitch 2.8mm |
GB/T 15386 |
|
Salt spray test |
500h (no rust) |
ASTM B117 |
Stainless steel oval finned tubes Applications
Power plants: Air preheaters (replace round tubes to cut ΔP by 18%).
Petrochemical: Crude oil heaters (316L resists sulfur corrosion).
HVAC: Compact heat exchangers (oval tubes save 20% space).
Cost-Benefit Analysis
|
Metric |
Carbon Steel Finned Tube |
Stainless Oval Finned Tube |
|
Service life |
5–8 years |
15+ years |
|
Maintenance cost |
$600/m (replacement) |
$50/m (cleaning) |
FAQ
Q: How to verify heat transfer performance?
A: Third-party tests (e.g., SGS) using ISO 12247 or ASTM D3523.
Q: Customization options?
A: Adjust fin height (5–20mm), spacing (3–15mm), and axis ratio (2:1 to 3:1).
