Stainless Steel Coil Tube for Evaporative Cooling Systems
Product Overview
The Stainless Steel Coil Tube (Product No. 237) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered coiled tubing solution specifically designed for evaporative cooling applications. This product is integral to evaporative cooling systems where water distribution uniformity across the coil surface plays a critical role in thermal performance and energy efficiency. The coil tube is engineered to withstand high-pressure spray water systems while maintaining structural integrity under continuous thermal cycling.
Extensive research on the effects of cooling air velocity and spray water flow rate on the water distribution uniformity of evaporative cooling coil tubes has informed the design optimization of this product, ensuring superior heat transfer performance and long-term reliability in demanding industrial environments.
Material & Properties
The stainless steel coil tube is fabricated from high-grade austenitic stainless steel, offering exceptional corrosion resistance, mechanical strength, and thermal conductivity suitable for evaporative cooling duty cycles.
- Base Material: Austenitic Stainless Steel (304/316L grade)
- Corrosion Resistance: Excellent resistance to chlorides, sulfides, and acidic condensates common in evaporative cooling environments
- Thermal Conductivity: Optimized for efficient heat exchange between spray water and ambient air
- Mechanical Strength: High yield strength ensuring resistance to vibration and thermal expansion stresses
- Surface Finish: Polished interior surface to minimize flow resistance and prevent scale buildup
- Operating Temperature Range: -40°C to +120°C
- Hygienic Compatibility: Suitable for food-grade and pharmaceutical applications where sanitary standards are required
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管) |
| Product Number | 237 |
| Material Grade | 304 / 316L Austenitic Stainless Steel |
| Outer Diameter (OD) | 6 mm – 25 mm (customizable) |
| Wall Thickness | 0.5 mm – 2.0 mm |
| Coil Diameter | 50 mm – 500 mm |
| Coil Length | Up to 50 m (continuous coil) |
| Maximum Working Pressure | 1.6 MPa (standard); 4.0 MPa (reinforced) |
| Hydrostatic Test Pressure | 2.5 × Working Pressure |
| Surface Treatment | Mirror polish / Passivation |
| Dimensional Tolerance | ±0.05 mm (OD); ±10% (wall thickness) |
| Applicable Standards | ASTM A269 / ASME SA-213 / EN 10217 |
| Delivery Form | Coiled / Straight lengths |
Manufacturing Process
- Raw Material Selection: High-purity stainless steel strip or seamless tubing is sourced from certified mills with full chemical composition traceability.
- Coil Forming: Cold coiling or hot forming processes are employed to achieve precise coil diameters and consistent pitch, ensuring uniform water distribution when installed in evaporative cooling headers.
- Heat Treatment: Solution annealing at 1050°C–1150°C followed by controlled cooling to eliminate residual stresses and optimize the austenitic microstructure.
- Mechanical Testing: Each batch undergoes tensile testing, hardness verification, and impact testing to confirm conformance with specified mechanical properties.
- Hydrostatic Pressure Testing: Individual coils are subjected to hydrostatic testing at 2.5× the maximum working pressure to verify weld integrity and dimensional accuracy.
- Surface Finishing: Electropolishing or mechanical polishing is applied to achieve the required surface roughness (Ra ≤ 0.4 μm) for optimal fluid dynamics performance.
- Final Inspection: Non-destructive testing (NDT) including eddy current inspection and visual examination ensures zero-defect delivery.
Applications
- Industrial Evaporative Cooling: Primary heat exchange element in cooling towers, evaporative condensers, and air-cooled chillers where water distribution uniformity directly impacts cooling capacity.
- Food & Beverage Processing: Sanitary-grade coil tubes for pasteurization systems, CIP (Clean-in-Place) loops, and refrigeration heat exchangers.
- Pharmaceutical Manufacturing: High-purity cooling circuits requiring corrosion-free, biofilm-resistant tubing.
- Chemical Processing: Resistance to aggressive process fluids in heat exchangers and reactor cooling jackets.
- HVAC Systems: Chilled water distribution coils in commercial and industrial air handling units.
- Power Generation: Condenser tubing and cooling water circuits in thermal power plants.
Quality Certifications
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- ASME Stamp — Pressure vessel and piping component certification
- EN 10204 3.1 — Full material certification with independent test reports
- Mill Test Reports (MTR) — Chemical analysis and mechanical property documentation for every batch
- Third-Party Inspection — Available upon request (SGS, BV, TUV)
Unique Selling Points
Optimized for Evaporative Cooling Performance: Informed by rigorous research on cooling air velocity and spray water flow rate effects on water distribution uniformity, this coil tube design ensures even water film coverage across the entire coil surface, maximizing latent heat transfer and minimizing dry spots that degrade cooling efficiency.
- Superior Corrosion Resistance: 316L grade option provides exceptional resistance to chloride-induced pitting in humid evaporative cooling environments.
- Precision Dimensional Control: Tight tolerances on coil pitch and tube diameter ensure consistent hydraulic performance and ease of installation into standard header manifolds.
- Full Traceability: Every coil is batch-traceable from raw material mill certificates through final inspection, ensuring complete supply chain accountability.
- Custom Engineering: Tailored coil configurations (diameter, pitch, length, and end treatments) available to meet specific evaporative cooling system requirements.
- Long Service Life: Proven durability exceeding 20 years in continuous-duty evaporative cooling applications with minimal maintenance.