Stainless Steel Coil Tube (Coiltube) — Factory Farming Temperature Regulation System
Product Overview
The Stainless Steel Coil Tube (Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd, is a precision-engineered heat exchanger component designed for temperature regulation systems in industrial and aquaculture applications. This product is specifically engineered for factory farming tank environments where consistent thermal management is critical to maintaining optimal water temperature for aquatic species. The coil tube is supplied in continuous coil form, facilitating efficient installation in closed-loop heating or cooling circuits within recirculating aquaculture systems (RAS).
Based on comparative economic analysis documented in industry literature, stainless steel coil tubes have demonstrated superior long-term cost-effectiveness in factory farming pool temperature regulation compared to alternative materials, owing to their exceptional corrosion resistance, thermal conductivity, and extended service life.
Material & Properties
Material Grades
- Austenitic Stainless Steel (奥氏体不锈钢): Grades 304 (UNS S30400) and 316 (UNS S31600) conforming to ASTM A269/A269M specifications
- Superaustenitic Stainless Steel (超级奥氏体不锈钢): Grade 2205 Duplex (UNS S32205) for high-chloride environments
Key Physical & Chemical Properties
- Thermal Conductivity (热导率): 14–16 W/(m·K) for 304 grade; 13–14 W/(m·K) for 316 grade
- Corrosion Resistance (耐蚀性): Excellent resistance to chloride-induced pitting and crevice corrosion, particularly in Grade 316 and 2205
- Maximum Operating Temperature (最高工作温度): Up to 450°C (842°F)
- Minimum Operating Temperature (最低工作温度): Down to −196°C (liquid nitrogen compatible)
- Chromium Content (铬含量): 18–20% minimum
- Nickel Content (镍含量): 8–12% minimum
- Molybdenum Content (钼含量): 2–3% (Grade 316 and above)
- Surface Finish (表面光洁度): Ra ≤ 0.8 μm (electropolished available upon request)
Specifications
| Parameter | Specification | Standard/Reference |
|---|---|---|
| Outer Diameter (OD, 外径) | Φ6 mm – Φ50 mm (customizable) | ASTM A269 |
| Wall Thickness (壁厚) | 0.5 mm – 3.0 mm | ASTM A269 / GB/T 12771 |
| Bend Radius (弯曲半径) | ≥ 3× OD (minimum) | ISO 4427 |
| Coil Diameter (盘管直径) | Φ200 mm – Φ2000 mm | Customer-specific |
| Coil Length (盘管长度) | Up to 100 m per coil | — |
| Surface Treatment (表面处理) | Pickled & Passivated / Electropolished | ASTM A967 |
| End Form (端部形式) | Plain cut / Threaded (G, NPT, BSP) / Flanged | ISO 7 / ASME B1.20.1 |
| Pressure Rating (压力等级) | Up to 16 MPa (2320 psi) | ASME B31.3 |
| Tolerance on OD (外径公差) | ±0.05 mm (precision grade) | ASTM A269M |
| Acceptable Media (适用介质) | Seawater, Freshwater, Brackish Water, Chemical Solutions | — |
| Service Life (设计寿命) | ≥ 15 years in marine/aquaculture environments | — |
Manufacturing Process
- Raw Material Selection (原材料选择): Certified stainless steel strip or seamless pipe stock from approved mills (e.g., Outokumpu, Sandvik, Tsingshan), accompanied by mill test certificates (MTC) per EN 10204 3.1.
- Cold Drawing & Sizing (冷拔与定径): Multi-stage cold drawing through precision tungsten carbide dies to achieve dimensional accuracy and enhanced mechanical properties.
- Intermediate Annealing (中间退火): Solution annealing at 1050–1100°C in controlled atmosphere (H₂ or N₂) to relieve cold work stresses and restore ductility.
- Precision Bending/Forming (精密弯曲成型): CNC-controlled rotary bending with internal mandrel support to maintain uniform wall thickness and prevent ovality or wrinkling.
- Coil Winding (盘绕成型): Automated winding onto calibrated mandrels to produce consistent coil geometry with controlled pitch and diameter.
- Pickling & Passivation (酸洗钝化): Immersion in mixed acid bath (HNO₃/HF) followed by passivation treatment to remove scale and form protective chromium oxide film per ASTM A967.
- Hydrostatic Testing (水压试验): 100% leak testing at 1.5× working pressure, minimum dwell time of 30 seconds.
- Final Inspection & Packaging (终检与包装): Dimensional verification, surface inspection, and protective packaging for shipment.
Applications
- Factory Farming & Aquaculture (工厂化养殖): Temperature regulation coils for recirculating aquaculture systems (RAS), including marine fish farming, shrimp cultivation, and eel farming pools
- Industrial Heat Exchangers (工业换热器): Shell-and-tube heat exchanger internals for chemical processing, food and beverage, and pharmaceutical industries
- Marine & Offshore Systems (海洋与海上系统): Subsea heat exchange coils for oil & gas platforms, desalination plants, and naval applications
- Heating & Cooling Systems (供热与制冷系统): Chilled water distribution coils, HVAC terminal units, and district heating networks
- Food Processing (食品加工): Pasteurization, sterilization, and temperature-controlled fermentation equipment
- Pharmaceutical Equipment (制药设备): CIP (Clean-in-Place) systems, reactor cooling coils, and bioreactor temperature control
Unique Selling Points
- Proven Economic Superiority (经济优势实证): Comparative studies in factory farming environments have demonstrated that stainless steel coil tubes deliver a 30–45% lower total cost of ownership (TCO) over 10 years compared to carbon steel alternatives, due to negligible replacement frequency and maintenance costs.
- Exceptional Corrosion Durability (卓越耐蚀寿命): In chloride-rich aquaculture environments, 316L-grade coil tubes maintain structural integrity for 15+ years without perforation, significantly outperforming galvanized or copper-nickel alternatives.
- Hygienic Surface Quality (卫生级表面质量): Electropolished surfaces (Ra ≤ 0.4 μm) prevent biofilm adhesion, critical for food-grade and pharmaceutical applications.
- Customizable Geometry (可定制几何形状): Full CNC capability for bespoke coil configurations tailored to specific tank dimensions and flow requirements.
- Full Traceability (全链条可追溯): Each coil batch is traceable to raw material mill certificates, ensuring compliance with international regulatory frameworks.
Quality Certifications & Standards Compliance
- ISO 9001:2015 — Quality Management System (质量管理体系)
- ISO 14001:2015 — Environmental Management System (环境管理体系)
- ISO 45001:2018 — Occupational Health & Safety Management (职业健康安全管理体系)
- CE Marking — Conformity with EU Pressure Equipment Directive (PED 2014/68/EU)
- EN 10204 — Type 3.1 Mill Test Certificates (材质证明书)
- ASTM A269/A269M — Specification for Seamless Austenitic Stainless Steel Pipe (奥氏体不锈钢无缝管)
- GB/T 12771 — Chinese National Standard for Stainless Steel Seamless Tubes (不锈钢无缝钢管)
- ASME B31.3 — Process Piping Code Compliance (工艺管道规范)
- 3-A Sanitary Standards — For food processing applications (食品级卫生标准)
- NORSOK M-001 — For marine and offshore applications (海洋工程标准)
Note: Wenzhou Jixing Metal Materials Co., Ltd. provides comprehensive technical support, including thermal performance simulation, flow dynamics analysis, and system integration consultation for factory farming temperature regulation applications. Custom engineering solutions are available upon request.