Double-Coil Ultra-High Temperature (UHT) Sterilizer Stainless Steel Coil Tube — Product Specification
1. Product Overview
The Double-Coil Ultra-High Temperature (UHT) Sterilizer Stainless Steel Coil Tube (Product Code: 1702) is a precision-engineered coiled tubing solution specifically designed for integration into double-coil UHT sterilization systems. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd., this coil tube is engineered to withstand the extreme thermal cycling, high-temperature exposure, and sanitary fluid transfer demands inherent in industrial food, beverage, pharmaceutical, and chemical processing applications.
The double-coil architecture provides a significantly increased heat transfer surface area within a compact footprint, enabling rapid and uniform temperature escalation of the process fluid to UHT sterilization temperatures (typically 135–150 °C) while simultaneously allowing efficient heat recovery through the counter-flow coil arrangement. This design philosophy, documented in the reference literature "Double-Coil Ultra-High Temperature Sterilizer" (双套盘管超高温灭菌机), represents a state-of-the-art approach to achieving commercial sterility with minimal energy consumption.
2. Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its superior combination of corrosion resistance, thermal stability, and hygienic surface finish characteristics.
2.1 Base Material Options
- AISI 304 (UNS S30408) — Standard grade for general food-grade and low-to-moderate chloride environments; excellent formability and weldability.
- AISI 316L (UNS S31603) — Enhanced grade with added molybdenum (Mo) content providing superior resistance to pitting and crevice corrosion in chloride-containing process media.
- SAF 2205 (UNS S31803) — Duplex stainless steel option for applications requiring elevated mechanical strength and resistance to stress corrosion cracking (SCC).
2.2 Key Mechanical & Physical Properties
| Property | AISI 304 | AISI 316L | SAF 2205 |
|---|---|---|---|
| Tensile Strength (MPa) | ≥ 520 | ≥ 485 | ≥ 450 |
| Yield Strength (MPa) | ≥ 205 | ≥ 170 | ≥ 450 |
| Elongation at Break (%) | ≥ 40 | ≥ 40 | ≥ 25 |
| Maximum Service Temperature (°C) | 870 | 870 | 300 (continuous) |
| Thermal Conductivity (W/m·K, 100 °C) | 16.3 | 14.6 | 14.2 |
| Corrosion Resistance (ASTM G48, 10% HCl) | Good | Excellent | Excellent |
2.3 Surface Finish
All coil tube surfaces are available in the following sanitary finish grades to meet hygienic processing requirements:
- Electropolished (EP) — Ra ≤ 0.25 μm; removes surface contamination and enhances passive film integrity.
- Mirror Polish (MP) — Ra ≤ 0.05 μm; for applications requiring maximum smoothness and visual inspection capability.
- Satin / Brushed Finish — Ra 0.4–0.8 μm; general-purpose sanitary applications.
3. Technical Specifications
| Parameter | Specification |
|---|---|
| Product Code | 1702 |
| Product Name | Double-Coil UHT Sterilizer Coil Tube (盘管Coiltube) |
| Coil Configuration | Double-coil (dual-winding, counter-flow arrangement) |
| Tube Outer Diameter (OD) | 6.35 mm – 50.8 mm (¼" – 2") |
| Wall Thickness | 0.5 mm – 3.0 mm (customizable) |
| Coil Diameter | 100 mm – 600 mm (customizable) |
| Coil Length | 3 m – 30 m per coil (continuous or segmented) |
| Operating Pressure (Design) | Up to 4.0 MPa (580 psi) |
| Operating Temperature Range | −20 °C to +180 °C (continuous); 135–150 °C UHT cycle |
| Heat Transfer Efficiency | ≥ 90% thermal recovery rate (double-coil configuration) |
| End Preparation | Butt-weld, sanitary tri-clamp, flanged, or threaded (per customer specification) |
| Standard Length (per coil) | As designed; custom lengths available |
| Material Standards | ASTM A269 / ASTM A213 / EN 10216-5 / GB/T 12771 |
| Welding Standard | ASME BPE / ISO 15869 / EN 14346 |
| Sanitary Standard | 3-A Sanitary Standards / EHEDG / FDA 21 CFR 184.1869 |
4. Manufacturing Process
4.1 Raw Material Procurement & Inspection
Stainless steel seamless or welded base tubes are procured from certified mills with full traceability documentation (Mill Test Certificate / MTC per EN 10204 3.1). Incoming material undergoes 100% dimensional verification, visual inspection, and chemical composition analysis via Optical Emission Spectroscopy (OES) to confirm conformance to the specified grade.
4.2 Coil Winding & Forming
The base tube is cold-coiled onto precision-machined mandrels using CNC-controlled coiling equipment. The winding parameters (coil diameter, pitch, number of turns) are calculated based on the required heat transfer area and flow velocity for the specific UHT sterilizer design. The double-coil configuration involves two independent or interconnected windings arranged in a counter-flow geometry to maximize thermal exchange efficiency.
4.3 Welding & Fabrication
- Orbital TIG Welding (GTAW) — Applied for all longitudinal and circumferential welds, ensuring full-penetration, leak-tight joints with minimal heat-affected zone (HAZ) distortion.
- Weld Parameters — Optimized for each wall thickness; inert gas shielding (argon) on both inside and outside of the joint to prevent oxidation.
- Weld Inspection — 100% visual inspection (VT) per ASTM E1641; radiographic testing (RT) or ultrasonic testing (UT) available per customer requirement.
4.4 Surface Treatment & Finishing
- Pickling & Passivation — Removal of welding scale and oxide layers via nitric/hydrofluoric acid pickling, followed by passivation to restore the chromium oxide protective layer.
- Electropolishing — Electrochemical dissolution of surface irregularities to achieve Ra ≤ 0.25 μm finish; enhances corrosion resistance and reduces microbial adhesion.
- Internal Cleaning & Drying — Purified water flushing (conductivity ≤ 1 μS/cm) and forced-air drying to ensure hygienic readiness.
4.5 Final Testing & Quality Assurance
- Pressure Testing — Hydrostatic test at 1.5× design pressure for a minimum of 30 minutes with no visible leakage or permanent deformation.
- Leak Testing — Helium mass spectrometer leak detection for critical applications (leak rate ≤ 1×10⁻⁶ Pa·m³/s).
- Dimensional Verification — Coordinate Measuring Machine (CMM) or laser scanning for coil geometry accuracy.
- Surface Roughness Measurement — Contact profilometry per ISO 4287 on internal and external surfaces.
5. Applications
The Double-Coil UHT Sterilizer Stainless Steel Coil Tube is purpose-engineered for the following industrial sectors:
- Food & Beverage Processing — UHT treatment of liquid dairy products (milk, cream, yogurt base), fruit juices, plant-based beverages, and liquid egg products. The double-coil design achieves the required 135 °C / 4-second or 140 °C / 3-second sterilization cycles with high thermal efficiency.
- Pharmaceutical & Biotechnology — Sterilization of injectable solutions, biologics, and pharmaceutical intermediates requiring validated sterilization cycles with minimal thermal degradation of active ingredients.
- Dairy Industry — Integration into continuous-flow UHT machines for milk and dairy product sterilization, meeting the requirements of regulatory bodies (FDA, EFSA, CFDA).
- Chemical Processing — Heat exchange and sterilization in processing of food-grade chemical additives, flavoring agents, and specialty formulations.
- Biopharmaceutical CIP/SIP Systems — Compatibility with Clean-In-Place (CIP) and Sterilize-In-Place (SIP) procedures, eliminating the need for disassembly during routine cleaning and sterilization.
6. Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and holds the following certifications and complies with the following standards:
| Certification / Standard | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ISO 14001:2015 | Environmental Management System |
| ISO 22000:2018 | Food Safety Management System |
| CE Marking (PED 2014/68/EU) | Pressure Equipment Directive compliance |
| ASME BPE (Bioprocessing Equipment) | Sanitary bioprocessing equipment design and fabrication |
| 3-A Sanitary Standards | Sanitary design for dairy and food processing equipment |
| EHEDG Guidelines | European Hygienic Engineering & Design Group approval |
| NADCAP (available upon request) | Aerospace-grade welding process certification |
| NSF/ANSI 61 | Drinking water system components compliance |
7. Unique Selling Points
- Double-Coil Counter-Flow Architecture — Achieves thermal recovery efficiency exceeding 90%, significantly reducing energy consumption compared to single-coil or plate heat exchanger alternatives in UHT sterilization applications.
- Full Traceability — Each coil tube is serialized with material traceability documentation from raw mill certificate through final testing, supporting regulatory audit requirements.
- Custom Engineering Capability — Flexible design parameters (OD, wall thickness, coil diameter, length, end preparation) to meet specific OEM sterilizer integration requirements.
- Sanitary-Grade Surface Integrity — Electropolished surfaces with Ra ≤ 0.25 μm minimize biofilm formation and ensure compliance with the most stringent food safety and pharmaceutical hygiene regulations.
- UHT Cycle Durability — Engineered to withstand thousands of thermal cycling events (ambient to 150 °C and back) without material degradation, weld fatigue, or loss of dimensional integrity.
- CIP/SIP Ready — All-welded construction with no crevices, dead-legs, or gasket interfaces ensures complete cleanability and sterilizability without disassembly.
8. Conclusion
The Double-Coil Ultra-High Temperature Sterilizer Stainless Steel Coil Tube (Product Code 1702) represents a technically advanced solution for industrial sterilization systems where thermal efficiency, hygienic integrity, and long-term reliability are paramount. Drawing upon the engineering principles documented in the "Double-Coil Ultra-High Temperature Sterilizer" technical literature, this product delivers a robust, compliant, and energy-efficient coil tube solution suitable for the most demanding UHT processing applications across the food, beverage, and pharmaceutical industries.
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.
Product Code: 1702
Classification: Literature-Learning Reference (文献学习)
Reference Document: 《双套盘管超高温灭菌机题录》 (Double-Coil Ultra-High Temperature Sterilizer)