Stainless Steel Coil Tube (Coiltube) — Dual-Coil UHT Sterilization System
Product Overview
The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered coiled tubular product designed specifically for integration into dual-coil ultrahigh temperature (UHT) sterilization systems. These coil tubes serve as critical heat exchange and fluid transfer components within industrial sterilization equipment, enabling rapid and uniform thermal processing of liquid food products, pharmaceuticals, and biotech media. The dual-coil configuration maximizes heat transfer surface area within a compact footprint, ensuring efficient pasteurization and sterilization performance at temperatures exceeding 135°C (275°F).
Material & Properties
The coil tubes are fabricated from high-grade austenitic stainless steel, selected for exceptional corrosion resistance, thermal stability, and hygienic compatibility in food-grade and pharmaceutical applications.
- Primary Alloy Grades: SUS304 (UNS S30400), SUS316L (UNS S31603), and SUS321 (UNS S32100) depending on application requirements
- Corrosion Resistance: Excellent resistance to organic acids, alkaline solutions, and chloride-containing media
- Thermal Conductivity: Optimized for rapid heat transfer in UHT processing cycles
- Mechanical Strength: Maintains dimensional integrity under repeated thermal cycling and pressure fluctuations
- Surface Finish: Electropolished to Ra ≤ 0.5 μm for hygienic compliance and prevention of biofilm formation
- Compliance: Meets FDA 21 CFR, EU Regulation 1935/2004, and 3-A Sanitary Standards
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd. |
| Product Catalog No. | 1702 |
| Material Grade | SUS304 / SUS316L / SUS321 (customizable) |
| Outer Diameter (OD) | 6 mm – 25 mm (standard range) |
| Wall Thickness | 0.5 mm – 1.5 mm |
| Coil Diameter | 50 mm – 200 mm |
| Coil Length | Up to 30 m per coil assembly |
| Maximum Operating Temperature | 150°C (302°F) |
| Maximum Operating Pressure | 0.6 MPa (6 bar) |
| Surface Treatment | Electropolished / Passivated |
| Connection Type | Tri-Clamp (TC), Welded, or Flanged |
| Hygienic Standard | 3-A / EHEDG Compliant |
| Configuration | Dual-Coil (Twin-Coil) for UHT Sterilization |
Manufacturing Process
The production of these coil tubes follows a rigorous multi-stage manufacturing protocol to ensure dimensional accuracy, structural integrity, and hygienic surface quality:
- Material Selection & Inspection: Raw stainless steel pipe stock is sourced from certified mills and subjected to spectroscopic analysis (PMI — Positive Material Identification) to verify alloy composition.
- Cold Drawing & Sizing: Precision cold-drawing processes achieve exact outer diameter and wall thickness tolerances (±0.05 mm).
- Coil Forming: Computerized coil-winding machines form the tube into the specified helical geometry with controlled pitch and diameter, ensuring uniform curvature without distortion or micro-cracking.
- Welding & Sealing: Orbital TIG welding (Tungsten Inert Gas) is employed for all circumferential and longitudinal welds, producing smooth, crevice-free joints suitable for CIP (Clean-In-Place) and SIP (Sterilize-In-Place) protocols.
- Electropolishing: The internal and external surfaces undergo electrolytic polishing to achieve a mirror-smooth finish (Ra ≤ 0.5 μm), removing surface contaminants and enhancing passive oxide layer formation.
- Passivation: Nitric acid or citric acid passivation treatments are applied to maximize corrosion resistance and ensure a stable chromium oxide film.
- Pressure Testing & Leak Detection: Each coil assembly undergoes hydrostatic pressure testing at 1.5× the maximum operating pressure, followed by helium leak detection for critical applications.
- Final Inspection & Certification: Dimensional verification, visual inspection, and documentation preparation in accordance with applicable quality standards.
Applications
The dual-coil UHT sterilization coil tubes are integral components in the following industrial sectors:
- Dairy Industry: UHT milk, cream, and yogurt processing systems where rapid heating and controlled cooling are essential for shelf-life extension.
- Plant-Based Beverage Processing: Soy milk, almond milk, and other plant protein beverages requiring thermal sterilization without flavor degradation.
- Pharmaceutical & Biotechnology: Sterilization of culture media, fermentation broth, and injectable pharmaceutical solutions.
- Food & Beverage Industry: Fruit juices, soups, sauces, and ready-to-eat liquid foods processed under UHT conditions.
- Chemical Processing: Heat exchange in corrosive fluid handling systems requiring stainless steel construction.
- Medical Device Manufacturing: Sterilization of liquid reagents and biological samples in laboratory and production environments.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework ensuring that every coil tube product meets international standards:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System
- CE Marking — European Conformity for machinery and components
- ASME BPV Code — Boiler and Pressure Vessel Code compliance (where applicable)
- 3-A Sanitary Standards — Food Industry Sanitation Certification
- EHEDG Guidelines — European Hygienic Engineering Design Group conformity
- NSF/ANSI 61 — Drinking Water System Components (where applicable)
- FDA 21 CFR 178.301 — Food Contact Materials Compliance
Unique Selling Points
The dual-coil configuration represents a significant advancement in UHT sterilization technology. By employing twin helical coil assemblies, this product achieves superior heat transfer efficiency compared to single-coil designs, reducing thermal processing time and preserving product quality. The electropolished surface finish eliminates dead zones and microbial harborage points, ensuring consistent CIP/SIP performance throughout the product lifecycle. Wenzhou Jixing Metal Materials Co., Ltd. offers full customization of coil geometry, material grade, and connection interfaces to meet specific OEM and end-user requirements.