Stainless Steel Coil Tube (Coiltube) for HVAC & Fan Coil Unit Systems
Product Overview
The Stainless Steel Coil Tube (Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a precision-engineered tubular component designed for integration into Fan Coil Unit (FCU) systems within Intelligent Building Control Systems (IBCS). This coiltube serves as a critical heat exchange medium, facilitating efficient thermal transfer between circulating fluid and ambient air in modern HVAC (Heating, Ventilation, and Air Conditioning) installations. The product is specifically engineered to support advanced temperature regulation, humidity control, and energy management functions inherent to smart building environments.
As a key component within the thermal delivery infrastructure of intelligent buildings, the coiltube must exhibit superior corrosion resistance, thermal conductivity, mechanical durability, and dimensional precision to ensure long-term reliability in automated control loops governed by programmable temperature controllers and Building Management Systems (BMS).
Material & Properties
The coiltube is fabricated from high-grade austenitic stainless steel, selected for its exceptional balance of mechanical strength, thermal performance, and resistance to environmental degradation.
- Base Alloy: Austenitic stainless steel (304 / 316L grade, depending on application requirements)
- Corrosion Resistance: Superior resistance to chlorides, condensation, and chemical contaminants common in HVAC environments
- Thermal Conductivity: Optimized for efficient heat exchange between the circulating medium (water or refrigerant) and the surrounding air stream
- Mechanical Strength: High tensile strength ensuring resistance to vibration-induced fatigue in fan-driven systems
- Hygienic Surface: Smooth, non-porous internal and external surfaces preventing microbial growth and scale accumulation
- Operating Temperature Range: -40°C to +250°C, accommodating both heating and cooling cycles
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd. |
| Material Grade | ASTM A269 / A270 — 304, 316L, or equivalent |
| Outer Diameter (OD) | 6.35 mm – 25.4 mm (standard range; custom available) |
| Wall Thickness | 0.5 mm – 2.0 mm (customizable per application) |
| Coil Length | 5 m – 50 m per spool (adjustable) |
| Surface Finish | Mirror polished, sanitary pickled, or standard mill finish |
| End Treatment | Deburred, chamfered, or threaded per customer specification |
| Pressure Rating | Up to 1.6 MPa (working pressure), 2.4 MPa (test pressure) |
| Connection Method | Welded (TIG/Orbital), flanged, or threaded |
| Compliance Standards | ISO 15540, EN 10217, ASME B31.9 |
| Customization | Non-standard dimensions, coil geometry, and surface treatments available |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous multi-stage manufacturing process to ensure dimensional accuracy, material integrity, and performance reliability:
- Material Selection & Incoming Inspection: Raw stainless steel seamless tube is sourced from certified mills and subjected to spectroscopic analysis to verify chemical composition and mechanical properties.
- Precision Cutting & Deburring: Tubes are cut to specified lengths using automated cold-cutting systems, followed by mechanical deburring to eliminate burrs and ensure clean end preparation.
- Coil Forming / Bending: Tubes are formed into the required coil geometry using CNC-controlled bending equipment, ensuring uniform bend radii and minimal wall thinning at curvature points.
- Surface Treatment: Depending on the application, tubes undergo pickling, passivation, or mirror polishing to achieve the specified surface quality and corrosion resistance.
- Pressure Testing: Each coil assembly undergoes hydrostatic or pneumatic pressure testing to verify leak-tightness and structural integrity at or above the rated working pressure.
- Final Inspection & Certification: Finished products are inspected for dimensional accuracy, surface quality, and weld integrity. Material certificates (MTC/EN 10204 3.1) are issued with each batch.
Applications
The Stainless Steel Coil Tube is designed for use in a broad spectrum of HVAC and fluid transport applications, with particular emphasis on intelligent building systems:
- Fan Coil Units (FCU): Primary heat exchange component in FCU systems integrated with intelligent temperature controllers for zone-level climate control in commercial and residential buildings.
- Intelligent Building Control Systems (IBCS): Serves as the thermal delivery element within automated HVAC loops managed by Building Management Systems (BMS), enabling real-time temperature regulation and energy optimization.
- Commercial HVAC Systems: Air handling units, chilled beam systems, and radiant cooling panels in offices, hospitals, hotels, and data centers.
- Industrial Process Cooling: Precision temperature control in manufacturing environments requiring corrosion-resistant fluid circuits.
- Food & Pharmaceutical Processing: Hygienic-grade coil tubes for heat exchange in sanitary environments where 316L stainless steel is mandated.
- Marine & Offshore Systems: Corrosion-resistant coil assemblies for HVAC systems in marine environments exposed to salt-laden atmospheres.
Unique Selling Points
- Intelligent System Compatibility: Engineered to integrate seamlessly with advanced FCU temperature controllers and BMS protocols, supporting automated setpoint management, occupancy-based scheduling, and predictive maintenance algorithms.
- Extended Service Life: Superior corrosion resistance of 316L-grade stainless steel eliminates the need for frequent replacement, reducing lifecycle costs in harsh HVAC environments.
- Custom Geometric Design: Flexible coil geometry customization enables optimal fit within compact FCU enclosures, maximizing heat transfer surface area within constrained installation spaces.
- Energy Efficiency Contribution: High thermal conductivity and optimized coil geometry minimize pump energy consumption while maintaining precise temperature regulation, directly supporting building energy performance targets (LEED, BREEAM, Green Star).
- Comprehensive Quality Traceability: Full material traceability from mill certificate through final inspection ensures regulatory compliance and confidence in critical building infrastructure components.
Quality Certifications
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 certification
- EN 10204 3.1 — Material Test Certificate (MTC) provided with each production batch
- CE Marking — Conformity with European Machinery and Pressure Equipment Directives
- ASME B31.9 — Compliance with piping system standards for building services
- GB/T Standards — Compliance with Chinese national standards for stainless steel seamless tubes (GB/T 12771, GB/T 14976)
Technical Note: The integration of this stainless steel coil tube within intelligent building control architectures enables closed-loop thermal regulation, where FCU temperature controllers continuously monitor supply and return temperatures, modulate valve positions, and adjust fan speeds to maintain occupant comfort while minimizing energy consumption. The coil tube's dimensional precision and material consistency are prerequisites for reliable sensor feedback and accurate control algorithm performance.