FP-68LMZC Stainless Steel Coil Tube for Fan Coil Unit Systems
1. Product Overview
The FP-68LMZC Stainless Steel Coil Tube is a precision-engineered coil tube product manufactured by Wenzhou Jixing Metal Materials Co., Ltd., specifically designed for integration into fan coil unit (FCU) systems. This product represents a critical component in hydronic air conditioning and heating systems, where thermal efficiency, structural integrity, and long-term corrosion resistance are paramount. The coil tube serves as the heat exchange medium, facilitating the transfer of thermal energy between the circulating fluid (typically water or glycol solution) and the ambient air stream within the fan coil unit assembly.
As a specialized coil tube product (Product Reference No. 833), this item is classified under technical literature and engineering study materials, reflecting its importance in HVAC (Heating, Ventilation, and Air Conditioning) system design and performance optimization.
2. Material & Properties
2.1 Base Material
The coil tube is fabricated from high-grade stainless steel, selected for its exceptional balance of mechanical strength, thermal conductivity, and resistance to environmental degradation. The material composition ensures compliance with international standards for stainless steel tubing used in HVAC applications.
2.2 Key Material Properties
- Corrosion Resistance (Corrosion Resistance): Superior resistance to oxidation, pitting, and general corrosion in humid and chemically aggressive environments typical of HVAC systems.
- Thermal Conductivity (Thermal Conductivity): Adequate thermal transfer characteristics enabling efficient heat exchange between the fluid medium and the surrounding air.
- Mechanical Strength (Mechanical Strength): High tensile strength and yield strength ensuring dimensional stability under thermal cycling and pressure loading conditions.
- Hygienic Performance (Hygienic Performance): Smooth internal surface finish minimizing biofilm formation and reducing maintenance requirements.
- Temperature Tolerance (Temperature Tolerance): Operational range accommodating both heating and cooling modes of fan coil unit operation.
2.3 Material Grade Options
- 304 Stainless Steel (AISI 304): Austenitic stainless steel with 18% chromium and 8% nickel, offering excellent general corrosion resistance and weldability.
- 316L Stainless Steel (AISI 316L): Enhanced austenitic grade with molybdenum addition (2-3%), providing superior resistance to chlorides and aggressive chemical environments.
3. Technical Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Product Model | FP-68LMZC | — |
| Product Reference No. | 833 | — |
| Tube Outer Diameter (OD) | 9.52 – 12.70 | mm |
| Tube Wall Thickness | 0.40 – 0.80 | mm |
| Coil Diameter | 200 – 600 | mm |
| Coil Length (Total Unwound Length) | 10 – 120 | m |
| Number of Circuits | 1 – 8 | circuits |
| Operating Pressure (Max) | 1.6 | MPa |
| Operating Temperature Range | −30 to +120 | °C |
| Heat Transfer Coefficient | ≥ 800 | W/(m²·K) |
| Surface Finish (Internal) | ≤ 0.4 | μm Ra |
| Surface Finish (External) | ≤ 0.8 | μm Ra |
| Coating Option | Passivated / Anti-corrosion coating available | — |
| Applicable Standards | ASTM A269, EN 10216-5, GB/T 12771 | — |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd. | — |
4. Manufacturing Process
4.1 Process Flow
- Raw Material Selection: Procurement of certified stainless steel strip or seamless tube stock meeting specified alloy grade requirements. Incoming material is subjected to spectroscopic verification (Spectroscopic Analysis) and mechanical property testing.
- Coil Forming (Coil Forming): Precision roll-forming or tube-bending processes are employed to shape the straight tube into the required coil geometry. Computer Numerical Control (CNC) bending equipment ensures dimensional accuracy within ±0.5 mm tolerance.
- Welding (if applicable): For welded coil tube configurations, TIG (Tungsten Inert Gas) welding or laser welding is utilized to create hermetic joints. Weld seams are ground smooth to minimize flow turbulence and pressure drop.
- Heat Treatment (Heat Treatment): Stress-relief annealing is performed to eliminate residual stresses introduced during forming, ensuring dimensional stability and improved fatigue resistance.
- Surface Treatment (Surface Treatment): Pickling and passivation processes are applied to remove surface contaminants and establish a protective chromium oxide layer, enhancing long-term corrosion resistance.
- Quality Inspection: Comprehensive inspection including hydrostatic pressure testing, dimensional measurement, visual examination, and non-destructive testing (Non-Destructive Testing, NDT) such as eddy current or dye penetrant inspection.
- Packaging: Finished coil tubes are protected with anti-condensation wrapping and packaged for shipment to prevent mechanical damage and moisture exposure.
4.2 Process Quality Control
Each production batch undergoes rigorous quality control (Quality Control, QC) protocols including:
- Batch material certification traceability
- In-process dimensional verification at critical stages
- 100% hydrostatic pressure testing (Hydrostatic Pressure Testing)
- Sampling-based mechanical property verification per ASTM E8 standard
- Final inspection report documentation for each lot
5. Applications
5.1 Primary Application: Fan Coil Units
The FP-68LMZC coil tube is purpose-designed for integration into FP-68LMZC series fan coil units, which are widely deployed in commercial and industrial HVAC systems. These units provide localized temperature control through air-side heat exchange facilitated by the stainless steel coil tube.
5.2 Application Segments
- Commercial Buildings (Commercial Buildings): Office complexes, shopping malls, hotels, and hospitals requiring precise indoor climate control.
- Industrial Facilities (Industrial Facilities): Process plants, laboratories, and manufacturing environments with stringent temperature and humidity control requirements.
- Institutional Buildings (Institutional Buildings): Schools, universities, government buildings, and public assembly spaces.
- Residential High-End Systems (Residential High-End Systems): Luxury residential developments employing hydronic radiant and air-based comfort systems.
- Specialty Environments (Specialty Environments): Clean rooms, pharmaceutical facilities, and food processing plants where corrosion resistance and hygienic design are critical.
5.3 System Integration
The coil tube integrates seamlessly with standard fan coil unit components including:
- Blower assemblies (Axial or Centrifugal fans)
- Filter stages (MERV-rated air filtration)
- Drain pans and condensate management systems
- Control valves and thermostatic regulation systems
- Insulation and casing assemblies
6. Quality Certifications & Standards Compliance
6.1 International Standards
- ASTM A269/A269M: Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Applications.
- EN 10216-5: Non-alloy and Alloy Steel Tubes — Technical Delivery Conditions — Part 5: Cold Drawn Tubes of Austenitic Stainless Steel.
- ISO 9001:2015: Quality Management Systems (Quality Management Systems) — Requirements.
- GB/T 12771: Chinese National Standard for Stainless Steel Seamless Tubes for General Purposes.
6.2 Product Certifications
- Material Mill Test Certificate (Mill Test Certificate, MTC) for each production lot
- Pressure Test Report (Pressure Test Report) documenting hydrostatic test results
- Dimensional Inspection Report (Dimensional Inspection Report) with measurement data
- Third-party inspection available upon request (e.g., SGS, Bureau Veritas)
- CE marking compliance for European market applications
6.3 Environmental & Sustainability Certifications
- RoHS (Restriction of Hazardous Substances) compliant
- REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) compliant
- Recyclable material content ≥ 95%
- Low embodied carbon manufacturing practices
7. Unique Selling Points
- Enhanced Durability: Stainless steel construction provides a service life exceeding 25 years under normal operating conditions, significantly outperforming copper and carbon steel alternatives in corrosive environments.
- Superior Hygienic Performance: Smooth internal surface finish (Ra ≤ 0.4 μm) minimizes bacterial adhesion and biofilm formation, reducing maintenance frequency and ensuring consistent heat transfer performance over the product lifecycle.
- Precision Engineering: CNC-controlled coil forming ensures uniform tube spacing and dimensional accuracy, optimizing airflow distribution and heat exchange efficiency within the fan coil unit.
- Thermal Cycling Resilience: Excellent fatigue resistance under repeated thermal expansion and contraction cycles, ensuring long-term dimensional stability and leak-free performance.
- Design Flexibility: Available in multiple coil diameters, circuit configurations, and material grades to accommodate diverse system design requirements and operating conditions.
- Full Traceability: Complete material and manufacturing documentation for each production lot, supporting regulatory compliance and quality assurance programs.
- Cost-Effective Lifecycle: While initial material cost may be higher than alternative metals, the extended service life, reduced maintenance requirements, and superior corrosion resistance result in significantly lower total cost of ownership (Total Cost of Ownership, TCO).
8. Conclusion
The FP-68LMZC Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. represents a high-performance engineering solution for fan coil unit applications demanding reliability, efficiency, and longevity. Its adherence to international quality standards, combined with advanced manufacturing processes and comprehensive quality assurance protocols, positions this product as a preferred choice for professional HVAC system designers and integrators worldwide.