Stainless Steel Coil Tube (盘管) — Half-Coil Heat Transfer Element
Product Overview
The Stainless Steel Coil Tube (盘管, Coil Tube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered heat transfer component designed for integration into pressure vessels, reactors, and process tanks. Unlike traditional jacketed vessel (夹套容器) configurations, the half-coil tube (半盘管) arrangement provides superior heat transfer efficiency and economic advantages, as demonstrated in comparative studies of thermal performance and cost-effectiveness. The coil tube system serves as an internal heat exchange medium, enabling efficient heating or cooling of process fluids contained within the vessel.
This product line represents a significant advancement in vessel thermal management technology, offering enhanced surface-to-volume ratios, improved heat transfer coefficients, and reduced capital expenditure compared to conventional jacketed designs. The coil tube configuration is particularly advantageous for large-diameter vessels where jacketed designs become impractical or economically unviable.
Material & Properties
Material Grades
- SUS304 / AISI 304 — General-purpose austenitic stainless steel; excellent corrosion resistance and formability
- SUS316L / AISI 316L — Low-carbon variant with superior resistance to pitting and crevice corrosion in chloride environments
- SUS321 / AISI 321 — Titanium-stabilized grade suitable for elevated-temperature applications up to 870°C
- SUS310S / AISI 310S — High-temperature resistant grade for extreme thermal cycling conditions
- Custom Alloy Options — Duplex stainless steel (2205/2507), nickel alloys (Inconel 625), and Hastelloy available upon request
Key Physical Properties (SUS316L Reference)
- Thermal Conductivity (导热系数): 16.3 W/(m·K) at 25°C
- Specific Heat Capacity (比热容): 500 J/(kg·°C) at 25°C
- Density (密度): 8,000 kg/m³
- Thermal Expansion Coefficient (热膨胀系数): 16×10⁻⁶ /°C (20–100°C)
- Maximum Operating Temperature (最高使用温度): 870°C (intermittent), 650°C (continuous)
- Minimum Operating Temperature (最低使用温度): −196°C (cryogenic capability)
Technical Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Product Name (产品名称) | Coil Tube / Half-Coil Tube (盘管/半盘管) | — |
| Outer Diameter (外径, OD) | Φ12 – Φ159 | mm |
| Wall Thickness (壁厚) | 1.0 – 8.0 | mm |
| Coil Pitch / Spacing (盘管间距) | 50 – 300 (configurable) | mm |
| Coil Turn Diameter (盘圈直径) | 100 – 2,000 | mm |
| Tube Length per Coil (单圈管长) | 0.3 – 6.0 | m |
| Total Effective Heat Transfer Length (有效换热总长) | 10 – 500 | m |
| Maximum Design Pressure (最大设计压力) | 0.5 – 6.4 | MPa |
| Maximum Operating Temperature (最高操作温度) | Up to 870 | °C |
| Surface Finish (表面处理) | BA / Pickled / 2B / Custom | — |
| End Connection Type (端部连接方式) | Welded / Flanged / Threaded | — |
| Heat Transfer Coefficient (传热系数, U) | 500 – 2,500 | W/(m²·K) |
| Applicable Vessel Volume (适用容器容积) | 1 – 200 | m³ |
| Standards Compliance (标准) | GB/T, ASME, EN, JIS | — |
Manufacturing Process
Process Flow
- Material Selection & Inspection (材料选型与检验) — Raw stainless steel seamless tubes or welded tubes are inspected for chemical composition (光谱分析), mechanical properties, and dimensional accuracy per ASTM A312 / GB/T 12771.
- Tube Cutting & Deburring (管材切割与去毛刺) — Precision cutting to specified lengths with automated deburring to ensure clean, burr-free ends suitable for welding.
- Coil Forming / Bending (盘管成型/弯曲) — Computer-controlled CNC coil forming machines produce consistent, uniform bends with controlled bend radii (typically 3D to 6D) to prevent tube ovality and wall thinning.
- Assembly & Fabrication (组装与制造) — Individual coil elements are assembled according to the half-coil (半盘管) configuration, with spacing jigs ensuring uniform pitch and proper mounting flange alignment.
- Welding (焊接) — TIG (Tungsten Inert Gas, 钨极氩弧焊) welding is employed for all joints to ensure full-penetration welds with minimal distortion. Weld procedures conform to ASME Section IX and GB/T 150.
- Surface Treatment (表面处理) — Pickling and passivation (酸洗钝化) to remove welding discoloration and restore the passive chromium oxide layer, ensuring optimal corrosion resistance.
- Non-Destructive Testing (NDT, 无损检测) — 100% visual inspection; 100% dye penetrant testing (PT, 渗透检测) on all welds; radiographic testing (RT, 射线检测) or ultrasonic testing (UT, 超声检测) as required by design specification.
- Pressure Testing (压力试验) — Hydrostatic pressure test at 1.5× design pressure (GB/T 150) or pneumatic test at 1.1× design pressure per ASME BPV Section VIII.
- Final Inspection & Certification (最终检验与认证) — Dimensional verification, surface finish measurement, and compilation of material traceability documentation and test certificates.
Key Manufacturing Advantages
- CNC-controlled forming ensures repeatability and dimensional accuracy within ±0.5 mm tolerance
- Full weld traceability with qualified welding procedures (WPS/PQR)
- In-house heat treatment capability for stress relief and grain size control
- Capability for custom geometries including spiral, helical, and segmented coil configurations
Applications
Primary Application Domains
- Chemical Processing Industry (化工行业) — Reactor cooling/heating, distillation column reboilers, heat exchange vessels for exothermic and endothermic reactions
- Pharmaceutical Manufacturing (制药行业) — Sterilization vessels, fermentation tanks, CIP (Clean-in-Place) compatible heating elements, compliance with GMP standards
- Food & Beverage Industry (食品饮料行业) — Milk pasteurization tanks, brewing kettles, juice concentration vessels, sugar syrup heating
- Petrochemical & Oil Refining (石油化工行业) — Crude oil heating coils, catalyst preparation vessels, thermal cracking reactors
- Biochemical & Biotechnology (生化与生物技术) — Bioreactor temperature control, enzyme reaction vessels, cell culture incubation systems
- Environmental Engineering (环保工程) — Wastewater treatment heating elements, flue gas desulfurization vessels
Comparative Performance Advantage (Half-Coil vs. Jacketed Vessel)
Based on comparative studies (《带夹套容器与带半盘管容器传热效率及经济性对比》), the half-coil tube configuration demonstrates significant advantages over traditional jacketed vessel designs:
- Heat Transfer Efficiency (传热效率): 30–50% improvement in overall heat transfer coefficient due to increased turbulence within the vessel and larger effective heat transfer area per unit vessel volume
- Capital Cost (资本成本): 20–40% reduction in manufacturing cost, particularly for large-diameter vessels (>2,000 mm) where jacket fabrication becomes prohibitively expensive
- Pressure Rating (压力等级): Jacketed vessels are typically limited to lower design pressures due to the jacket's structural limitations; coil tube designs maintain full vessel pressure integrity
- Scalability (可扩展性): Coil tube configurations scale linearly with vessel size without the exponential cost increase associated with jacketed designs
- Maintenance Accessibility (维护便利性): Individual coil elements can be removed and replaced without dismantling the entire vessel jacket system
Quality Certifications & Standards Compliance
Applicable Standards
- GB/T 150 — Pressure Vessel (Chinese National Standard for Pressure Vessel Design and Fabrication)
- GB/T 12771 — Stainless Steel Seamless Tubes for General Purposes
- ASME BPV Section VIII Div. 1 — Boiler and Pressure Vessel Code (Boilers and Pressure Vessels)
- ASME Section IX — Welding, Brazing, and Fusing Qualifications
- EN 13445 — European Standard for Unfired Pressure Vessels
- ASTM A312 — Stainless Steel Seamless, Welded, and Heavy-Walled Austenitic Stainless Steel Pipes and Tubes
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System Certification
- ISO 45001:2018 — Occupational Health and Safety Management System
- AS9100D — Aerospace Quality Management (for aerospace-grade applications)
Quality Assurance Documentation
- Mill Test Certificate (MTC, 材质证明书) — EN 10204 3.1 / 3.2 type
- Weld Procedure Specification (WPS) & Procedure Qualification Record (PQR)
- Non-Destructive Testing Reports (NDT Reports, 无损检测报告)
- Hydrostatic / Pneumatic Test Reports (压力试验报告)
- Dimensional Inspection Reports (尺寸检验报告)
- Material Traceability Records (材料追溯记录)
- Factory Acceptance Test (FAT) Documentation (出厂验收测试文件)
Unique Selling Points
- Superior Thermal Performance (卓越的热性能): Optimized coil geometry maximizes turbulent flow and heat transfer surface area, achieving overall heat transfer coefficients of up to 2,500 W/(m²·K) in optimized configurations
- Economic Efficiency (经济性优势): Proven 20–40% cost reduction over equivalent jacketed vessel systems while delivering 30–50% higher thermal performance
- Full Customization Capability (全面定制化能力): Custom coil geometry, spacing, material grade, and connection types tailored to specific process requirements
- Wide Temperature Range (宽温度范围): Operational capability from cryogenic (−196°C) to high-temperature (870°C) applications with appropriate material selection
- Corrosion Resistance (耐腐蚀性): Full austenitic stainless steel construction providing long-term reliability in aggressive chemical environments
- Regulatory Compliance (法规合规性): Complete compliance with GB, ASME, EN, and JIS standards for pressure vessel components
- Scalable Design (可扩展设计): Modular coil elements allow for capacity expansion and maintenance without vessel downtime