Shell and Coil Tube Heat Exchanger — Coiltube Series

Product Overview

The Shell and Coil Tube Heat Exchanger (Coiltube Series) is a high-performance thermal management component manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product employs a helically wound coil tube configuration housed within a pressure-resistant shell vessel, delivering exceptional heat transfer efficiency through a compact and mechanically robust design. The coiltube geometry inherently generates turbulent flow characteristics, significantly enhancing convective heat transfer coefficients compared to conventional straight-tube heat exchangers. This product line is engineered for demanding industrial environments where corrosion resistance, thermal efficiency, and long-term reliability are paramount.

Material & Properties

The coil tubes are fabricated from premium-grade stainless steel alloys and titanium (Ti) grades, selected for superior resistance to chemical attack, thermal cycling fatigue, and mechanical stress. The following material options are available:

Key material properties include:

Specifications

Parameter Specification Standard / Reference
Product Category Shell and Coil Tube Heat Exchanger (壳盘管式换热器) GB/T 151, TEMA
Coil Tube Outer Diameter (OD) 12 mm – 32 mm ISO 3505
Coil Tube Wall Thickness 1.0 mm – 3.0 mm ASTM A213 / ASTM B338
Coil Pitch (螺旋节距) 25 mm – 60 mm (customizable) Manufacturer specification
Coil Length (盘管长度) Up to 150 m per coil —
Shell Material Carbon Steel (CS), SS304, SS316L, or Titanium ASME BPVC Section VIII
Heat Transfer Surface Area 1 m² – 500 m² —
Operating Pressure (Shell Side) 0.1 MPa – 4.0 MPa GB/T 151
Operating Pressure (Tube Side) 0.1 MPa – 2.5 MPa GB/T 151
Operating Temperature -40°C to 400°C —
Heat Transfer Coefficient (U) 500 – 2,500 W/(m²·K) Dependent on fluid properties
Design Standards GB/T 151, ASME BPVC, TEMA R-Type —
Flange Standard GB/T 9119, ASME B16.5, EN 1092 —
Welding Method TIG (GTAW), Orbital Welding, Resistance Welding ISO 6947, AWS D10.9

Manufacturing Process

The production of the Coiltube Series heat exchanger follows a rigorous multi-stage manufacturing protocol to ensure dimensional accuracy, metallurgical integrity, and thermal performance:

  1. Raw Material Inspection (原材料检验): Incoming coils are verified for chemical composition (spectroscopic analysis), mechanical properties (tensile and hardness testing), and dimensional conformity per applicable ASTM or GB standards.
  2. Coil Winding (盘管绕制): Precision CNC-controlled winding machines form the helical coil geometry with controlled pitch, diameter, and turn-to-turn spacing. The winding process is performed at ambient or slightly elevated temperatures to minimize residual stress.
  3. Stress Relief Annealing (去应力退火): The wound coil undergoes controlled thermal treatment (typically 850–950°C for stainless steel; 600–700°C for titanium) followed by slow cooling to relieve internal stresses and restore full ductility.
  4. Shell Fabrication (壳体制造): The pressure shell is formed from seamless pipe or plate, featuring flanged nozzles, manways, and inspection ports. Internal supports (coil holders, baffles) are fabricated to position the coil with uniform clearance.
  5. Assembly & Welding (组装焊接): The coil tube is inserted into the shell vessel. Connection points are welded using Gas Tungsten Arc Welding (GTAW/TIG) with inert gas shielding (argon or argon-helium mixtures) to prevent oxidation. Orbital welding may be employed for automated, repeatable weld quality.
  6. Pressure Testing (压力试验): Hydrostatic pressure testing is conducted at 1.5× the design pressure (per ASME BPVC Section VIII Div. 1) to verify structural integrity and weld soundness.
  7. Non-Destructive Testing (无损检测): Radiographic Testing (RT), Ultrasonic Testing (UT), and Dye Penetrant Testing (PT) are performed on critical welds and coil joints to detect subsurface or surface defects.
  8. Surface Treatment & Passivation (表面处理与钝化): All exposed stainless steel and titanium surfaces undergo acid pickling and passivation to remove welding discoloration and establish a protective chromium oxide layer.
  9. Final Inspection & Documentation (最终检验与文件): Complete traceability documentation, including material test certificates (MTCs), weld maps, NDT reports, and pressure test records, is compiled per project requirements.

Applications

The Shell and Coil Tube Heat Exchanger is deployed across a broad spectrum of industrial sectors where efficient heat exchange in corrosive or high-pressure environments is required:

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring compliance with international and national standards:

Unique Selling Points

1. Superior Heat Transfer Efficiency: The helical coil geometry induces secondary flow patterns (Dean vortices), increasing the Nusselt number by 20–40% compared to straight tubes at equivalent Reynolds numbers, thereby reducing required heat transfer area and equipment footprint.

2. Compact & Scalable Design: High surface-area-to-volume ratio enables compact installations, with modular scalability from laboratory-scale (1 m²) to industrial-scale (500 m²) units.

3. Enhanced Fouling Resistance: Elevated fluid velocities within the coil channels minimize fouling deposition rates, extending cleaning intervals and reducing operational downtime.

4. Corrosion-Resistant Material Options: Available in titanium (TA2), duplex stainless steel (2205), and super-austenitic grades (904L, C-276), enabling deployment in the most aggressive chemical environments.

5. Full Traceability & Compliance: End-to-end material traceability from mill certificate to final assembly, with comprehensive NDT and pressure testing documentation meeting ASME, TEMA, and PED requirements.