SPIRAL CRIMPED FIN TUBE TECHNICAL SPECIFICATION

1. Manufacturing Process

The spiral crimped fin tube production involves three key stages:

• Base Tube Preparation: Seamless/carbon steel tubes are precision-cut to required lengths (typical tolerance ±0.5mm)
• Fin Formation:
  • Spiral fins are cold-formed onto tubes using specialized crimping machines (rotation speed 50-200 RPM)
  • Fin pitch ranges from 2.5-12.7mm with height 6.5-16mm
  • Crimping angle maintained at 30°-45° for optimal heat transfer
• Fin Bonding:
  • Mechanical bonding through pressure up to 3.5 tons
  • Optional brazing/soldering for high-pressure applications

2. Material Options

ComponentAvailable MaterialsTemperature RangeBase TubeCarbon steel (ASTM A179), Stainless (304/316), Copper (C12200)-40°C to 650°CFinsAluminium (6063), Copper (C11000), Carbon steel-200°C to 580°C

3. Technical Specifications

• Standard Sizes:
  • OD: 12.7mm – 50.8mm (0.5″ – 2″)
  • Length: Up to 12m (custom lengths available)
  • Fin thickness: 0.3mm – 1.2mm
• Performance Metrics:
  • Heat transfer coefficient: 35-60 W/m²K
  • Pressure rating: Up to 4.0MPa (with brazed fins)
  • Surface area expansion ratio: 5:1 to 12:1

4. Industrial Applications

1. Power Generation:
   • Boiler economizers (coal-fired plants)
   • HRSG (Heat Recovery Steam Generators)
2. Process Industries:
   • Oil refinery heat exchangers
   • Chemical reactor cooling systems
   • LNG vaporizers
3. HVACR Systems:
   • Industrial chillers
   • Heat pump evaporators
   • District heating networks
4. Specialty Applications:
   • Marine engine cooling
   • Waste heat recovery units
   • Solar thermal collectors

Spiral Crimped Fin Tube Installation Manual‌‌

 Pre-Installation Preparation

1. ‌Material Verification‌

   • Confirm base tube material markings (ASTM A179/A214 carbon steel, 304/316 stainless steel, or copper alloy) match design specifications.
   • Measure fin parameters:
     • Fin height tolerance ≤ ±0.2mm
     • Spiral angle deviation ≤ ±1.5°
     • Fin pitch error ≤ ±0.3mm

2. ‌Surface Treatment‌

   • Clean internal tubes using compressed air (0.6MPa pressure).
   • Apply anti-oxidation coating (recommend PTFE-based coating) for aluminum fins.

 Mechanical Installation Procedure

‌1. Support System Installation‌

‌2. Tube Bundle Connection‌

• ‌Flange Connection‌:

  • Bolt preload control:
    • M12 bolts: 35-40Nm
    • M16 bolts: 70-80Nm
  • Use graphite metal-wound gaskets as priority.

• ‌Welding Connection‌:

  Welding Type	Application
  TIG Welding	Stainless steel/copper alloy tubes
  MIG Welding	Carbon steel tubes (argon purging required)

  Post-weld Eddy Current Testing (ECT) mandatory for joint integrity verification.

‌3. Fin Protection Measures‌

• Installation deformation control:
  • Radial compression ≤5% of fin height
  • Axial twist angle ≤3°
• For corrosive environments:
  • Apply epoxy protective coating (dry film thickness ≥150μm).

System Commissioning Protocol

‌Pressure Testing Procedure‌:

1. Hydrostatic test: 1.5× working pressure, hold for 30 minutes (leakage rate ≤0.1%).
2. Gas tightness test: 0.6MPa nitrogen with soap solution for leak detection.

‌Thermal Debugging Parameters‌:

 Maintenance Regulations

• ‌Periodic Inspections‌:
  • Monthly visual inspection of fin fouling (permissible dust accumulation ≤1mm).
  • Annual ultrasonic thickness testing (replace if wall loss ≥10%).
• ‌Chemical Cleaning‌:
  • Acidic solution pH control:
    • Carbon steel: 4.5-5.5
    • Stainless steel: 2.8-3.2.

This manual complies with ASME B31.1 Power Piping Code and applies to heat exchange systems with working pressure ≤10MPa.

Annotations marked with [ ] refer to relevant clauses in international engineering standards.

Key Technical Clarifications:

1. ‌Fin Height Tolerance‌: Critical for maintaining uniform airflow and heat transfer efficiency.
2. ‌Welding Gas Protection‌: Argon shielding prevents oxidation in carbon steel tube welding.
3. ‌Epoxy Coating Thickness‌: 150μm ensures corrosion resistance in pH 3-11 environments.