1. Product Overview

High-pressure superheater serpentine tubes are key pressure components of boiler heating surface systems. They are typically arranged in the high-temperature convective zone of the boiler flue gas path and are used to further heat saturated steam to the required superheated steam temperature, ensuring stable steam supply for steam turbines or downstream process systems.

The serpentine multi-pass tube configuration effectively extends the heat transfer path within limited space, improving convective heat transfer efficiency on the flue gas side. The product is widely applied in utility boilers, industrial boilers, and heat recovery steam generator (HRSG) systems.

2. Structural Features

• Serpentine Multi-Pass Design
  Tubes are arranged in a regular serpentine pattern, providing long heat transfer paths and high thermal efficiency under high-temperature flue gas conditions.

• Designed for High-Pressure Service
  The structural design meets the operating requirements of medium-to-high and high-pressure boilers, suitable for long-term high-temperature and high-pressure operation.

• Standardized End Connections
  Tube ends are prepared in accordance with header (manifold) connection requirements and are suitable for full-penetration butt welding, ensuring reliable installation and pressure integrity.

• Good Thermal Stress Adaptability
  The serpentine configuration effectively accommodates thermal expansion, reducing thermal stress and improving long-term operational stability.

3. Materials and Manufacturing Process

• Typical Materials

  • ASME / ASTM: SA-213 T22, T91, T12

  • GB standards: 12Cr1MoVG, 15CrMoG and other heat-resistant alloy steels

• Manufacturing Process

  • Cold bending or controlled hot bending

  • Strict control of bending radius and ovality

  • Tube ends beveled according to standards and protected with end caps

• Quality Control

  • Full traceability of raw materials

  • Dimensional and visual inspection of bent tubes

  • Material Test Certificates (MTC) available upon project requirements

4. Typical Applications

• High-pressure superheaters in utility boilers

• Convective heating surfaces in industrial boilers

• Steam systems in HRSG units

• High-temperature steam systems in coking, chemical, and energy recovery plants

5. Product Advantages

• Suitable for continuous high-temperature and high-pressure operation

• Compact structure with high heat transfer efficiency

• High manufacturing precision and good installation consistency

• Customizable design and fabrication based on project operating conditions

6. Product Positioning Statement

High-pressure superheater serpentine tubes are classified as boiler pressure parts. They are designed and manufactured to meet stringent requirements for safety, reliability, and long-term operation in boiler systems, and are fundamentally different from general heat exchanger coils or ordinary bent tubes.