nVent RAYCHEM Skin-Effect Heat-Tracing System (STS)


The RAYCHEM Skin-Effect Heat-Tracing System (STS) is ideally suited for long transfer pipelines up to 25 km (15 miles) per circuit. Each system is custom engineered depending on the unique application type. Applications for this system include material transfer lines, snow melting and de-icing, tank foundation heating, subsea or submerged transfer lines and prefabricated, pre-insulated pipelines. When energizing an STS system, heat is generated on the inner surface of a ferromagnetic heat tube that is thermally coupled to the heat traced carrier pipe. An electrically insulated, temperature-resistant conductor is installed inside the ferromagnetic heat tube and connected to an AC voltage source in a series connection. This method of heating is called skin-effect heating because the return path of the circuit current is pulled to the inner surface (approximately 1 mm) of the heat tube by both the skin and proximity effects between the heat tube and the conductor.

 A major benefit of the RAYCHEM Skin-Effect Heat-Tracing System is that it offers the longest circuit lengths available to the industry, thereby minimizing the operating and installation costs by reducing the required number of power supply points.

 Additional Information:

  1. RAYCHEM STS can be used in Class 1 Division 2 and Zone 2 hazardous areas.
  2. The RAYCHEM STS electric heat tracing system is a technically superior, commercially attractive solution to prevent frost heave damage of LNG, LPG, ethylene, propylene and ammonia tanks.
  3. Watch this video of the RAYCHEM STS System being used in the world's longest heated and insulated pipeline (700+ km): Short Story of a Long Pipeline- Caim India- RAYCHEM STS Video

Industries Served:
Chemical and Pharmaceutical
Food and Beverage
Oil and Gas

Technical Specifications

  1. The heating system shall consist of an electrically insulated, temperature-resistant conductor with high temperature, heavy-walled fluoropolymer insulation installed inside a heat tube.
  2. The heat tube shall be ferromagnetic and thermally coupled to the carrier pipe that is being traced.
  3. The engineered Skin-Effect system must be designed by the system manufacturer.
  4. The Skin-Effect system installation should be supervised by the system manufacturer.
  5. Skin-Effect Heat-Tracing systems should be able to maintain temperatures up to 200°C (392°F) and be able to power circuit lengths up to 25 km (15 miles).

For detailed product specifications, please refer to the Industrial Heat-Tracing Specification document provided in the Documentation link shown to the left.


Forms & Worksheets
Additional References
Connection and Protection