Key points for preventing heat tracing belts from being damaged by high temperatures

Electric heat tracing belts are mostly suitable for low-temperature antifreeze conditions, but their high-temperature resistance is limited. Long-term exposure to high-temperature heat sources can easily lead to issues such as sheath softening and insulation breakdown. In on-site construction and operation and maintenance, high-temperature burns are a common cause of failure, which can easily lead to various operational hazards and shorten equipment service life. Mastering the key points of protection is crucial for the stable operation of the system.

Selection and matching of operating conditions is the first line of defense against high-temperature damage. Different types of heat tracing belts have vastly different temperature resistance levels. Ordinary civilian self-regulating heat tracing belts have a lower temperature resistance and are only suitable for conventional water supply and drainage, as well as freeze protection of fire protection pipelines, and cannot be adapted to high-temperature process pipelines. Many on-site high-temperature damage accidents are caused by incorrect selection, where ordinary cables are used on the outer walls of high-temperature equipment, leading to issues such as sheath melting, core carbonization, and line scraping in a short period of time. In high-temperature process scenarios, it is necessary to use high-temperature resistant dedicated constant power or MI mineral insulated heat tracing belts that match the operating temperature of the equipment.

During the construction phase, it is essential to ensure proper heat source isolation and protection. Steam tracing and high-temperature process pipelines have extremely high external wall temperatures. If the tracing band is directly attached and laid, it will be continuously exposed to high temperatures. During construction, it is necessary to install thermal insulation spacers and high-temperature resistant isolation layers between the pipeline and the tracing band to block high-temperature heat conduction and prevent the cables from being exposed to excessive temperatures for extended periods. Additionally, it is strictly prohibited to lay the tracing band directly on high-temperature components such as boilers, heaters, and heat exchangers. A safe distance for heat dissipation should be reserved.

To prevent man-made high-temperature damage caused by cable overlap and heat accumulation. In daily construction, when excess cables are overlapped, twisted, and piled up, the heat cannot dissipate after the outer insulation is sealed, resulting in localized high-temperature areas. This internal heat accumulation temperature far exceeds the ambient temperature, and long-term operation will continuously burn the heat tracing belt sheath, causing material aging and cracking, as well as insulation degradation. Standardizing straight laying, reserving reasonable spacing, and maintaining smooth heat dissipation can effectively avoid heat accumulation and high-temperature damage.

Reasonably control temperature control parameters to avoid overtemperature operation of equipment. Some sites, in order to enhance the heat tracing effect, privately adjust the temperature control temperature to high levels, resulting in long-term full-load and over-limit temperature operation of the heat tracing belt. Frequent overtemperature operation will accelerate the attenuation of PTC materials, damage the internal insulation structure, and cause premature aging and damage of cables. Standard temperature should be set according to the pipeline anti-freezing and temperature maintenance requirements, to prevent blind high-temperature operation and reduce equipment heat loss.

Promptly rectify insulation and overheating hazards. Damage to the insulation layer leading to water ingress, excessive sealing, and poor ventilation can all result in localized heat accumulation, creating a sealed high-temperature environment. Especially during summer when the ambient temperature rises, the internal temperature of the sealed insulation layer can soar significantly, far exceeding the tolerance range of the cables, leading to thermal aging damage. Regular inspection of the insulation layer status, appropriate optimization of ventilation conditions, and timely repair of water accumulation and sealing hazards can mitigate high-temperature losses.

Ensure proper maintenance and inspection during summer shutdown. During high-temperature seasons, there is no need to use the heat tracing system. It should be powered off and shut down in a timely manner to avoid hidden high-temperature damage caused by exposure to the sun without load and standby with power on. Regularly inspect the cable sheath for signs of aging such as softening, stickiness, and discoloration due to high temperature. Replace any cables with minor high-temperature damage in a timely manner to prevent the failure from escalating.

Most high-temperature damages in heat tracing systems stem from improper selection, non-standard construction, and omissions in operation and maintenance, all of which can be avoided in advance. Implementing measures such as adapting selection to working conditions, providing thermal insulation and protection, laying in accordance with standards, and precise temperature control can effectively resist high-temperature damage, delay equipment aging, and ensure the long-term safe and stable operation of electric heat tracing systems.