, and reduce equipment scrap loss.
Electric heating tubes must be stored in a dry and ventilated environment for a long time, and humid and closed storage spaces are prohibited. The internal sealing silica gel and magnesium oxide insulation sand of the new electric heating tube have good sealing and insulation performance, but long-term placement in humid air will lead to moisture adsorption on the tube port and internal insulation materials, resulting in decreased insulation resistance. Dry storage can keep the internal insulation environment stable, maintain the standard insulation resistance of ≥1MΩ, and ensure that the equipment can be used normally after taking out.
For electric heating tubes with reduced insulation resistance after long-term placement, professional repair measures can be adopted to recover performance. When the insulation resistance is lower than 1MΩ due to moisture absorption, high-temperature drying treatment is the most effective repair method. The electric heating tube can be placed in a constant temperature oven at about 200℃ for drying. The high-temperature environment can evaporate the internal adsorbed moisture, restore the insulation performance of magnesium oxide sand and sealing components, and make the insulation resistance return to the standard range.
In addition to oven drying, low-voltage electrified heating restoration can also be used for insulation repair. For electric heating tubes without drying equipment conditions, low working voltage can be applied for electrified heating. The low-temperature heat generated by low-voltage operation can slowly evaporate internal moisture, avoiding local high-temperature damage to internal components caused by direct high-voltage heating. The voltage can be gradually increased with the recovery of insulation resistance until the performance is completely restored, which is convenient and efficient for on-site fault repair.
The sealing protection of the wire outlet end is the key to prevent insulation failure. The magnesium oxide powder at the outlet end of the electric heating tube is the core insulation and heat conduction material. Once contaminated by dust, impurities and moisture, the insulation performance will decrease sharply, easily causing electric leakage accidents. Therefore, during storage and use, the outlet end must be protected to avoid pollutant and moisture infiltration. Scientific storage and targeted fault repair can effectively extend the service life of electric heating tubes, reduce equipment maintenance costs, and improve the cost performance of product use and foreign trade product quality.
