Key points for waterproofing and moisture-proof of electric heating belt

Long term placement of electric heat tracing in tube wells, open air, and underground humid environments can reduce the insulation of power lines due to water vapor infiltration, causing various operational hazards such as tripping and short circuits. Proper waterproof and moisture-proof treatment throughout the entire process, controlling construction and protection details, can prevent damage to the circuit caused by moisture and extend the service life of the entire heat tracing system.

Priority should be given to matching moisture-proof and waterproof specifications during the selection stage. Ordinary indoor drying pipelines can choose single-layer sheathed heat tracing cables, while underground pipe galleries and outdoor sprinkler areas must use double-layer overall waterproof structure cables. For chemical wastewater and long-term condensation conditions, fluoroplastic outer sheath products are selected. The outer sheath is dense and impermeable, which can resist continuous erosion by water vapor. The explosion-proof area is equipped with a heat tracing belt with a sealed shielding layer to prevent moisture from infiltrating the interior of the shielding layer and burying potential leakage hazards. Do not use ordinary indoor cables instead of waterproof ones, as insulation degradation may occur during short-term use.

Reduce the infiltration of water vapor into the channel during the laying process. Before construction, clean the accumulated water and damp rust on the pipe wall to ensure that the laying surface is dry. Wet pipes should be air dried before wiring. Try to avoid water accumulation at the bottom of the pipeline for cables, and raise the wiring position appropriately for water prone points such as valves and flanges. When bending cables, avoid cracking or damaging the sheath. Any small cracks on the outer layer can become a water inlet channel, and damaged cables cannot be directly put into use. The entire process is fixed with pressure-sensitive tape without leaving any gaps, reducing the infiltration of water vapor from the gap between the cable and the pipe wall.

The joint and terminal are key locations for moisture prevention, and the sealing process cannot be simplified. The power box, two-way junction, and terminal head are all equipped with waterproof sealing accessories, and the box is filled with special sealant to prevent water vapor from entering the internal core without leaving any gaps. The wiring operation must be completed in a dry environment, and the wire ends must not have water stains. After the connection is completed, let it stand and wait for the sealant to cure before wrapping it with an outer layer for insulation. All wiring points of outdoor pipelines are additionally wrapped with waterproof tape for secondary sealing, double blocking rainwater and dew penetration.

The outer insulation and protective layer should be well protected against water. Thermal insulation cotton should not directly come into contact with rainwater. The outer layer of the insulation layer should be completely wrapped with waterproof rolls or rainproof outer skin, and the joints should be overlapped, compacted, and sealed. Install waterproof shells on the outer insulation layer of pipe trenches and underground pipelines to prevent groundwater from soaking the insulation layer. Damaged insulation and timely repair of opening positions can cause water vapor retention inside the insulation, which will continue to corrode the cable sheath. Prolonged exposure to moisture can easily lead to line failures.

Regularly check the moisture-proof status during daily operation and maintenance. The inspection focuses on checking whether there is water leakage in the junction box and whether there are any signs of damage or water ingress on the insulation skin. If there is water accumulation or moisture regain, it should be promptly opened and dried, and resealed. Before the rainy season, conduct a comprehensive inspection of the waterproof protective layer of outdoor pipelines and repair any cracks or leaks. Old line sealant is aging and cracking. Replace sealing accessories in a timely manner to prevent moisture from continuously entering the interior of the line.

From selection, construction sealing to outer layer protection, implementing moisture-proof measures and blocking all water infiltration points can effectively prevent the circuit from being affected by moisture and leakage, reduce the frequency of fault maintenance, and ensure the stable and anti freezing operation of the electric heating system throughout the year.