Precautions for inspection of electric heating belt during rainy season

During the rainy season, the humidity is high and rainfall is frequent. Wet conditions can easily cause water ingress into the insulation of the electric heating belt, moisture in the cables, and seal failure, leading to various hidden exchanges such as electrical leakage and heating attenuation. Implementing regular inspections during the rainy season and identifying potential hazards in advance is the key to ensuring the stable operation of the heat tracing system.

The inspection of insulation and outer protective layer is of utmost importance in rainy season inspections. The outdoor insulation outer protective layer is prone to cracking, peeling, water seepage and other problems due to long-term rainwater erosion. After rainwater seeps into the insulation layer, it is difficult to dry and will continue to wrap around the heat tracing belt, causing corrosion of the sheath and a decrease in insulation performance, which is likely to trigger faults such as leakage tripping. During the inspection, it is necessary to inspect each section and promptly repair the damaged areas. Insulation layers that are severely affected by moisture should be replaced directly to eliminate the risk of water ingress from the source.

The appearance inspection of cables cannot be ignored. The high humidity and rainy environment will accelerate the aging, cracking, and peeling of the heat tracing jacket, and the probability of failure in easily worn areas such as pipe bends, brackets, and flanges is higher. Daily inspections require careful inspection of the cable status, checking for water immersion, whitening, hardening, damage, and other issues. Any damage found should be rectified in a timely manner to prevent moisture from entering the core and causing line faults.

The electrical wiring location is a high-risk inspection point during the rainy season. The junction box, terminal head, temperature control port and other positions are not sealed tightly, and rainwater and moisture are easily infiltrated, causing short circuits, leakage, and contact oxidation. It is necessary to focus on checking whether the explosion-proof junction box rubber ring and cover are tight, whether there is water accumulation, condensation, and mold inside, and ensure that all electrical interfaces are sealed properly to prevent moisture damage.

The temperature control equipment installed outdoors should also be maintained with emphasis. Regularly check the integrity of the waterproof casing of the thermostat and probe, clean the surface of accumulated water and stains, and check whether the wiring ports are loose and damp. Ensure accurate temperature measurement and sensitive start stop to prevent equipment from becoming damp and malfunctioning, resulting in abnormal start stop or malfunction of the heat tracing system.

During the rainy season, it is necessary to increase the frequency of insulation resistance testing appropriately. Under humid conditions, the appearance of the equipment appears intact, but the internal insulation value is likely to be low, posing hidden safety hazards. Regular power-off retesting of insulation data is required. For circuits with values that do not meet the standards, moisture and damage points should be checked one by one. Only after rectification is qualified can the equipment be put into use. It is strictly prohibited to operate the equipment with hidden dangers.

At the same time, it is necessary to carry out on-site drainage and dredging work. Pipe galleries, low-lying pipelines, and equipment bases are prone to accumulation of water, and long-term immersion can accelerate cable corrosion and aging. During inspections, timely clear drainage channels, remove accumulated water and silt, keep the laying area dry and ventilated, and reduce equipment damage caused by water immersion.

In summary, the core of the rainy season tropical inspection revolves around waterproofing, moisture resistance, and leakage prevention. By focusing on key aspects such as insulation protection, wiring sealing, cable status, and insulation testing, and regularly investigating and rectifying hidden dangers, we can basically avoid frequent failures during the rainy season and ensure the smooth operation of the electric heating system.