Asphalt tanks are prone to aging, hard asphalt deposition, corrosion, heat loss, and leakage after long-term high-temperature operation. Regular cleaning, effective daily maintenance, and professional repair are essential to ensure safe use, prolong service life, and maintain heating efficiency. This article summarizes the complete process and technical points for reference.

1. Asphalt Tank Cleaning Technology

Before cleaning, the residual asphalt in the tank should be discharged at high temperature. For hardened old asphalt, high-temperature hot oil circulation or local heating can be used to soften it first. Mechanical cleaning with high-pressure water jets, scrapers, or vibrating tools is suitable for large areas of attachments. Chemical cleaning with asphalt dissolving agents is used for stubborn residues in pipelines and corners.

After cleaning, the tank surface must be washed and dried thoroughly to remove oil, sludge, and rust, creating good conditions for maintenance and anti-corrosion treatment.

2. Routine Maintenance of Aging Asphalt Tanks

Check the thermal insulation layer regularly. If it is damaged, damp, or fallen off, repair it in time to avoid rapid temperature drop and increased energy consumption. Inspect heating pipes, flanges, valves, and welding seams for asphalt leakage or blockage, and dredge or replace them immediately.

Test temperature sensors, level gauges, and safety valves to ensure accurate readings and flexible actions. Clean the burner, heat exchanger, and flue to maintain high heating efficiency. Strengthen daily sealing management to prevent rainwater from entering the tank and causing asphalt emulsification and deterioration.

3. Common Repair Technologies for Aging Tanks

For mild corrosion and small areas of rust, use sandblasting or polishing to remove rust, then apply high-temperature anti-corrosion coatings. For local corrosion pits and micro-leakage points, plugging agents or patch welding can be used under professional operation.

Severe corrosion or deformation requires partial plate replacement or overall reinforcement. Leakage in the heat conduction oil pipeline must be repaired by professional welding to avoid fire risks. The insulation layer should be reconstructed with high-temperature resistant materials to restore thermal insulation performance.

4. Safety Requirements in Cleaning and Repair

All cleaning and repair operations must be carried out after cooling, power cut-off, and ventilation. Open flames are strictly prohibited in the tank area. Operators should wear anti-scald, dust-proof, and gas-protective equipment. Before entering the tank, harmful gas detection and forced ventilation must be conducted to prevent poisoning or suffocation.

5. Summary

Aging asphalt tanks can be restored to good working conditions through scientific cleaning, standardized maintenance, and targeted repair. Reasonable maintenance can reduce energy consumption, avoid sudden failures, and extend the service life of asphalt tanks by more than 5–10 years. For severely aged tanks with potential structural risks, overall replacement is recommended to ensure construction safety.