What are the key points in chimney tower maintenance and care?
I. Key Points in Chimney Tower Maintenance and Care
1. Regular Inspection and Monitoring
- External Inspection: Conduct a visual inspection at least once a quarter, focusing on cracks, rust, and deformation on the tower surface. According to the "Design Code for Industrial Chimneys" (GB 50051-2013), cracks wider than 0.3mm require immediate repair.
- Internal Inspection: Use drones or climbing equipment to inspect internal wall corrosion annually, especially for chimneys emitting corrosive gases. Replace the lining if the damage rate exceeds 15%.
- Settlement Monitoring: Install an inclinometer or GPS device to monitor tower settlement. The allowable tilt should not exceed 1/500 of the height (e.g., a 100-meter chimney should tilt less than 20cm).
2. Anti-corrosion and Rust Treatment
- Coating Maintenance: Reapply high-temperature anti-corrosion coating (such as epoxy or silicate) every 3-5 years, with a coating thickness of 150-200μm.
- Cathodic protection: Applicable to metal chimneys, it uses sacrificial anodes or impressed current methods to mitigate electrochemical corrosion. The protection potential must be controlled between -0.85V and -1.2V (refer to NACE standards).
II. Maintenance of Key Ancillary Equipment
1. Lightning Protection System
- Before the annual thunderstorm season, check the grounding resistance. The resistance should be less than 10Ω (GB 50057-2010). Lightning rods with rust exceeding 30% should be replaced.
2. Ladders and Platforms
- Check welds for cracks. The platform's load-bearing capacity must meet the design load (usually ≥3kN/m²). Severely corroded components should be replaced promptly.
III. Emergency Management and Special Environment Response
1. Extreme Weather Plan
- Reinforce cables before typhoons (e.g., when the wind speed warning is ≥12) and check for loose anchor bolts. In winter, prevent icing that could overload the structure.
2. Emission Adaptability Maintenance
- If the emissions contain corrosive components such as sulfides, the lining inspection cycle should be shortened to six months, and acid-resistant bricks or titanium-steel composite plates should be used for lining.
