Key Points for Preventing Freezing and Condensation in Chemical Plants (IV. Precautions)

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1. Drawing on past experience with freezing issues, it is necessary to address any such problems that arise. Prepare appropriate anti-freezing materials, such as insulation materials, check valves, flexible metal hoses, temporary connectors, and anti-freezing gloves. 2. Put various anti-freezing measures into use in advance before winter arrives, to allow sufficient time to address any anti-freezing issues and prevent sudden temperature drops from preventing the implementation of such measures. 3. Adjust the heat supply in a timely manner to meet the anti-freezing requirements, while avoiding waste caused by excessive heat supply, as well as issues such as exceeded process parameters and inaccurate instrument readings. 4. For material pipelines with heating, there should be a defined direction for expansion, in order to prevent pressure buildup in the equipment or pipelines due to the expansion of the material when it is heated. If pressure gauges are installed, it is necessary to monitor their readings regularly. 5. When the material pipeline is in operation and flowing, the heat tracing pipeline heats the material pipeline it is intended to heat; if the flow of material in the pipeline stops, a thorough inspection should be carried out and the heat tracing intensity should be increased as appropriate. 6. The heating temperature of the eye washer should be appropriate; excessive heating temperatures should be avoided to prevent additional injuries in emergency situations. 7. When hot water or steam heating needs to be temporarily shut down for maintenance purposes, care should be taken to prevent the heating pipes and the pipelines carrying the material being heated from freezing and becoming blocked. 8. For equipment equipped with heating systems that requires heat dissipation during operation, the insulation should be removed, the heating system should be adjusted to a lower level, or it should be turned off, in order to prevent the equipment from overheating. 9. When using electric heating, attention should be paid to the load on the heating strip to prevent overload-induced shutdowns or fires ； To carry out maintenance on electric heat tracing, the power supply must be turned off first; during the maintenance period, measures should be taken to prevent the materials being heated from freezing. 10. If any abnormalities are detected in the steam tracing drainage system, such as water hammer, excessive or insufficient drainage volume, or inadequate heating from the tracing, prompt action should be taken to address them. 11. Adopt a circulating anti-freezing method; while meeting the anti-freezing requirements, minimize the circulation volume to avoid unnecessary waste caused by an excessive circulation volume. 12. Similar to fire valve shafts, when underground valves are closed, tools for opening the shaft covers and valves should be available to ensure they can be used promptly in emergency situations. 13. Eliminate any leaks or spills at the site promptly to prevent ice formation on the ground and in the air; if such occurrences do happen, they must be dealt with immediately. 14. Conduct regular anti-freezing inspections to ensure their quality, while carrying out inspections focusing on key areas based on different times, temperature conditions, and the difficulty of preventing freezing.