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Maintenance and repair: Pressure vessels are prone to explosions and fires due to factors such as sealing issues, pressure resistance, and the type of medium used, which can endanger the safety of people, equipment, and property as well as cause environmental pollution. Therefore, to ensure the safe operation of chemical plants, the quality of routine maintenance and inspection of pressure vessels is of particular importance. At the same time, the quality of routine maintenance and inspection of pressure vessels lays a solid foundation for the safe, stable, long-term, efficient, and optimal operation of the facility. Regular inspections should focus on the following aspects: ① Cracks, overheating, deformation, leaks, and damage to the pressure vessel itself, its connections (valves, pipelines), and welding joints ； ② Corrosion of the outer surface ； ③ The insulation layer is damaged, detached, damp, or allows heat loss ； ④ Abnormal vibration and noise of pressure vessels along with adjacent pipes or components, as well as mutual friction between them ； ⑤ Damage to supports or bearings, settlement, tilting, and cracking of foundations, condition of fastening bolts ； ⑥ Discharge (hydrophobic, waste) device ； ⑦ Stability of operation ； Are there any instances of overheating, overpressure, or overload operation? ； ⑧ Are the grounding facilities of the pressure vessel in good condition? ； ⑨ Monitoring measures and abnormal conditions for pressure vessels with a safety status level of 4. Abnormal phenomena: When a pressure vessel exhibits any of the following abnormal phenomena, the operator must immediately take emergency measures and report to the relevant authorities as required: ① The operating pressure, medium temperature or wall temperature, or certain corrosive components in the medium exceed the allowable values, and effective control cannot be achieved despite taking measures ； ② The main pressure-bearing components develop safety-threatening defects such as cracks, bulging, deformation, and leakage ； ③ Failure of safety accessories ； ④ Takeover, damaged fasteners; it is difficult to ensure safe operation ； ⑤ A fire has occurred, posing a direct threat to the safe operation of the pressure vessel ； ⑥ overfilling ； ⑦ The liquid level is out of control, and measures taken fail to bring it under effective control ； ⑧ Severe vibration in pressure vessels and pipelines endangers safe operation ； ⑨ Other abnormal conditions. Regular maintenance: 1. The user unit should, in conjunction with equipment organization and repair, regularly address and eliminate issues such as leaks from containers, as well as poor sealing. Furthermore, anti-corrosion and insulation measures should be applied to the container on a regular basis, depending on its condition; the main bolts of the container should be lubricated regularly, and other bolts and fasteners should also undergo anti-rust treatment periodically. 2. Containers that are out of use, sealed up, or kept as spares should be regularly inspected and maintained, and measures taken for the \"four protections\" (protection against freezing, dust, moisture, and corrosion). Emergency handling: In the event of any of the following abnormal conditions, the operator is authorized to take emergency measures and report them promptly: a. When the operating pressure of the container, the temperature of the medium inside, or the temperature of the container walls exceeds the specified values, or when the container is operating under overload conditions and such conditions cannot be effectively controlled despite taking measures ； b. Defects that pose a safety risk to the main pressure-bearing components of a container, or to containers used for storing flammable, explosive, hazardous, or moderately toxic substances, such as cracks, bulges, deformation, and leaks ； c. When a fire breaks out at the location where the container is situated, or an accident occurs with adjacent equipment that directly endangers the safe operation of the container ； d. When overfilling of the container endangers safety ； e. When the nozzles and fasteners of the container are damaged, making it difficult to ensure its safe operation ； f. When the liquid level in the container gets out of control and measures taken fail to bring it under effective control ； g. When the container vibrates in conjunction with adjacent pipes, posing a threat to the safe operation of the container ； h. The safety device has failed and cannot be adjusted, posing a threat to safe operation ； i. Other situations occur where, according to the safety production technical regulations, the container is not allowed to continue operating.