What are the precautions during maintenance?

First of all, your question is too general. Safety comes first when carrying out maintenance work; the following points can serve as a reference: 1. Establish a safety maintenance leadership team in the workshop, with the top manager of the organization serving as the team leader, thereby implementing a system of responsibility under the leadership of the top manager. 2. All units participating in the maintenance work must conduct a safety training session for all employees prior to starting the work, explaining the safety considerations related to each item and each step outlined in the safety plan for the maintenance tasks. Responsibilities must be assigned to specific teams and individuals. Before carrying out each maintenance task, the person in charge must provide a \"five-point briefing,\" which includes explaining the tasks to be performed, the safety measures to be taken, the safe methods of work, the potential safety hazards to be aware of, and the relevant regulations that must be followed. Eliminate the occurrence of the \"three violations,\" namely: giving illegal instructions, carrying out illegal operations, and violating labor discipline. Achieve the \"four no-harms\": do not harm oneself, do not harm others, do not allow oneself to be harmed by others, and do not allow others to be harmed. 3. All teams must strictly implement the shutdown plan to carry out a orderly shutdown. Thoroughly replace, purge, and wash towers, vessels, pipelines, etc., to ensure that there is no oil, water, or vapor remaining inside the pipelines and equipment; simultaneously, completely clean up any oil stains from the floors, surface drains, and sewers. It is strictly prohibited to discharge oil products, sewage, liquefied gas, toxic and harmful gases, etc. arbitrarily. All sewer covers and floor drains within the enclosed area must be sealed to eliminate potential safety hazards; responsibilities must be assigned to specific individuals, and relevant records must be kept. 4. Before shutting down, check that all fire-fighting equipment is in good condition and ready for use. During maintenance, ensure that the fire roads within the factory area are unobstructed and that there is sufficient water pressure for firefighting, just in case. 5. All personnel entering the maintenance site must wear the required personal protective equipment, especially safety helmets, work uniforms, safety belts, etc. Those who fail to comply with safety regulations or do so inadequately and cause accidents shall bear the consequences themselves, and the unit leaders and those responsible will be held accountable in accordance with relevant regulations. 6. Strictly implement the safety management system for working on equipment. Anyone who enters containers, towers, furnaces, septic tanks, flues, or other enclosed equipment to carry out work must be inspected by safety personnel; a permit for working inside the container must be obtained before entry, and there must be someone outside the container to supervise and remain on duty. 7. Thoroughly inspect all types of construction equipment to ensure they are in good condition; prevent unsafe tools from entering the construction site. The site should be arranged reasonably to minimize interference and overlap, thereby ensuring both progress and safety. The removed waste materials must be taken away promptly to keep the fire lanes clear. Effective measures should be taken to prevent iron sulfide from catching fire on its own, and the iron sulfide and other materials removed should be buried underground. 8. Strictly implement the blind plate isolation system. Whenever it is necessary to maintain equipment or pipelines, they must be isolated from related systems. The system of installing and removing blind flanges must be strictly followed; blind flanges should be numbered uniformly, and diagrams showing their installation and removal should be prepared. Safety measures must be explained to the personnel performing plug-and-remove blind plate operations to prevent poisoning and burns. It is strictly prohibited to use materials that do not meet the requirements, such as asbestos boards or galvanized sheet metal, in place of blind flanges. The blind plate must have sufficient strength, and its thickness should generally not be less than that of the pipe wall. 9. During maintenance, the power supply to all equipment within the plant area is disconnected; water, electricity, steam, and air must not be turned on or off without the approval of the workshop. For operations such as power supply and shutdown, hot work, earthwork, working at heights, and entry into containers, it is necessary to follow the prescribed procedures and coordinate with the dispatching department to obtain the relevant permits. When using fire-fighting water during maintenance, a permit must be obtained; the water should be used only after approval, in order to avoid disrupting the operation of other equipment. Working without a ticket is prohibited; otherwise, the respective unit and the company carrying out the work will be subject to severe penalties, and those responsible will be held accountable. 10. A high-altitude work permit must be obtained for work at heights; scaffolds and stepping boards must be sturdy and reliable. It is strictly prohibited to work on pipelines or guardrails, and throwing objects from a height is also forbidden. All tools and items must be secure to prevent them from falling and causing injury or damage. 11. Strictly strengthen electricity management during maintenance ； (1) For rotating equipment and maintenance work, the power supply must be cut off and a warning sign placed; if necessary, the fuse should be removed ； (2) Explosion-proof lighting fixtures must be used, and a safe voltage of 36 volts or 12 volts must be employed for lighting inside the equipment ； (3) All types of temporary power cables must not be wrapped together; joints should be securely tied, and they must not come into contact with high-temperature equipment. Where possible, these cables should be installed overhead. Temporary distribution boxes must have rain protection measures and their doors must be locked ； (4) Mobile devices such as hand-held power tools should be equipped with leakage protectors that meet safety requirements to prevent electric shock accidents. 12. Strictly enforce the safety regulations regarding the use of fire; for any fire use during construction, a fire permit must be obtained, and strict approval procedures must be followed. The principle of \"no fire use under any circumstances\" should be adhered to: no fire use without an approved permit, no fire use if fire prevention measures are not in place, and no fire use if the person responsible for monitoring the fire is not present. It is necessary to ensure that the tickets match the actual situation on site; multiple uses of one ticket are strictly prohibited. 13. In special circumstances, when working in toxic or hazardous areas, it is necessary to use appropriate protective equipment such as gas masks and air respirators. 14. It is necessary to strictly control the quality of maintenance work, ensuring intrinsic safety from the source. To lay a solid material foundation for the long-term safe operation of various installations, it is necessary to pay close attention to the quality of equipment, materials, and spare parts, as well as the quality of welding and installation processes, in order to ensure the intrinsic safety of these installations. 15. All external construction teams must sign a Safety Contract with the Safety Production Department to clarify their responsibilities. The safety department has the right to stop any team that fails to operate in accordance with safety regulations; in the event of an accident, such team shall bear the consequences. If repairs are delayed or the company suffers losses due to equipment damage or personal injuries, the construction team and the responsible persons of the relevant units will be held strictly accountable. 16. During maintenance, safety regulations such as the strict prohibition on smoking are maintained without compromise. 17. During maintenance periods, the Safety Production Department and leaders at all levels shall conduct inspections and supervision, and impose penalties on units and individuals that fail to comply with safety regulations and systems or do so inadequately. 18. Designated personnel shall be responsible for organizing the maintenance of key equipment. 19. During maintenance, the DCS and ESD in the control room must not be adjusted or activated arbitrarily to prevent accidents. 20. During maintenance, if a pipeline or equipment needs to be purged with steam, it is necessary to carefully check and confirm that it is safe before introducing steam. 21. When pressing packing, replacing gaskets, changing valves, or installing/removing blind flanges, it is necessary to communicate with the upstream and downstream systems to confirm that there are no issues before proceeding with the work. 22. The inside of the equipment pipes after maintenance must be thoroughly cleaned; they can only be sealed after careful inspection, and inspection records along with the signatures of the maintenance personnel are required. 23. Before driving, conduct a thorough inspection of all safety facilities such as ventilation, communication systems, fire suppression equipment, ladders, platform railings, and lighting, to ensure they are in good condition. 24. Before the installation is put into operation, the procedures and operating methods must be updated in a timely manner in light of any changes in the processes, equipment, instruments, electrical systems, etc. The workers on duty must receive thorough training, and only after passing the examinations may they start working. Appendix: I. Requirements for cleaning the sedimentator of coke 1. Strictly comply with the eight musts for entering containers and equipment. 2. The equipment must be cooled to below 35°C, the procedures for entering the container must be followed, and inspections must be carried out. 3. Before entering the equipment, personal protective equipment must be worn as required, and tools must be used in accordance with safety regulations. 4. When using lifting tools, be careful to ensure safety and prevent slips that could injure people or damage items. 5. The scaffolding should be sturdy, reliable, and convenient to use, with proper fixing points in place. 6. The personnel responsible for cleaning the coke should carry out the task from top to bottom, rotate workers frequently, improve ventilation, and take care to protect themselves. Smoking, dozing off, or resting inside the container is strictly prohibited. Supervisors must remain at their posts and maintain frequent communication. 7. The removed coke lumps should be placed in woven bags and delivered to the ground promptly; it is prohibited to leave them on the guardrails or platforms, as this may block traffic. 8. When the coke block delivery device is in use, prevent damage to fire-fighting and other facilities. 9. If the cleaning of coke is interrupted for more than 30 minutes, it is necessary to arrange for another inspection; work can resume only once approval is given. 10. When cleaning the coke, it is strictly prohibited to carry out operations simultaneously from above and below to prevent coke blocks from falling and causing injury to people or damage to property. 11. All tools should be handled with care to prevent them from falling. 12. In case of any issues, the supervisor should contact the relevant personnel promptly. II. Removal and installation of the tower and the two manholes 1. First, identify the manholes that need to be removed or installed, put on the necessary personal protective equipment, and prepare the tools. 2. All tools should be handled with care, and precautions must be taken to prevent them from slipping from one’s hands and causing injury. 3. The removed screw nuts should be placed neatly in appropriate locations. 4. Standing on the guardrail while working is prohibited; try to leave the work area when resting. III. Loading, unloading, and cleaning of the tower tray 1. When entering the tower, it is necessary to strictly follow the eight requirements and wear appropriate personal protective equipment. 2. The principle for removing trays is to do so from top to bottom, while installing trays should be done from bottom to top; ensure there are safe places to stand to avoid slipping. 3. The cleaned trays should be properly labeled; do not lean on the guardrails to prevent falls that could cause injury. The area should be cleaned promptly, and care should be taken to avoid spontaneous combustion of ferrous sulfide. 4. All tools must meet safety requirements, and supervisors should maintain regular contact with the workers. 5. Throwing objects from heights is strictly prohibited; in special cases, someone must be on the ground to supervise. 6. Workers should ensure good ventilation and avoid working for long periods of time. IV. Maintenance of cooling exchange equipment 1. The maintenance personnel and relevant workshop staff must confirm that the equipment is pressure-free before proceeding with maintenance work. 2. Personal protective equipment must be worn in accordance with safety regulations during work. 3. All tools should be handled with care to prevent them from falling and causing injury; the removed bolts should be placed neatly. 4. All lifting equipment and steel cables must be safe and reliable. It is strictly prohibited to use wire ropes to lift the core; a core extractor must be used instead. 5. The removed ferrous sulfide should be buried promptly to ensure that work is completed, materials are cleared away, and the site is tidy. V. Lining Construction 1. The relevant regulations on the eight mandatory requirements must be strictly followed when entering the container. 2. Apply for a permit to enter the container; entry is permitted only after approval is granted. 3. Before construction, a thorough inspection of the scaffolding must be carried out; it must be sturdy and reliable, and personal protective equipment must be used properly. 4. There must be a supervisor outside to ensure timely communication. 5. All tools and equipment must comply with relevant safety regulations. VI. Maintenance of pumps 1. When entering the maintenance area, it is necessary to wear the required personal protective equipment, such as safety helmets and gloves. 2. The tools used should be handled with care. 3. The removed parts should be placed neatly and not left scattered around. 4. The lifting equipment and steel cables must be safe and reliable. 5. Ensure the work is completed, all materials are removed, and the site is clean. VII. Monitoring personnel in the control room: 1. Remain at their posts and closely monitor changes in the temperatures of various towers, heat exchangers, gasoline pipelines, etc., to prevent spontaneous combustion of ferrous sulfide; report any abnormalities promptly for handling. 2. Strengthen inspections to prevent theft. 3. Have the authority to stop unsafe behaviors.

I’ll be the first to talk about safety issues； During maintenance work: 1. All types of emergency equipment must be checked to ensure they are in good condition and ready for use. 2. For tasks that involve entering confined spaces or performing welding and other hazardous operations, all necessary permits must be in order ； 3. For each type of task, assign supervisors who are responsible and highly skilled. 4. Before carrying out any task, it is necessary to understand the safety risks and the measures to address them. 5. Ensure clear and accurate handover of completed and unfinished tasks between different teams. We are all working in the chemical industry; life is only once, and safety is of utmost importance. Therefore, we must study diligently on a regular basis and operate in a practical manner, as what we learn and the experience we gain might come in handy one day. As for me, I haven’t participated in any maintenance work yet, so I need to go downstairs to get more information

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1. Safety and quality must be prioritized during maintenance work； 2. Work must be carried out in accordance with the pre-approved maintenance plans, maintenance procedures, or maintenance work instructions, so as to ensure that the quality and safety of the maintenance are under control ； 3. The personal protective equipment of the personnel involved in maintenance work must be in order, and the construction machinery must be in good condition ； 4. Safety measures must be in place during maintenance operations, work permits must be complete, and safety isolation measures must be verified ； At the same time, it is necessary to pay attention to changes at the work site, carry out hazard identification and on-site monitoring; in particular, when entering confined spaces or carrying out hot-work operations, the frequency of monitoring must be increased ； 5. Ensure civilized construction and avoid damaging equipment, facilities, and the environment.

Carry out maintenance work strictly in accordance with the maintenance procedures.

1. When entering the site, it is necessary to comply with all the safety production management systems and regulations of the Petrochemical Group Company. 2. Before entering the site, safety training must be conducted; training should cover the hazards present on site, precautions to take, various regulations and rules, as well as knowledge related to fire safety, gas protection, and first aid, and candidates must pass an examination. 3. When entering the site, it is necessary to wear proper personal protective equipment; those who do not wear safety helmets, long-sleeved work clothes, or who wear sandals or high heels are not allowed to enter the site. 4. It is strictly prohibited to enter containers or towers alone for observation, learning, or work. 5. It is strictly prohibited to enter the site while under the influence of alcohol. 6. It is strictly prohibited to enter dangerous areas such as construction sites on frame platforms or under crane booms. 7. It is strictly prohibited to throw objects such as debris and tools from a height. 8. Working at heights is strictly prohibited without wearing a safety belt; working at heights is also strictly prohibited when the wind speed is above level 6. 9. Smoking, carrying flames, or lighting fires is strictly prohibited in the site. 10. It is strictly prohibited to enter special equipment (such as titanium-lined containers, air compressors, generators, steam turbines, clay towers, etc.) casually, or to use inappropriate tools to strike or damage them. 11. Department and station leaders must conduct on-site inspections daily, checking whether employees are complying with various safety regulations and the overall safety conditions at the site, and addressing any issues that are found promptly. And has the authority to stop violations, provide criticism and education, and propose penalties. 12. Instruments, instrument pipelines, valve handwheels, and thin process pipelines must not be stepped on under any circumstances.