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Maintenance safety matters

Keep in mind

Electrical equipment maintenance safety precautions

1. All electrical maintenance must formulate specific and targeted safety construction measures according to the inspection contents, implement them to each construction personnel, and sign the name. Those who do not sign are not allowed to participate in the maintenance.

2. Where electrical maintenance, maintenance, power failure of the upper level power switch, electrical equipment (including cable) shall not be removed for maintenance, and one person shall not be allowed to perform electrical maintenance work in one place.

3. When it is necessary to engage in electrical maintenance work, the person in charge of construction must submit an application for power failure maintenance, approved by the production dispatching room, and must report to the chief engineer for approval when influencing the power supply to the local fan.

4. The person in charge of construction must be familiar with the scope and location of the impact on the power-off maintenance line, explain it to the construction personnel clearly, and notify the affected unit by the dispatching room. When affecting the operation of the special fan, the unit must be sent to the site to reverse the stage. After the standby fan is started for 10 minutes, the battery will be contacted for maintenance. After the overhaul is completed, the dedicated fan will be turned on for 10 minutes and then left the site.

5. Before the power outage is repaired, the person in charge of the construction shall go to the substation to go through the power outage procedure with the power outage ticket. You must see that the electrician with the substation is indeed powered off, will open the lock, and hang the power outage of “someone is working, no electricity is allowed”. After signing the sign, you can leave the substation before you return the card. There is no substation or distribution point with full-time electrician on duty, and the switch handle after power failure must be locked or tied, indicating the date of power outage, and the person in charge of construction shall designate a person to take care of it.

6. For the power supply of the double circuit and the loop circuit, the maintenance personnel should go to the contact switches of this maintenance part to carry out reliable power failure work.

7. After the power-off part of the substation is shut down, first check with the qualified electro-acupuncture pen that is compatible with the power supply voltage to confirm that the power-off part has no electricity and then conduct relative and phase-to-phase short-circuit discharge. When discharging, first ground and then contact the line conductor. After discharge, leave the line conductor first and then leave the ground. Discharge first to ground and then to phase to phase. For the high pressure part, the operator must wear insulated gloves, wear electrical insulation boots or stand on the insulation table to do the above work.

8. After the maintenance personnel contact the power outage, they must carry out the electricity inspection and discharge work according to the provisions of Article 7. After the discharge, the three-phase short circuit will pull the ground, and then the maintenance work can be carried out.

9. Anyone who has not gone through the power outage procedure must not carry out any work on the stop line.

10. The maintenance personnel are not allowed to change the original wiring arbitrarily to prevent short circuit, reverse and other accidents caused by the wrong phase. If the phase is changed, the maintenance personnel must inform the power unit to pay attention to the motor reversal. When two power supplies are involved, they must work in parallel.

11. The planned maintenance time must be observed. If there is any change, the maintenance person in charge must ask the dispatching room to obtain the consent before proceeding with the maintenance work. Do not trust people to use letters or other contact methods, must be handled by the project leader personally.

12. When the underground electrical maintenance is performed, the gas inspector must check the gas content of the inspection site, and the gas concentration should be less than 1% before the inspection can be carried out.

13. Power supply and maintenance that affects all the winds in the excavation work face must first power off the working power supply, then power off the local fan power supply, and strictly implement the system of power failure.

14. Under the condition that the main fan is planned to stop the wind and the wind is stopped in the accident state, the work of stopping the power transmission in the underground must obey the command of the ventilation dispatch.

15. After the overhaul is completed, the equipment and work site should be carefully inspected, and the short-circuit grounding wire should be removed (who should be removed from the short-circuit grounding wire), and the circuit should be shaken to see if there is a short circuit or grounding phenomenon (for high-voltage lines) High-pressure shaker shake test). Then the construction person in charge fully confirms that there is no fault and then contact the power transmission. When you start to contact the power transmission, no one on the line can do any work.

16. The maintenance personnel must contact the electrician to stop the power supply to the substation. All the power supplies involved in the excavation of the working face must be stopped and sent under the command of the gas inspector at the scene. After the blow-off inspector agrees, the power supply is sent, and the wind power is strictly forbidden.

17. The personnel on duty at the substation received the power-off card and other blackout signs.

18. The power-off card and other blackout signs should be removed after power transmission.

19. The inspection and repair work of underground explosion-proof electrical equipment must meet the technical requirements of explosion-proof performance. Electrical equipment with damaged explosion-proof performance should be disposed of or replaced immediately and must not be used.

20. When repairing a piece of equipment with machinery and electrical, it must be approved by two construction supervisors before starting maintenance. After the completion of the overhaul, two construction instructors must obtain the consent, and all the personnel must leave the rotating part before they can test the vehicle.

Substation maintenance safety precautions

1. Before the operation, it is necessary to check and confirm that the gas concentration in the substation does not exceed 0.5% before power failure. If the gas exceeds the limit, it should immediately report to the dispatching station and hang the “Gas Overrun” warning sign at the entrance of the substation.

2. Stop the switchgear, you must first stop the circuit breaker, then pull the isolation switch. Before operating the main circuit of high-voltage electrical equipment, you must wear insulated gloves, wear insulated boots or stand on the insulation platform.

3. After the power failure, the operating power of the switchgear should be turned off, and the electroscope corresponding to the voltage level should be used. The power should be checked in the order of low voltage and high voltage first. When no voltage is confirmed, the grounding wire is used for discharging.

4. After the power failure, the maintenance electrician must hang the warning sign that “someone works forbidden to close” on the corresponding switchgear.

5. After detailed inspection of the parts of the inspection equipment, after determining the equipment failure point, the damaged parts and related parts should be disassembled in the reverse order of assembly and the disassembly parts should be properly placed in order. When replacing or repairing the damaged parts, repair and assembly should be done according to quality requirements. Before inspection, check and confirm that the tool is not damaged, the appearance is intact, the insulation layer meets the insulation requirements, and the tools matching the model are selected.

6. After the inspection, check the materials, tools and accessories. The quantity must be consistent with the preparation before the work, and clean up the debris in the power distribution cabinet and the maintenance site.

7. After detailed inspection of the equipment being overhauled, carry out detailed inspection to confirm that the fasteners are firm and reliable, the insulation value is within the normal range, the wiring process is correct and reliable, the explosion-proof performance is good, and the grounding protection device is intact.

8. Three times of no-load operation, the power is transmitted three times, each time is not less than 30 seconds. After the air operation is correct, the load can be run. After 30 minutes of normal operation, the maintenance is over.

Electrician ascending work maintenance safety precautions

1. Any work that can be done in advance on the ground must work on the ground to minimize aerial work.

2. Those who work as ascending workers must be in good health. For those who are not suitable for high-altitude operations such as high blood pressure and heart disease, it is strictly forbidden to participate in high-altitude operations. Anyone who finds that the staff has alcohol or lack of energy is prohibited from climbing.

3, ascending operations should be worn according to the provisions of labor protection supplies, when the height exceeds 1.5m, you must use seat belts or take other reliable security measures.

4. The seat belt should be inspected before use and the static load test should be carried out regularly. If the test is unqualified, it is forbidden to use.

5. The hook or rope of the seat belt should be hung on a strong and solid object, or on a steel wire rope for hanging safety belts. It is forbidden to hang on moving or unstable objects.

6. Tools, materials, parts, etc. used for climbing work must be loaded into the tool bag. When you are up and down, you must not put objects in your hands. Do not throw tools, materials and other items. When sliding or rolling tools or materials are stacked on scaffolding, Take measures to prevent falling.

Pipeline maintenance safety precautions

1. The maintenance personnel wear good labor protection supplies.

2. Before the pipeline and valve are inspected, the pressure shall be relieved, cleaned, cooled to below 60 °C, replaced, ventilated, etc., and the pipelines with unknown conditions are strictly forbidden to be repaired.

3, maintenance and repair must be handled in accordance with the provisions of the fire certificate, ascending certificate, land certification, into the tower into the can. The sample in the tube is sampled and analyzed, and then the inspection is carried out.

4. When conveying pipes with inflammable, explosive, toxic and harmful media, it is necessary to install an isolation blind plate after pressure relief, and then replace it, clean it and pass the analysis before it can be repaired. The license plate should be installed and the corresponding safety measures should be taken.

5. When harmful medium may be generated during the maintenance process (adding residual materials to toxic substances, etc.), the following measures shall be taken.

a. Perform gas analysis on a regular basis in accordance with relevant regulations;

b. Ventilation and ventilation in the pipeline without interruption during maintenance;

c. There should be no special supervision during the inspection and the emergency device should be prepared.

6 The power supply voltage of the lamps and tools used in the inspection of large-diameter pipes shall comply with the provisions of GB3805 “Safety Voltage”.

7. Apply a clear mark to the safe area when performing radiographic inspections on site.

8, high-altitude maintenance should avoid the simultaneous construction work up and down, must fasten the seat belt or set up the scaffolding and be supervised by one person.

Storage tank maintenance safety precautions

Corrosion oil storage tanks, chemical, oil, food, fire, transportation, metallurgy, defense and other industries essential, important infrastructure, our economic life is always inseparable from corrosion, large and small tanks, The important role played by anti-corrosion storage tanks in the development of the national economy is irreplaceable. For many enterprises, there is no storage tank and it is impossible to produce normally. In particular, the national strategic material reserves are inseparable from various capacity and types of anti-corrosion storage tanks.

1. Storage tanks for storing flammable gases and flammable liquids shall be equipped with necessary fire-fighting equipment. It is strictly forbidden to smoke in the tanks, open fire, heat, and bring the source of ignition into the tank area.

2. For storage tanks that store flammable, explosive, toxic, corrosive and other media, the relevant provisions on dangerous goods management shall be strictly implemented.

3. Before the tank inspection and repair, the power supply of the electrical equipment related to the storage tank must be cut off, and the equipment handover procedure must be completed.

4. After the internal medium of the storage tank is exhausted, the inlet and outlet valves or the pipes and equipment connected to the blind partition should be closed, and the obvious partition marks should be provided.

5. For storage tanks containing flammable, corrosive, toxic or suffocating media, they must be replaced, neutralized, disinfected, cleaned, etc., and analyzed and tested after treatment. The analysis results should meet the requirements of relevant regulations and standards. . It is strictly forbidden to replace with air with flammable medium.

6. The tank operation must be handled in the tank. If the operation is continued for a long time, the in-tank operation permit should be re-submitted.

7. Sample and analyze before entering the tank for 30 minutes, the oxygen content is between 18-23% (volume ratio).

8. When entering the tank to clean the toxic and corrosive residue, wear personal protective equipment.

9. Scaffolding and lifting devices that need to be built must be firm and reliable. It is strictly forbidden to throw materials and tools inside and outside during operation to ensure safe operation.

10. In-tank lighting should use no more than 24 explosion-proof lamps.

11. When there is a need to fire in the tank, you must apply for a fire certificate.

12. There must be a guardian in the tank operation and reliable contact measures.

13. When the maintenance is completed, the maintenance personnel and the guardian shall jointly inspect the inside and outside of the tank. After confirmation, the guardian can only close each hole after signing the operation certificate in the tank.

14. When releasing water after pressure test, the atmosphere must be connected to prevent vacuum.

Anti-corrosion is the purpose of extending the service life by using various means to protect metal objects that are easily corroded. Usually, physical anti-corrosion, chemistry is adopted.

Mechanical equipment maintenance safety precautions

1. Wear labor protection articles as required during maintenance work.

2. The system of “power off and listing” must be strictly implemented when repairing equipment.

3. The air handling must be carried out before the equipment is repaired.

4. When repairing in the explosion-proof area, pay attention to fireproof and explosion-proof, safe use of explosion-proof tools.

5. When disassembling the equipment, the disassembly force should be uniform to avoid the phenomenon of bruises caused by excessive force.

6, diligent observation during cross-operation, in order to prevent objects from falling and hurting people.

7. When disassembling the equipment, it should be carried out in order, mark and record the relative position of the disassembled parts, and keep them in a safe place.

8, when dismantling the bearing parts quenching the like, should be applied copper rod or stick cushion hammering, not directly beat with a sledgehammer.

9. When repairing the interconnected parts, the connected parts must be jammed so that they cannot be slid before they can be repaired.

10. When installing chain or gear transmission machinery, it is strictly forbidden to rotate the machine arbitrarily;

11. Check whether the reverse chain lock is normal when lifting the equipment, check whether the rack car is normal, to prevent the equipment from slipping and hurting people.

12. If you work at heights of two meters or more, you must issue a working ticket for climbing. You must use the seat belt in the whole process and carefully check it before use. To transfer items up and down in aerial work, use a transfer rope and prohibit throwing. Use ladders to climb at least two, the ladder should be strong and reliable, and pay attention to slip or skew.

13. After the inspection is completed, the tools should be inspected to prevent the tools from remaining in the machine.

14. Before the equipment is tested, it should be moved by hand to check whether the rotation is brisk, whether there is friction or abnormality. After confirming that everything is normal, the vehicle can be tested and delivered. Carefully fill out the inspection records, and withdraw the disassembled equipment parts. The re-use of the storage can be placed neatly, and it is not allowed to stay on the spot.

Safety precautions should be taken when cleaning steam boilers

1. Before the maintenance work, it should be observed whether the environment has working conditions. If the conditions are not met, the value should be notified and reported to the superior leader.

2. Before the maintenance work, notify the operator to cut off the water, electricity, and steam sources and list them by a special person.

3. Tools, various materials and accessories should be placed in the inspection to prevent falling into equipment, pipes or furnaces.

4. When entering the furnace, smoke duct and other space operations, the ventilation conditions should be good, and the temperature can be reduced to the working temperature before entering the work.

5. After the work is finished, check whether the tools, materials and accessories are complete, and prevent them from remaining in the space such as the furnace.

6. After the work is completed, the special person will be delisted and the applicant will be allowed to leave the work site after passing the inspection.

7. Report the inspection results to a long value and make a maintenance record.

Steam boiler maintenance is a concept that directly affects the service life of the equipment. It is a matter worthy of attention for enterprise users. It is necessary to carry out maintenance and repair to ensure the normal operation of the equipment.

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