If you don’t understand these eight major risks associated with high-risk operations, never sign the work order – or risk ending up in prison
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1. Hot work – Sequence, Risk Analysis, Safety Measures: 1. Flammable, explosive, and hazardous substances: ① Clean and replace the materials inside the equipment and pipelines involved in hot work, and ensure that they meet the required standards after analysis. ②When hot work is performed on a storage tank, flammable materials must be removed, and the tank should be filled with clean water or an inert gas for protection. ③Internal device protection (nitrogen, water vapor). ④When hot work is performed inside the tower, soak asbestos cloth in water and lay it on the two adjacent trays for isolation. ⑤When performing welding work in a confined space, it is necessary to obtain a \"Confined Space Work Permit.\" If sparks from the welding process spread to other equipment, or if flammable materials come into contact with the welding equipment, the pipes connected to that equipment must be disconnected and sealed off using blind plates – a total of ____ blind plates should be used for this purpose. A sign should be placed there, and a \"Blind Plate Installation/Removal Work Permit\" must also be obtained. 3. There are flammable materials around the area where welding will take place. ① Remove the flammable materials from around the welding site; also clear any flammable substances from septic tanks, floor drains, ditches, cable trenches, etc., located in the vicinity, and seal them up afterward. ②When working with fire in cable trenches, remove any flammable gases and liquids from the trench; if necessary, isolate both ends of the trench. 4 Leakage current (induced electricity) hazards: The welding return circuit should be connected to the welded piece, not to other equipment, and it is prohibited to pass through sewers (wells). 5. Spark dispersion on Mars ① For hot work at heights, obtain a “High-Work Permit” and take measures to prevent sparks from dispersing. ②Pay attention to the direction in which the sparks fly, and rinse the area where they land with water. 6 Insufficient spacing or improper placement of gas cylinders: ① The spacing between oxygen cylinders and acetylene cylinders dissolved in liquid form should be no less than 5 meters, and the distance between each of these cylinders and the area where welding or cutting takes place should be no less than 10 meters. ②Gas cylinders must not be exposed to direct sunlight, and acetylene cylinders must not be placed in a horizontal position. 7 Before carrying out welding or cutting operations with faulty tools, these tools should be inspected to ensure they are safe and reliable; it is not allowed to use them in a defective state. 8 During the operation, in case of leakage of flammable materials or the presence of flammable gases during welding work, welding must be stopped immediately if there is material spillage or cross-contamination. 9 Poor ventilation: When performing welding or similar tasks indoors, the doors and windows should be opened; surrounding equipment should be covered, sink traps should be sealed, oil stains should be removed, and no cleaning operations using flammable substances such as solvents should take place in the vicinity. ②Local forced ventilation is used ； 10. For unscheduled monitoring: ① The interval between sampling and hot work must not exceed 30 minutes; if this interval is exceeded or if the hot work is interrupted for more than 30 minutes, sampling and analysis must be carried out again. ②The sampling points should be representative, and the analysis samples from special hot work operations should be retained until such work is completed. ③During the welding process, and when work is interrupted, no remaining embers should be left at the site. Before resuming welding, it is necessary to carefully check whether there have been any changes in the conditions at the site; if there have been changes, welding must not proceed. 11 Improper supervision: ① The person in charge of monitoring should be familiar with the site environment and ensure that safety measures are properly implemented; they should possess relevant safety knowledge and emergency response skills, remain in contact with their post, stay aware of any changes in operating conditions, and stay at the site at all times. ②The fire watcher extinguishes any spilling sparks at all times; if anything abnormal is detected, they immediately inform the person performing the work to stop and contact the relevant personnel to take action. 12 Insufficient emergency facilities or inadequate measures: ① Fire-fighting equipment must be available at the site where welding work is carried out (such as steam pipes, water pipes, fire extinguishers, sand, iron shovels, etc.). ②Put the fixed foam fire extinguishing system in a pre-startup state. 13 In cases involving combinations of hazardous operations for which appropriate safety measures have not been implemented, when carrying out hazardous tasks such as working inside reactors, at heights, removing or installing blind flanges, or maintaining pipeline equipment, the relevant operation permits must also be obtained. 14 Significant changes in construction conditions: In the event of any significant changes in construction conditions, a new “*-Level Hot Work Permit” must be obtained. 2. Entering confined spaces for work – Sequence, Risk Analysis, Safety Measures: 1. Unreliable isolation: ① Use blind flanges to isolate the material, steam, and nitrogen pipelines connected to the equipment, and obtain a ‘Blind Flange Installation/Removal Permit’. ②Remove the relevant pipelines. To prevent mechanical injuries, proceed with the procedures to shut down the equipment, cut off its power supply, install a \"Do Not Close\" warning sign, and assign a dedicated person to monitor the situation. 3 After the improper permutation is completed, sampling and analysis are carried out until it meets the requirements. 4 In areas with insufficient oxygen, the oxygen content is 18–21%. 5 Poor ventilation ① Open the device’s ventilation holes for natural ventilation. ②Forced ventilation is used. ③Wear an air respirator or long-tube mask. ④Air is supplied through ducts; prior to ventilation, it is necessary to analyze and confirm the contents within the ducts as well as the air source. The introduction of oxygen for oxygenation is strictly prohibited. ⑤The temperature inside the equipment must be suitable for personnel to work in. 6. Unscheduled monitoring: ① Within 30 minutes before starting work, it is necessary to take samples of the gases inside the equipment and analyze them; only if they meet the specified standards can one enter the equipment. ②The sampling points should be representative. ③During the operation, regular monitoring should be strengthened, and the operation must be stopped immediately if any abnormalities are detected. 7 Hazards of electric shock: ① The lighting voltage inside equipment should be less than or equal to 36V; in humid or confined spaces, it should be less than or equal to 12V. ②When using hand-held power tools with a voltage higher than the safe level, leakage protectors must be installed as required. 8 Improper protective measures ① In environments with oxygen deficiency or toxicity, wear a isolated-type gas mask ； ②In flammable and explosive environments, use explosion-proof low-voltage lighting fixtures and spark-free tools; it is prohibited to wear fiber-based fabrics ； ③In corrosive environments such as those with acids and bases, wear appropriate corrosion-resistant protective gear, including slag removal suits, acid-resistant boots, acid-resistant gloves, and safety goggles. The 9-channel passages must be unobstructed; there should be no obstacles that prevent people from entering or exiting the equipment. 10 Improper supervision: ① Before entering the equipment, the supervisor should check the safety measures together with the workers and establish a unified communication signal ； ②The supervisor must remain in contact with the equipment at all times and must not leave their post ； ③The supervisor secures the worker with a safety rope to carry out the work. 11 Insufficient emergency facilities or improper measures ① Outside the equipment, there should be corresponding first-aid supplies such as air respirators, fire-fighting equipment, and clean water ； ②When carrying out rescue operations inside equipment in case of an accident, rescuers must take proper protective measures before entering the equipment to carry out the rescue. 12. In cases involving combinations of hazardous operations, corresponding safety measures must be implemented. When carrying out hazardous operations such as hot work, working at heights, or blind flange removal/installation, relevant work permits must also be obtained. 13 Significant changes in construction conditions: If there are significant changes in the construction conditions, it is necessary to obtain a new ‘Confined Space Work Permit’. 14 Foreign objects remaining inside the equipment: After work is completed inside the equipment, it is essential to thoroughly inspect both the inside and outside of the equipment to ensure that no tools or other items are left behind. 3. Temporary electrical work Sequence Number Risk Analysis Safety Measures 1 Illegal operations ① Workers must hold a certificate for safe electrical work. ②The overhead height of temporary power lines should be no less than 2.5 meters inside the facility, and no less than 5 meters on roads. ③For all temporary electrical wiring, bare wires shall not be used. ④Temporary overhead power lines must not be installed on trees or scaffolding. 2 For damaged cables buried in ducts, underground cable lines should be equipped with direction markers and safety signs, and the burial depth of the cables should be greater than 0.7 meters. 3. Temporary power distribution panels and boxes at the site of short circuits in distribution panels and boxes should have rain protection measures. 4 Preventing facility damage ① Temporary electrical installations should be equipped with leakage protectors. ②Electrical equipment, circuit capacity, and load must meet the required standards. 5 Temporary electrical equipment and circuits used to prevent fires and explosions must meet the corresponding explosion-proof requirements. 6 Significant changes in working conditions: If there are significant changes in the working conditions, a new ‘Temporary Electricity Use Permit’ must be obtained. 4. Working at heightsNo. Risk analysis Safety measures
1 Operators are unfamiliar with the working environment or lack relevant safety skills. Operators must receive safety training, become familiar with the site environment and construction safety requirements. Only after checking and confirming that all safety measures have been properly implemented in accordance with the contents of the “Permit for Working at Heights” may they commence work. 2. Workers fail to wear fall prevention and anti-slip equipment, use it improperly, or the equipment does not meet relevant safety standards. Workers must wear safety helmets, fasten safety belts, and wear anti-slip shoes. Before use, it must be checked to ensure compliance with relevant safety standards; during use, it should be utilized correctly. 3. In the absence of a designated supervisor or when the supervisor fails to fulfill their duties, the person in charge of operations must be familiar with the site environment and ensure that safety measures are properly implemented. They should possess the necessary safety knowledge and emergency response skills, remain in contact with their post, keep track of any changes in operating conditions, and stay at the site at all times. 4. The scaffolding platforms are not fixed, and the scaffolding and protective fences do not meet the relevant safety requirements; such scaffolding and protective fences must comply with the applicable safety regulations. 5 When working with lightweight materials such as asbestos shingles and shingle purlins, a fixed load-bearing platform should be set up and one should work on that platform. 6. During working at heights, there is a risk of personnel falling, or tools, materials, and parts falling from heights and causing injuries. Tools, materials, and parts used in work at heights must be placed in tool bags; no items should be held in hands when ascending or descending. It is prohibited to throw or catch tools, materials, and other items in the air. When tools and materials that are prone to sliding or rolling are placed on scaffolds, measures should be taken to prevent them from falling. 7. Improper positioning beneath areas where work is being performed at heights or failure to implement reliable isolation measures: No one is allowed to stand directly beneath areas where work is being carried out at heights. When such work is conducted concurrently with other operations, personnel must ascend and descend via designated routes; vertical movement during such operations is strictly prohibited. When work must be performed vertically, reliable isolation measures should be taken. The distance between Item 8 and electrical equipment (wiring) does not meet safety requirements, or no effective insulation measures have been taken. Working at heights near electrical equipment (wiring) must comply with the required safety distances. When performing work at heights on live electrical installations using the ground (zero) potential or equal potential method, insulated tools must be used. 9 The illumination at the work site is poor. Sufficient lighting is required for work at heights. 10. For work at heights of more than 30 meters where there are no communication or liaison tools, or where communication is difficult, such tools must be provided; a designated person shall be responsible for maintaining contact, and information related to communication shall be recorded in the supplementary section for safety precautions on the High-Height Work Permit. 11 Workers suffering from occupational contraindications such as hypertension, heart disease, or acrophobia, or those in poor health, including individuals with occupational contraindications, the elderly and frail, those experiencing excessive fatigue, those with poor eyesight, those under the influence of alcohol, and anyone else in poor health, are not permitted to perform work at heights. 12. Working at heights under adverse weather conditions such as strong winds and heavy rain: Work at heights must be halted when encountering adverse weather conditions like heavy rain, dense fog, or winds exceeding force 6. 13 Activities involving hazardous tasks such as hot work and the removal or installation of blind flanges require corresponding safety measures to be put in place; when such hazardous tasks are carried out, relevant work permits must also be obtained. 14. Significant changes in working conditions: In case of any significant changes in working conditions, a new “High-Place Work Permit” must be obtained.
5. Road closure operations
No. Risk analysis Safety measures
1 Unclear signage and poor communication of information may affect traffic flow and lead to accidents.
① Before commencing work, the construction unit shall set up traffic barriers and road closure signs at the closure site to inform incoming and outgoing vehicles of the detour routes.
② After approving the “Road Closure Permit”, the traffic management authorities shall promptly notify relevant departments such as the dispatch office. 2. During construction, the absence of appropriate safety measures or their inadequate implementation can lead to traffic accidents or injuries. ① During road closure work, the construction party is responsible for setting up fences and traffic warning signs at the construction site; red warning lights should be installed at night. ② When carrying out road closure work, the construction party should assign safety inspectors to ensure that the road remains open at all times in case of emergencies. ③During circuit interruption construction, the construction unit shall not randomly pile up construction materials. 3. After the work is completed, if the site is not thoroughly cleaned, it can impede traffic and lead to accidents. ① After circuit interruption work is finished, the construction party shall be responsible for cleaning up the site, removing the barriers, circuit interruption signs, fences, warning signs, and red warning lights placed there, and reporting this to the traffic management authorities. ②After conducting an on-site inspection, the traffic management authorities notify the relevant units that the road closure work is complete and that traffic can be resumed. Unapproved changes can lead to accidents. Road closure operations must be carried out in accordance with the requirements specified in the \"Road Closure Permit\"; it is strictly prohibited to alter or lend this permit, as well as to change the scope of the work, expand it, or move the location of the work without authorization. ②If the disconnection work is not completed within the time specified in the Disconnection Work Permit, the entity that requested the disconnection must proceed with the procedures again. 5. Involvement of combinations of hazardous operations without implementing corresponding safety measures: When carrying out hazardous operations such as working at heights or excavation, relevant work permits must be obtained simultaneously. 6 Significant changes in construction conditions: If there are significant changes in the construction conditions, a new ‘Circuit Disconnection Permit’ must be obtained. 6. Groundwork operations Sequence Number Risk Analysis Safety Measures 1 Damage to pipelines and cables, leading to accidents① Electric cables have been identified, and protective measures have been implemented. ②The telecommunications cable has been confirmed, and protective measures have been implemented. ③The underground water supply and drainage pipelines as well as the process pipelines have been identified, and protective measures have been implemented. ④When digging approaches underground concealed facilities, it should be done gently; the use of mechanical tools such as grabbers is prohibited. ⑤Construction has been carried out in accordance with the construction plan drawings; ⑥ The road construction work has been reported ； Transportation, fire protection, dispatching, and safety supervision departments: In the event of a collapse, ① when multiple people are digging simultaneously, they should maintain a certain safety distance between themselves. ②Excavation should be carried out from top to bottom; the method of digging from the bottom up is prohibited. The excavated soil must not be used to block drains and manholes. ③Support must be provided when digging ditches, pits, etc. without slopes. Before excavation, surface water should be removed, and drainage measures must be taken once digging reaches below the groundwater level. ④Sloping and wall stabilization support have been carried out. ⑤Operators must wear safety helmets. It is prohibited for people to stand or walk on the upper edges of pits, grooves, wells, and ditches. 3 In case of poisoning: ① Have combustible gas detectors and toxic substance detectors on hand. ②Workers must wear protective equipment. ③Protection measures for personnel entry, exit, and evacuation have been implemented: Ladder A, B, and slope repair. 4 Causes of falls: ① Fencing, warning lines, signboards, and night-time warning lights at the work site have been installed as required. ②Sufficient lighting is available at the work site at night: A ordinary lights, B explosion-proof lights. ③A stepping board should be laid when workers go up and down. 5 In cases involving combinations of hazardous operations for which appropriate safety measures have not been implemented, relevant operation permits must also be obtained when working at heights or performing tasks that involve breaking connections and other hazardous activities. 6 Significant changes in construction conditions: If there are significant changes in the construction conditions, a new ‘Excavation Permit’ must be obtained. 7. Lifting operations Sequence Number Risk Analysis Safety Measures 1 Operation without proper certification: Lifters and supervisors must receive professional training and work only with the necessary certifications. 2 Confused command: In situations that are not urgent or emergency, there should be a designated person in charge at the site to give clear instructions. 3. There are no warning lines or signs; a comprehensive lifting plan should be in place, warning lines should be established, safety signs should be put up, and access should be prohibited for persons other than those involved in the construction work. 4 Poor working conditions ① Sufficient lighting must be available at the work site at night. ②Operations must be halted in case of severe weather conditions such as heavy rain, dense fog, or winds of force 6 or higher. 5 Failure to strictly adhere to the “10 rules against lifting” for lifting operations: ① Do not lift if the command signals are unclear or confusing ； ②Do not lift if overloaded or if the weight of the object is unknown ； ③Do not lift heavy objects by pulling them at an angle ； ④There is not enough light; it’s impossible to see clearly, so heavy objects should not be lifted ； ⑤Do not lift people under heavy objects ； ⑥Heavy objects buried underground are not lifted ； ⑦The heavy object is not securely fastened; the rope is knotted, and it should not be lifted if the rope is not in good condition ； ⑧Sharp-edged objects must not be lifted without protective padding ； ⑨Do not lift if safety devices are malfunctioning ； ⑩Do not lift weights that are higher than a person’s head. 6 Involves combinations of hazardous operations for which appropriate safety measures have not been implemented. ① If road traffic needs to be blocked during lifting operations, a \"Road Closure Permit\" must be obtained. ②At the lifting site, when workers perform tasks at heights of more than 2 meters, they must obtain a \"High-Height Work Permit\". ③For other hazardous operations, the relevant operation permits must be obtained. 8. Blind plate removal and installation – Sequence Number, Risk Analysis, Safety Measures: 1. Defective blind plates: The material used for the blind plate must be suitable; its thickness should be determined through strength calculations. High-pressure blind plates must pass flaw detection tests. The blind plate should have one or two handles to facilitate identification and removal/installation, and matching gaskets should be used. 2 Hazardous and harmful substances (energy): It is important to note that ① before removing or installing blind flanges, the pressure in the pipeline should be reduced to atmospheric pressure or slightly positive pressure ； ②It is strictly prohibited to carry out two or more blind plate removal and installation operations on the same pipeline at the same time ； ③The gas temperature should be less than 60℃ ； ④Workers are strictly prohibited from standing directly in the direction from which hazardous substances (energies) may emerge; they must use appropriate personal protective equipment. 3 When working with an open flame or other sources of fire in areas prone to fire and explosion, no welding or similar operations shall be carried out within 30 meters of the work site ； Explosion-proof lighting fixtures are used for work lighting ； Use explosion-proof tools; it is prohibited to strike pipelines, flanges, etc. with iron tools. 4. Operational errors: ① When removing or installing multiple blind flanges, the person in charge of the operation should give unified instructions based on the blind flange location diagram and their corresponding numbers ； ②A sign should be placed at each plug and blind flange to indicate its location. 5 Poor ventilation ① Open doors and windows to enhance natural ventilation ； ②Local forced ventilation is used. 6 Improper supervision: ① There should be a dedicated person to supervise the work, and this supervisor must not leave the work site until the work is completed ； ②The supervisor should be familiar with the site environment and verify that safety measures have been properly implemented; they must possess relevant safety knowledge and emergency response skills, remain in contact with the crew, and stay informed of any changes in operating conditions at all times. 7 In locations where emergency response is insufficient and operations are complex and highly dangerous, in addition to the supervisor, personnel from other relevant departments should also be present at the site to prepare for emergencies. 8 In cases involving combinations of hazardous tasks for which appropriate safety measures have not been implemented, when working in hazardous conditions such as those involving open flames, confined spaces, or working at heights, the relevant work permits must also be obtained. 9 Significant changes in operating conditions: If there are significant changes in the operating conditions, a new ‘Blind Flange Opening and Closing Work Permit’ must be obtained.
No. Risk analysis Safety measures
1 Unclear signage and poor communication of information may affect traffic flow and lead to accidents.
① Before commencing work, the construction unit shall set up traffic barriers and road closure signs at the closure site to inform incoming and outgoing vehicles of the detour routes.
② After approving the “Road Closure Permit”, the traffic management authorities shall promptly notify relevant departments such as the dispatch office. 2. During construction, the absence of appropriate safety measures or their inadequate implementation can lead to traffic accidents or injuries. ① During road closure work, the construction party is responsible for setting up fences and traffic warning signs at the construction site; red warning lights should be installed at night. ② When carrying out road closure work, the construction party should assign safety inspectors to ensure that the road remains open at all times in case of emergencies. ③During circuit interruption construction, the construction unit shall not randomly pile up construction materials. 3. After the work is completed, if the site is not thoroughly cleaned, it can impede traffic and lead to accidents. ① After circuit interruption work is finished, the construction party shall be responsible for cleaning up the site, removing the barriers, circuit interruption signs, fences, warning signs, and red warning lights placed there, and reporting this to the traffic management authorities. ②After conducting an on-site inspection, the traffic management authorities notify the relevant units that the road closure work is complete and that traffic can be resumed. Unapproved changes can lead to accidents. Road closure operations must be carried out in accordance with the requirements specified in the \"Road Closure Permit\"; it is strictly prohibited to alter or lend this permit, as well as to change the scope of the work, expand it, or move the location of the work without authorization. ②If the disconnection work is not completed within the time specified in the Disconnection Work Permit, the entity that requested the disconnection must proceed with the procedures again. 5. Involvement of combinations of hazardous operations without implementing corresponding safety measures: When carrying out hazardous operations such as working at heights or excavation, relevant work permits must be obtained simultaneously. 6 Significant changes in construction conditions: If there are significant changes in the construction conditions, a new ‘Circuit Disconnection Permit’ must be obtained. 6. Groundwork operations Sequence Number Risk Analysis Safety Measures 1 Damage to pipelines and cables, leading to accidents① Electric cables have been identified, and protective measures have been implemented. ②The telecommunications cable has been confirmed, and protective measures have been implemented. ③The underground water supply and drainage pipelines as well as the process pipelines have been identified, and protective measures have been implemented. ④When digging approaches underground concealed facilities, it should be done gently; the use of mechanical tools such as grabbers is prohibited. ⑤Construction has been carried out in accordance with the construction plan drawings; ⑥ The road construction work has been reported ； Transportation, fire protection, dispatching, and safety supervision departments: In the event of a collapse, ① when multiple people are digging simultaneously, they should maintain a certain safety distance between themselves. ②Excavation should be carried out from top to bottom; the method of digging from the bottom up is prohibited. The excavated soil must not be used to block drains and manholes. ③Support must be provided when digging ditches, pits, etc. without slopes. Before excavation, surface water should be removed, and drainage measures must be taken once digging reaches below the groundwater level. ④Sloping and wall stabilization support have been carried out. ⑤Operators must wear safety helmets. It is prohibited for people to stand or walk on the upper edges of pits, grooves, wells, and ditches. 3 In case of poisoning: ① Have combustible gas detectors and toxic substance detectors on hand. ②Workers must wear protective equipment. ③Protection measures for personnel entry, exit, and evacuation have been implemented: Ladder A, B, and slope repair. 4 Causes of falls: ① Fencing, warning lines, signboards, and night-time warning lights at the work site have been installed as required. ②Sufficient lighting is available at the work site at night: A ordinary lights, B explosion-proof lights. ③A stepping board should be laid when workers go up and down. 5 In cases involving combinations of hazardous operations for which appropriate safety measures have not been implemented, relevant operation permits must also be obtained when working at heights or performing tasks that involve breaking connections and other hazardous activities. 6 Significant changes in construction conditions: If there are significant changes in the construction conditions, a new ‘Excavation Permit’ must be obtained. 7. Lifting operations Sequence Number Risk Analysis Safety Measures 1 Operation without proper certification: Lifters and supervisors must receive professional training and work only with the necessary certifications. 2 Confused command: In situations that are not urgent or emergency, there should be a designated person in charge at the site to give clear instructions. 3. There are no warning lines or signs; a comprehensive lifting plan should be in place, warning lines should be established, safety signs should be put up, and access should be prohibited for persons other than those involved in the construction work. 4 Poor working conditions ① Sufficient lighting must be available at the work site at night. ②Operations must be halted in case of severe weather conditions such as heavy rain, dense fog, or winds of force 6 or higher. 5 Failure to strictly adhere to the “10 rules against lifting” for lifting operations: ① Do not lift if the command signals are unclear or confusing ； ②Do not lift if overloaded or if the weight of the object is unknown ； ③Do not lift heavy objects by pulling them at an angle ； ④There is not enough light; it’s impossible to see clearly, so heavy objects should not be lifted ； ⑤Do not lift people under heavy objects ； ⑥Heavy objects buried underground are not lifted ； ⑦The heavy object is not securely fastened; the rope is knotted, and it should not be lifted if the rope is not in good condition ； ⑧Sharp-edged objects must not be lifted without protective padding ； ⑨Do not lift if safety devices are malfunctioning ； ⑩Do not lift weights that are higher than a person’s head. 6 Involves combinations of hazardous operations for which appropriate safety measures have not been implemented. ① If road traffic needs to be blocked during lifting operations, a \"Road Closure Permit\" must be obtained. ②At the lifting site, when workers perform tasks at heights of more than 2 meters, they must obtain a \"High-Height Work Permit\". ③For other hazardous operations, the relevant operation permits must be obtained. 8. Blind plate removal and installation – Sequence Number, Risk Analysis, Safety Measures: 1. Defective blind plates: The material used for the blind plate must be suitable; its thickness should be determined through strength calculations. High-pressure blind plates must pass flaw detection tests. The blind plate should have one or two handles to facilitate identification and removal/installation, and matching gaskets should be used. 2 Hazardous and harmful substances (energy): It is important to note that ① before removing or installing blind flanges, the pressure in the pipeline should be reduced to atmospheric pressure or slightly positive pressure ； ②It is strictly prohibited to carry out two or more blind plate removal and installation operations on the same pipeline at the same time ； ③The gas temperature should be less than 60℃ ； ④Workers are strictly prohibited from standing directly in the direction from which hazardous substances (energies) may emerge; they must use appropriate personal protective equipment. 3 When working with an open flame or other sources of fire in areas prone to fire and explosion, no welding or similar operations shall be carried out within 30 meters of the work site ； Explosion-proof lighting fixtures are used for work lighting ； Use explosion-proof tools; it is prohibited to strike pipelines, flanges, etc. with iron tools. 4. Operational errors: ① When removing or installing multiple blind flanges, the person in charge of the operation should give unified instructions based on the blind flange location diagram and their corresponding numbers ； ②A sign should be placed at each plug and blind flange to indicate its location. 5 Poor ventilation ① Open doors and windows to enhance natural ventilation ； ②Local forced ventilation is used. 6 Improper supervision: ① There should be a dedicated person to supervise the work, and this supervisor must not leave the work site until the work is completed ； ②The supervisor should be familiar with the site environment and verify that safety measures have been properly implemented; they must possess relevant safety knowledge and emergency response skills, remain in contact with the crew, and stay informed of any changes in operating conditions at all times. 7 In locations where emergency response is insufficient and operations are complex and highly dangerous, in addition to the supervisor, personnel from other relevant departments should also be present at the site to prepare for emergencies. 8 In cases involving combinations of hazardous tasks for which appropriate safety measures have not been implemented, when working in hazardous conditions such as those involving open flames, confined spaces, or working at heights, the relevant work permits must also be obtained. 9 Significant changes in operating conditions: If there are significant changes in the operating conditions, a new ‘Blind Flange Opening and Closing Work Permit’ must be obtained.
It’s in place; the leadership has worked hard. Thank you for sharing the resources.
Very good, thank you for sharing, extra points.....
Thank you for sharing. Indeed, in reality, many supervisors issue work orders without even going to the site and simply sign them. I hope everyone understands that we must be responsible for the signatures we put on.