Can non-explosion-proof electrical appliances be used after flammable and explosive devices are shut down?
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There is an existing plant building, which is a flammable and explosive area; the plant has currently been shut down for maintenance. Question: Can non-explosion-proof, ordinary household electrical appliances be used inside the device? Around the electrical appliances, the equipment interior has been emptied, but it has not been purged. The facility itself has an open structure without any walls. I hope the answer can provide a theoretical basis; thank you!
If the device originally used flammable and explosive media, even after those materials have been removed, non-explosion-proof electrical equipment cannot be used. If welding work is to be carried out, the device must be cleaned, as well as any potential safety hazards in the vicinity identified.
Studying these \"Provisions on Electrical Safety in Explosive Hazardous Areas of the People’s Republic of China (Trial)\」can be somewhat helpful
I don’t seem to have seen any basis for this theory; here are some personal opinions: 1. Non-explosion-proof electrical equipment cannot be used in explosion-proof areas, and this has nothing to do with production or shutdowns； 2. It has been emptied, but the system has not been purged; and even if it has been purged, flammable and explosive substances may still accumulate, remain, or be absorbed in the system’s equipment and pipelines ； 3. Explosion-proof areas have regulations regarding the use of electrical equipment, with basically no distinction between areas where production is ongoing and those where production has stopped.
Theoretically, it’s definitely not possible, but in practice, it depends on your leaders and on what you do yourselves.
After the device is shut down, no purging or replacement is carried out, and flammable and explosive substances may still accumulate, remain, or even be absorbed in the equipment and pipelines; therefore, non-explosion-proof electrical appliances cannot be used inside the equipment. However, after the device was taken out of service, it was purged and replaced, and once the replacement was confirmed to be satisfactory, I believe that non-explosion-proof electrical equipment can still be used (of course, while the device is in a shut-down state).
One cannot rely on luck; strict safety protocols must be followed.
In my opinion, it cannot be used; first, the equipment is only shut down for maintenance, and flammable substances may still be present inside it. The second device was not purged or replaced. Also, check whether the equipment is disconnected from the pipes.
Theoretically, it’s not feasible; but in practice, such situations are quite common if thorough cleaning and replacement are carried out and the resulting products pass inspection. For example, when repairing equipment and pipelines in flammable and explosive areas, welding machines and similar tools are used
In non-explosion-proof areas, even if the equipment itself is free of contaminants, there may still be flammable and explosive gases present in the surrounding environment. Therefore, non-explosion-proof electrical appliances cannot be used. When work that involves open flames is necessary, it is best to first use a gas concentration detector to measure the gas concentration in the area
In accordance with Article 16, Item (7) of the \"Regulations on Safety Management of Maintenance Operations in Flammable and Explosive Hazardous Areas\" issued by Hu’an Supervision and Administration for Hazardous Chemicals [2008] No. 91, construction workers shall use explosion-proof electrical equipment and tools of the appropriate explosion-proof rating. Article 16 (Safety Measures for Hot Work Maintenance Operations) The following safety measures must be implemented when carrying out hot work maintenance operations: (1) Adhere to the hot work permit system ； (II) The devices, equipment, and facilities, as well as containers (ovens, towers, kettles, tanks, etc.), are disposed of safely, meeting the conditions required for maintenance work ； (III) The area where hot work is to be carried out must be effectively separated from other connected equipment, facilities, metal containers, etc ； (IV) Conduct explosion detection analysis on the equipment, facilities, pipelines, containers in the areas where hot work is carried out, as well as the working environment (an additional explosion detection analysis should be conducted if hot work is suspended for more than half an hour) ； (5) After the equipment and containers used for storing flammable and explosive hazardous chemicals have been properly disposed of, measures such as filling them with water or purging them with nitrogen should be taken for protection ； (6) Before entering the equipment for maintenance work, it is necessary to ensure that the concentrations of flammable gases, harmful gases, and oxygen levels inside the equipment have been tested and found to be within acceptable limits ； (7) Construction workers shall use explosion-proof electrical equipment and tools of the appropriate explosion-proof rating ； ......
Before use, on-site monitoring of combustible gas concentration must be carried out; it can only be used if the levels are within acceptable limits.
Is it a shutdown for major repairs? If so, and if cleaning, replacement, and analysis all yield satisfactory results, then it’s okay; otherwise, it’s not acceptable
If it is for temporary use, following the procedures and practices related to hot work, non-explosion-proof electrical equipment can be used entirely.
Ask those who say it’s not possible: what should be done if welding is necessary on site?
Do you use an open flame during normal production? If not, why use explosion-proof electrical equipment? O(∩_∩)O Haha~
Inspection and maintenance can only be carried out after all contents have been drained and cleaned, using a non-explosion-proof motor.
In areas prone to fire and explosion, the installation has been shut down for maintenance. That’s what it says in the title; I thought it referred to maintenance and repair work. I don’t seem to understand the concept of flammable and explosive areas – are these areas where fires and explosions could occur during normal production, or are they still flammable and explosive even after production has stopped and cleaning is done? Especially during maintenance and repair work, many electrical devices used are not explosion-proof, such as welders, drills, grinders, or gas cutting and welding equipment. . Last edited by eleg on 2009-2-8 12:20]
This area is classified as a flammable and explosive zone because the raw materials used there are flammable and explosive. The owner stated that \"the equipment has been emptied, but it has not been purged,\" which indicates that there are still small amounts or trace quantities of flammable and explosive materials remaining in the equipment’s pipes. Therefore, it is necessary to follow the requirements for explosion-proof areas and use electrical equipment that meets the appropriate explosion-proof standards. It can only be treated as a regular area after thorough cleaning and replacement, as well as the disconnection of all pipelines carrying flammable and explosive materials. The above are merely personal opinions!
A fire permit must be obtained as required; non-explosion-proof motors are considered equivalent to a fire hazard site