GB18218 Identification of Major Hazard Sources for Hazardous Chemicals
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Table 2 of GB18218-2018 \"Identification of Major Hazard Sources for Hazardous Chemicals\": W5.2—Categories 2 and 3. Special process conditions that may lead to major accidents include hazardous chemical processes, operations within or near the explosion limit range, and operating pressures greater than 1.6 MPa. Question: What are hazardous chemical processes? (Is it a high-risk chemical process that requires strict supervision?) ) 2. What is the explosion limit range? (Does it refer to the explosive limit range of a substance?) Are all substances with an explosive range considered special process conditions that can lead to major accidents? Are there specific standards? ) 3. Nearby operations? (Is drainage work near a storage tank considered to be work in the vicinity?) ) 4. For example: How is the critical amount for xylene determined? Is it 50 tons or 5,000 tons? Thank you!
Regarding the critical quantity, you can check the regulations regarding the critical quantity for hazardous chemicals; it is specifically defined and remains unchanged
Hazardous chemical processes refer to those in the chemical production process that can cause accidents such as fires, poisoning, and explosions. Processes that are under strict supervision fall under the category of hazardous chemical processes; however, there are also other such processes as well
Table 2 W5.2 lists the criteria for identifying major hazard sources, which are the specific process conditions that can lead to major accidents. Not all hazardous chemical processes must qualify as such, right? All of those explosion limit ranges are also not the ones that could lead to major accidents, right? I would like to define which are the hazardous chemical processes and explosive limit ranges that cause major accidents. Therefore, when determining xylene, it is unclear how to determine the critical amount for a major hazard source.