How to determine extremely hazardous media and highly hazardous media in pressure pipelines?
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How to determine extremely hazardous media and highly hazardous media in pressure pipelines? According to which category or normative standard document?
, check for yourself whether these standards are outdated.
The 1985 regulations of the "Classification of Hazard Degrees of Occupational Exposure to Toxics" have been invalidated. To follow the 2010 version of the new regulations, it is necessary to calculate the accurate THI value to determine whether it is an extremely or highly hazardous medium. There is an appendix A on page 30 of the specification "Classification Standard for Toxicity Hazard and Explosion Hazard Degree of Chemical Media in Pressure Vessels" HG/T20660-2017. The 276 chemical dangerous goods contained in Appendix A (Classification and Grading Data Table for Toxicity Hazard Degree of Chemical Media) are accurately judged according to the accurate THI value. If you encounter a medium that does not exist in the table, you can only calculate the THI value yourself based on the various indicators queried.