Methanol: flammable and toxic
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Should methanol be detected as a toxic gas or a flammable gas?； The \"Design Code for Detection of Flammable and Toxic Gases in Petrochemical Enterprises\" states that if a substance is both a flammable gas and a toxic gas, only toxic gas detectors should be installed ； But in its appendix, methanol is classified as a flammable gas. I’m very puzzled by this; I hope everyone can discuss it?
Reply to 1# clock.zsf: This question has already been asked; please search for it first.
Yeah, we discussed it before; the answer is methanol. Go and look it up
Low toxicity, highly sensitive to combustible gas probes, cost-saving
According to the new standards, it should be considered toxic, right?
Classify them as toxic, flammable, or whatever – they’re all the same in essence; it’s the same sensor being used, with just the alarm threshold adjusted. It’s all a mess, so don’t take it too seriously. If you get too serious, your wife will kick you out of bed and complain that you don’t meet the standards..... {:2_36:}
Safety is no trivial matter; the alarm threshold specified there is stricter, so we should follow that one........
Methanol is classified as acute toxicity category 3 and is not considered toxic. Testing for flammability is the right thing to do
Considered in terms of flammability. Issues regarding the installation of toxic gas detectors: When installing toxic gas detectors, is it necessary to treat all 56 types of toxic gases listed in GBZ/T 223—2009 \"Specifications for the Installation of Toxic Gas Detection and Alarm Devices in Workplaces\", as well as the 339 chemical hazardous gases listed in GBZ 2.1—2019 \"Occupational Exposure Limits for Hazardous Factors in Workplaces – Part 1: Chemical Hazardous Factors\", in the same manner as toxic gases? Response: GBZ/T 223—2009 \"Code for the Installation of Toxic Gas Detection and Alarm Devices in Workplaces\" is a standard for occupational health and safety. The types of toxic gases listed are provided as appendices for reference only; GDSS design does not require compliance with these standards ； GBZ 2.1–2019 \"Occupational Exposure Limits for Hazardous Factors in the Workplace – Part 1: Chemical Hazardous Factors\" is also a standard related to occupational health and safety; it deals primarily with the OEL values for toxic gases in the working environment. The types of chemical hazardous gases listed are part of the requirements for occupational health monitoring, and the GDS design is not mandatory in such cases. GB/T 50493—2019 is a safety standard; it lists the common toxic gases used in the petrochemical industry. The sources for these listings are: 1) the 54 types of gases or vapors listed in the “Catalogue of Highly Toxic Substances” issued by the Health and Law Supervision Department under document No. [2003]142 ； 2) According to the standard \"Globally Harmonized System of Classification and Labelling of Chemicals – Part 18: Acute Toxicity\" GB 30000.18–2013, acute toxic gases classified as Category 1 and Category 2 in terms of acute toxicity hazards. The toxic gases listed in GBZ/T 223—2009 and GBZ 2.1—2019 cannot be used as a basis for determining toxic gases according to GB/T 50493—2019, but they can be used as a basis for setting the alarm thresholds for toxic gases. Then one can look up the MSDS for methanol; its acute toxicity is classified as Category 3, so it is not necessary to test for toxicity.