For the material toluene, should a combustible gas detector or a toxic gas detector be installed?

We have installed combustible gas detectors, but no toxic gas detectors. For specific reasons, refer to the explanation in these specifications regarding the use of only combustible gas detectors for methanol.

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There is no need to set it as toxic; just setting it as flammable is sufficient. For details, please refer to the article on the official WeChat account of the Automatic Control Design Center. Answers to Frequently Asked Questions Regarding the Implementation of GB/T 50493—2019 1 Issues related to the installation of toxic gas detectors: Question: When installing toxic gas detectors, is it necessary to install them for 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 for the 339 chemical hazardous gases listed in GBZ 2.1—2019 \"Occupational Exposure Limits for Hazardous Factors in Workplaces – Part 1: Chemical Hazardous Factors\"? Response: GBZ/T 223—2009 \"Specifications 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; the design of GDS does not require compliance with these specifications ； 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 their consideration is not necessary in GDS design. 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 gases or vapors specified in the \"Catalogue of Highly Toxic Substances\" issued by the Health and Supervision Department under document No. 〔2003〕142 ； 2) Acutely toxic gases classified as Category 1 and Category 2 for acute toxicity under the standard GB 30000.18—2018, \"Specifications for the classification and labeling of chemicals – Part 18: Acute toxicity\". 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.

GB50493 Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries 3.0.11 Appendix A: Properties of common flammable gases and vapors are provided in Appendix A； Properties of common toxic gases and vapors are listed in Appendix B ； The properties of common flammable dust gases are listed in Appendix C ； The properties of common toxic dust and gases are listed in Appendix D.

Among the safety measures and emergency response principles for the first batch of hazardous chemicals under strict supervision: \"Install fixed combustible gas detectors, or equip portable combustible gas detectors; it is advisable to add toxic gas detectors as well.\" ”Since the recommendation is to install toxic gas detectors, such detectors should indeed be installed to avoid having to make corrections during subsequent inspections by experts.

It is both flammable and toxic; if I remember correctly, toxicity should be given priority. There seems to be a saying that in the past it was necessary to prioritize toxicity, but now it appears that both properties need to be taken into account – someone mentioned this during that inspection. . . They say it’s according to new requirements, but we’ve never seen them, and we don’t dare ask either; it just seems a bit ridiculous