Is it necessary to install toxic/flammable alarms for trichloromethane?

Trichloroethylene is a toxic and potentially dangerous chemical. In accordance with the general standards and regulations for safe operations, it is recommended to install toxic/flammable alarms in workplaces where trichloromethane is used. Experts' requirements may be based on additional considerations for personnel health and safety. For specific references, one can consult **or the local regulations and standards related to occupational health and safety. .

According to GBT50493 and GBZT223, it is not necessary to install detectors for flammable or toxic gases; if experts suggest otherwise, they should provide the relevant evidence. Furthermore, when a project undergoes occupational health design, third-party design firms will provide designs that comply with relevant regulations; it is advisable to check how the design report on protective measures against occupational diseases describes these aspects.

I encountered this problem before as well. As stated in https://bbs.hcbbs.com/thread-3588316-1-1.html, in the \"Notice by the State Administration of Work Safety on Publishing the List of Hazardous Chemicals Subject to Priority Supervision – Anwen Zongguan San [2011] No. 95\", it is specified that trichloromethane【active reaction】produces highly toxic phosgene, hydrogen chloride, and carbon monoxide when it comes into contact with open flames or hot objects. 【General Requirements】 Operators must receive specialized training, strictly adhere to operating procedures, master operational skills proficiently, and possess knowledge of emergency response. In facilities that produce trichloromethane or use it extensively as a raw material, the processes of reaction, washing, cooling, drying, and condensation must be carried out in sealed conditions; enclosed work areas should be thoroughly ventilated ； Prevent trichloromethane and its vapors from leaking into the workplace air ； In areas where trichloromethane is present or used, install trichloromethane detection alarms and interconnect them with emergency ventilation systems…

I don’t think it’s necessary. Answers to Consultation Questions (21) Shangyu District Hazardous Chemicals Safety Technology Association 2022-05-30 18:51 Published in Zhejiang Tian Tian Xue An Quan 2022-08-28 20:55 Published in Shandong Consultation Question 9: Currently, the design of toxic and flammable gases in the chemical industry is generally carried out in accordance with GB 50493-2019, the Design Standard for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries. For hazardous chemicals that are not listed in the appendices of this standard, is it necessary to install detectors for toxic and flammable gases? If chloroform is not listed in the appendix, it can be gradually oxidized by air when exposed to light to form the highly toxic phosgene. Answer: Enterprises should install detectors for toxic and flammable gases in accordance with the requirements of GB 50493-2019, the Design Standard for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries. The chemicals listed in the appendix of this standard are common flammable and toxic hazardous substances; for hazardous substances that are not listed, enterprises should determine whether to install gas detectors based on their flammability and toxicity levels. According to the safety data sheet for trichloromethane, it can produce highly toxic phosgene when in contact with an open flame; however, phosgene is less likely to be generated in the presence of light. Therefore, companies can decide whether it is necessary to install trichloromethane alarms based on their specific circumstances.

Don’t talk back to experts. :lol