Is it necessary to install a combustible gas alarm for trichloromethane?
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According to the \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries\" GB/T50493-2019 and its relevant interpretations, trichloromethane does not fall under 1. the list of highly toxic chemicals in the 2015 version, nor under those chemicals with acute toxicity classified as Category 1 or Category 2 in the \"Classification Information Table of Hazardous Chemicals (2015)\“. It is basically consistent with the requirements specified in GB 30000.18-2013, Specifications for the classification and labeling of chemicals – Part 18: Acute toxicity. 3. Gases or vapors listed in the “Catalogue of Highly Toxic Substances” (Wei Fa Jian Fa [2003] No. 142). Therefore, there is no need to install toxic gas detection alarms. However, the \"Notice of the General Administration of Work Safety on Publishing the List of Hazardous Chemicals Subject to Priority Supervision, No. An Jian Zong Guan San [2011] 95\" stipulates that trichloromethane【active reaction】produces highly toxic phosgene, hydrogen chloride, and carbon monoxide when in 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 well-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 ； When using trichloromethane in small quantities, the operation should be carried out in a fume hood ； Contact with high temperatures and open flames is prohibited. Equipped with two or more sets of heavy protective clothing. Provide safety showers and eye wash stations. What are the similarities and differences between the “trichloromethane detection alarm” here and the “toxic gas detection alarm” mentioned above? How should one decide between the \"Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries\" GB/T50493-2019 and the \"Notice of the State Administration of Work Safety on Publishing the List of Hazardous Chemicals Subject to Priority Supervision, An Jian Zong Guan San [2011] No. 95\"?
I’ve done it; it’s based on toxic gases
Are you majoring in process engineering or instrumentation?
A toxic gas detector should be used; trichloromethane is non-flammable.
I recently contacted the client’s safety director, and he said to be strict and implement toxic substance alarms.
Trichloromethane is not flammable, but it is highly toxic; a toxic gas alarm is sufficient for monitoring it. Additionally, when trichloromethane burns, toxic gases such as chlorine, hydrogen chloride, and phosgene may be produced, so fire prevention is necessary when storing it.
This post was last edited by sun_fm on 2023-11-1 at 10:24. Since the client has made the decision, we should follow what the client wants. From a regulatory perspective, GBT50493 specifies the range of toxic gases, which correspond to the three situations mentioned in the question (GBT50493, the list of highly toxic substances, and categories 1 and 2 for acute inhalation and dermal toxicity as well as the star-rated categories in GB30000.18); therefore, there is no need to conduct tests for toxicity of trichloromethane. From the perspective of on-site management, since trichloromethane decomposes into phosgene when exposed to heat and light, it would be more appropriate to address the toxic gases of phosgene (of course, this in turn raises the issue of emission sources). Document No. An Jian Zong Guan San [2011] 95 emphasizes that these are hazardous chemicals that require close supervision; enterprises must pay attention to matters such as emergency response plans, emergency equipment, automation, and interlock systems. This does not mean that only those substances that are toxic need to meet these requirements – do the other 59 types of hazardous substances also need to be considered toxic or flammable? *How to make AO acid AN into a solid? ）
Party A also had no choice but to give up and slack off.