Risk assessment methods
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The six-stage safety evaluation method for chemical enterprises formulated by the Ministry of Labor of Japan is an evaluation method suitable for chemical equipment. The six-stage evaluation method includes six stages: data preparation, qualitative evaluation, quantitative evaluation, safety measures, re-evaluation using past accident data, event tree and accident tree evaluation. The risk assessment method is the third stage of the six-stage safety assessment method for chemical enterprises. The introduction of the risk assessment method is as follows: Combined with our country * * Standards GB50160-1992 "Petrochemical Enterprise Design Fire Protection Code" (1999 revised edition), "Classification of Toxicity Hazards and Explosion Hazard Evaluation of Chemical Media in Pressure Vessels" (GB20660-2000) and other technical specifications standards divide the evaluation objects into evaluation units, and evaluate the five contents of each unit, including substance, capacity, temperature, pressure and operation. Each item is divided into four types: A, B, C, and D, which correspond to different points. Calculate the score of each unit according to its prescribed scoring standards to evaluate the risk level of the unit. In order to guide enterprises to take corresponding regulatory measures for different units. The risk evaluation values and risk classification standards are shown in the table below. Risk evaluation table score items A (10 points) B (5 points) C (2 points) D (0 points) Substance (the most dangerous and harmful substance in the unit) 1. Class A flammable gas ； 2. Class A substances and liquid hydrocarbons ； 3. Class A solids ； 4. Extremely hazardous media. 1. Class B flammable gas ； 2. Class A, B and B A flammable liquids ； 3. Class B solids ； 4. Highly hazardous media. 1. Category B, C-A, and C-B flammable liquids ； 2. Class C solid ； 3. Medium and mild hazardous media. Substances that do not fall into items A, B, or C described on the left. Capacity 1. Gas 1000 m3 or more ； 2. Liquid 100 m3 or more. 1. Gas 500-1000 m3 ； 2. Liquid 50-100 m3 or more. 1. Gas 100-500 m3 ； 2. Liquid 10-50 m3. 1. Gas
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my country's current risk assessment draws on Japan's six-level legal quantitative and qualitative assessment method http://bbs.hcbbs.com/thread-185649-1-8.html Japanese risk assessment method http://bbs.hcbbs.com/viewthread.php?tid=201477 my country's current risk assessment draws on Japan's six-level legal quantitative and qualitative assessment method http://bbs.hcbbs.com/thread-275505-1-5.html my country's risk assessment table score item A 10 points B 5 points C 2 points D 0 points Substance (the most harmful substance in the unit) ① Class A combustible gas ② Class A liquefied hydrocarbons ③ Class A solid ④ Extremely hazardous goods ① Class B flammable gas ② Class A B and B A flammable liquids ③ Class B solid ④ Highly toxic goods ① B, C, AB flammable liquids ② Class C "solid" ③ Moderately and mildly toxic substances are not classified as ABC substances Capacity ① Gas 1000m3 or more ② Liquid 100m3 or more ③ Gas 500-1000m3 or more ④ Liquid 50-100m3 or more ⑤ Gas 100-500m3 or more ⑥ Liquid 10-50m3 or more ① Gas < 100m3 or more ② Liquid < 10m3 or more Temperature 1000℃ or above Operating operating temperature ≥ Ignition point 1000℃ or above Operating operating temperature < Ignition point 250℃-1000℃ Operating operating temperature > Ignition point operating temperature < Ignition point < 250℃ Operating operating temperature > Ignition point operating temperature < Ignition point pressure 100MPa 20-100MPa 1-20MPa <1MPa Operation ① Particularly violent exothermic reactions "halogenation, nitration" ② Operation within the explosion limit ① "Medium" exothermic reactions esterification, addition, oxidation, polymerization, condensation reactions. ② It is dangerous when air enters the system ③ Use of dust and mist materials ④ Single batch operation ① Slightly exothermic reactions hydrogenation, water mixing, isomerization, sulfonation, neutralization ② Reactions during refining ③ Single batch operation ④ There is some dangerous operation No dangerous operation
“If it involves Class A substances or liquefied hydrocarbons, should the capacity be divided according to gas or liquid? 2. If the substance is a solid, how to determine its capacity score? ” What's your answer to this question? My brother is also in trouble...
About capacity calculation: Capacity can only be calculated based on geometric volume! About solid matter: Directly converted to solid volume! Generally speaking, you can calculate based on the melted solid, because the volume difference between solid and liquid is not big. From the starting point of protecting intermediaries, I personally think that they should be accumulated according to the state of large volume! Safety is no joke, and strict requirements make sense.