I. Classification of Danger According to the nature of danger and the severity of possible consequences, the danger is classified, which is called danger classification. The so-called danger is an existing or potential state, which may lead to accidents or misfortune as soon as it appears. Danger is the opposite of security.
Foreign risk classification methods: as far as foreign risk classification methods are concerned, there are mainly the following three categories: ① according to the experience and lessons of past accidents in the same system or similar systems, the classification level is stipulated; ② Risk assessment with safety factor or safety valve value; ③ Evaluators assign a series of numerical scales to evaluate risks according to past experience and their own opinions.
Domestic risk assessment methods: the most widely used method is the safety checklist evaluation method, followed by the system comprehensive evaluation method, fuzzy evaluation method and safety grade coefficient method.
Two, the occupational hazard classification standard is a combination of qualitative and quantitative management evaluation method. At present, China has promulgated eight occupational hazard classification standards, of which 1. The classification standard divides occupational hazards into five levels, namely: level 0 (safe operation, allowable risk), level I (light hazardous operation, allowable risk: based on strengthening personal protection and regular monitoring), level II (moderate hazardous operation, moderate risk), level III (highly hazardous operation, significant risk) and level IV (extremely hazardous operation, unbearable risk). According to different hazard levels, different supervision and management measures are implemented.