| Chemical industry or petro-chemical industry is one of the key industries for normal operation of the national economy and it is the vital material basis for the social and economic development. However, due to the characteristics of extremely-complex and large-scale production, a chemical industry or petro-chemical plant is obviously an enterprice with high risk. It is of great importance to establish and perfect safety laws and regulations as well as management systems so as to make sure that the production can go on safely. As the key technology of the safety management safety assessment techniques have been studied by many scholars both at home and abroad in the past decades.Based on the polestar of safety systematic engineering, this dissertation firstly discusses a few notions related to safety science briefly and their relationship as well. Then several widely-applied safety analysis and assessment approaches are concisely evaluated and their drawbacks are discussed at the same time.According to the systematic and scientific principles, from the point of human-machinery-environment model, a study was carried out on the establishment of safety assessment indices system. At the same time, quantification method of assessment indices is Probed into.The fuzzy mathematics is a new subject. It is according with the rule which impersonal things develop to bring the theories of fuzzy mathematics to the area of system safety assessment. Then the thesis introduces the method of fuzzy cluster analysis, and take pratical assessment with the method of fuzzy cluster analysis for synthetic ammonia installation of Da Lian Chemical Group.Then LEC is used in synthetic ammonia installation to verify the effectivity fuzzy cluster analysis.
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