The manhole sealing performance of a kettle agitator directly affects the production efficiency and safety of the whole pressure vessel. This paper investigated the market demand for the reliability of manhole seal rings. First, the objective weight was determined by the rough set method and the subjective weight was determined by an analytic hierarchy process. The subjective weight and objective weight were integrated organically to obtain a scientific and effective comprehensive evaluation model. Then, the method of Quality Function Deployment is applied to transform the user requirements into the technical characteristics of the seal ring. The technical characteristics of the sealing ring are converted into the influencing factors of the reliability of the sealing ring by the transformation matrix, and the weight of the factors is determined according to the triangular fuzzy number. Finally, the most important factors affecting the reliability of the seal ring were studied by finite element analysis. This paper provides a theoretical basis for studying the reliability design of seal ring.
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