Storage tank accessories are the core components that ensure the safe operation, precise management and efficient maintenance of storage tanks. Different accessories have clear divisions of labor and work in coordination with each other, covering the five core demands of "pressure balance, measurement and monitoring, safety protection, maintenance and repair, and medium purification". The following summarizes the core functions of manholes, oil measurement holes, filters and other key accessories from the perspective of functional classification, and clearly presents the positioning of each accessory in the storage tank system: