Dry Gas Seal Systems For Centrifugal Compressors

摘要

Identifying the most appropriate seal type is vital to compressor health Dry gas seals are an integral part of modern centrifugal compressors. Specifying engineers sometimes do not give enough attention to the scope, definition and selection of the most appropriate gas seal type, its control system and auxiliaries for a given service application. Several parameters such as the composition, the thermodynamic state conditions of seal or buffer gas, the type of barrier gas, the situations requiring a slow roll, suitability for bidirectional rotation and the system rating must be evaluated before finalizing the design of a dry gas seal system. Ideally, this review should involve the vendor with the unit responsibility, the gas seal manufacturer, and the machinery engineers who work for the machine owner and engineering contractor. Selection of the right type of dry gas seal and its support system contributes to longterm reliability and availability of process plant centrifugal compressor trains.