Base on the main problem of vacuum ejector waste system, this paper set out overhaul flow chart and raise check and overhaul method.
根据污物收集系统的常见故障，列出了检修流程图，提出了检查方法和检修要点。
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The vacuum system process of PET unit, the design of EG steam ejector shape and support, the selection of support spring and the main points in the ejector pipe design are introduced.
The essential performance had been achieved by testing through changing boundary layer ejector pumping capacity, mixing chamber clapboard length, the counterpressure, main inlet mass flux and so on.