| 摘要 |
Abnormality in an amount of a working gas leaked from between a rotating ring adapted to rotate with a rotor and a stationary ring of a turbo fluid machine is detected by a pressure switch and a flow meter, which are provided in a primary seal vent line, the working gas leaking from sealing surfaces of the labyrinth seal and the secondary dry gas seal, together with a purge gas purged to the space from outside is discharged outside the machine from a flow passage via a space. When abnormality generates in the secondary dry gas seal, a control valve provided in the purge gas line operates to secure a flow rate in the purge gas line, so that a flow rate detected by the flow meter provided in the purge gas line increases, and thus abnormality in the secondary dry gas seal is detected.
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