Issues regarding the interlock shutdown setting for the dry gas seal of centrifugal compressors
Thread Content
I’d like to ask everyone: for dry gas sealing, which values—first-stage inlet pressure and flow rate, second-stage inlet pressure and flow rate, isolation gas inlet pressure and flow rate, as well as first-stage leakage gas pressure and flow rate and second-stage leakage gas pressure and flow rate—should be used as interlocks to shut down the centrifugal compressor? Are there any relevant guidelines to follow? Thank you in advance to all experts for their answers!
This depends on the intended use of such devices. Please send a diagram of the centrifugal compressor; it will be easier to discuss by looking at the diagram, for reference.
Thank you for your reply. I have reviewed the API614 and API617 standards these past two days; according to these standards, for series-connected dry gas seals, the leakage pressure that triggers an automatic shutdown is specified, while for others, it is set only as a condition for triggering an alarm or starting up the equipment.
Shouldn’t the interlock for the cascade dry gas seal use the leakage amount (flow rate) as the trigger for shutdown? Could you show me the standards you checked?
It is recommended to understand it based on the actual structural principles of the device. Because standards stem from practice.