Centrifugal Compressors experience a phenomenon called “Surge” which can be defined as a situation where a flow reversal from the discharge side back into the compressor casing causing mechanical damage.
The reasons are multitude ranging from driver failure, power failure, upset process conditions, start up, shutdown, failure of antisurge mechanisms, check valve failure to operator error to name a few. The consequences of surge are more mechanical in nature whereby ball bearings, seals, thrust bearing, collar shafts, impellers wear out and sometimes depending on the how powerful are the surge forces, cause fractures to the machinery parts due to excessive vibrations.

Important parameters for Anti Surge Valve Sizing is as follows:

1. Characteristics
2. Location
3. Size
4. Response Time
5. Actuator Type


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