What is Surge ?

Inherent characteristic of compressor occurs when compressor is unable to overcome the pressure of plant air system. Surge may occur due to off design conditions or abnormal control operation. When it is in surge, air flow reversal occurs as the compressor tries to produce flow against the back pressure of the plant air system. This is normally associated to the sudden cut off’s or  the compressor or the compressor running beyond capacity.
Surge occurs:-
·         When compressor can’t overcome system resistance (flow reversal happens)
·         Excessive discharge pressure
·         Excessive suction throttling

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