As I know for the centrifugal compressors, the stonewall protection is an optional protection (is not mandatory same as Anti-surge protection). However operating in the stonewall condition also damage the compressor so I am thinking if there is no stonewall protection, maybe it should be just relied to the operator action to trip the compressor. In this basis I have two questions:
1) Does it need to trip the compressors in case of stone wall?
2) if yes and compressor does not have stonewall protection, which alarm will be activated for operation attention ( e.g. : high compressor vibration) ?