Basic idea about antisurge control system

Antisurge control system is very important for compressor safety

What factors lead to a surge ? Start up / Shut down Reduce throughput Abnormal Conditions Trips Power loss Load changes Cooler problems turbine problems Operator error Gas Composition Changes Filter strainer problems

What happens approaching surge? Delta P across compressor rises Pd rises Flow reduces

What happens during a surge ?

Compressor loses ability to further increase pressure Flow reverses Delta p across compressor losses Thrust reversal Low frequency vibration Rising temperature inside compressor Potential effects of a Surge Compressor trip resulting in a plat shut down Compressor internal damages Compressor failure

Surging Condition Antisurging