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