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
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