Let me add a few more pieces of the puzzle. Management has decried that the recycle valve will go 100% open on a trip. Based on the discharge volume being significantly larger than the suction volume, as well as, the valve throughput, the suction pressure climbs ~ 200 psi and then decays...
The plant I work at has two centrifugal compressors in parallel. The two compressors have a poorly designed surge control system such that the recycled discharge volume is considerably greater than the suction volume. Because of the volume disparities, the suction pressure spikes during a trip...
