Record when the movement occurs
Does vibration begin during air admission, valve changeover, the end of discharge or receiver filling? Relate observations to the PLC event log and pressure trends. A short video taken from a safe location can help describe movement, but measurements and inspection are needed to identify its cause.
Review the whole route
Check supports, anchors, expansion provisions, unsupported spans, abrupt direction changes and any gas-liquid separation arrangement. Confirm that the installed pipework matches the approved layout. A separator may address a particular gas-liquid behavior, while a support change addresses structural response; one is not a universal substitute for the other.
Do not tune around an unsafe condition
Avoid repeatedly increasing pressure or changing valve timing without understanding the transient. Such changes can alter loads and create a different problem. The responsible engineer should assess the operating sequence, expected forces and pressure limits. Any modification affecting protection or pressure equipment requires the appropriate review.
Verify the corrective action
Compare trends and observations before and after the approved change at the same product condition and throughput. Check several complete cycles and credible startup or stop conditions. Keep the revised drawings and control parameters with the maintenance record. Successful correction should be demonstrated under the operating envelope, not just one favorable cycle.
General engineering guidance. Numerical examples are illustrative; project specifications and acceptance criteria are agreed for the actual duty.