Originally posted by John from PA:
Respectfully, you have a machine problem and not an instrument problem. As long as the instrumentation is installed and operating correctly, you have done your job.
Personally, I am of the opinion he has both
a machine problem and an instrumentation problem.
I second John.
The protection system (hardware, software, settings etc.) failed several times to protect the machine.
The machine or process has a serious problem that led to several failures, despite the condition of the protection system.
Solving one side of the problem may not prevent the future failures. It looks a very critical machine from the illustrations posted. More "trials" should not be attempted here.
In all cases, I strongly recommend lowering the set points for both axials and temperatures if the machine will be restarted at least to trip it before a damage will take place. I would do that even if I have a qualified staff to fix the machine; unless I enjoy destroying compressors.
An axial shutdown set point of 0.7 mm (~ 27 mils) is a bit high, anyway to me. The readings on the trends shows max +0.48 mm. Or maybe I'm not able to read the plots correctly.
Also, I see a clear deviation between the axial probes , reaching >30%. (points 1702 and 1703)
Also, the readings of active thrust temperatures are quite a way from each others, by about 40% in one of the plots. (points 1722 and 1723)
By the way, repairing and operating the machine by the same staff may not easily avoid the failure, if they will go through the same procedure they used. If you are a key player in the decisions there, consider a fresh look from an outsider who is qualified and unbiased to help. It is worth it.