Among the key turbomachinery tests are mechanical run test, string test, full load full pressure test and the verification test.
Below are excerpts from a paper “Shop rotordynamic testing — Options, objectives, benefits and practices” by John A Kocur and C Hunter Cloud presented at the third Middle East Turbomachinery Symposium.
The mechanical run test as required by API is primarily a vibration level check. Measured at the probes located at the journal location, vibration levels are checked against the specified limit for both overall and non-synchronous components. General mechanical performance is also examined including bearing temperatures, close clearance rubbing and seal performance typically up to maximum continuous speed (MCS). Supercritical behavior is examined by determination of the amplification factor and separation margin of typically the 1st critical speed. (Obviously, the behavior of modes above MCS remains undetermined.)