Desertfox is asking the right question. The #1 cause of 1X vibration is bad alignment. Have runout measurements been taken all the way down the shaft and above and below each flange during assembly? Is the shaft plumb? Are you certain the impeller is concentric to the shaft and seals? What...
Magnetic imbalance would cause radial loading and fail the guide bearing, not the thrust bearing. Do a full alignment check of the thrust runner and check the check valves if you have high pressure oil lift.
I have a few lube oil lines being replaced and the spec calls for an air pressure test which I know to be dangerous. Is this standard for oil pipes or would it be better to run the test with the oil?
I don't think we want to use water, as we'd never get it all out, and if we used oil it could...
