Industrial standards do not required any NDE tests that has to be performed on large induction motor sleeve bearings as a part of preventive maintenance activities. In our facility we has performed NDE test (UT and PT) since 2010.
We use ISO 4386-1 and ISO 4386-3 standards for acceptance criteria. We chose conservatively class B for our acceptance criteria. In few years we found out that most of our sleeve bearings are out of acceptance criteria.
So, I am looking forward to hear industrial experiences especially from NPP on this topic. Do anyone performs NDE (UT and PT) tests on sleeve bearings? How often do you perform NDE tests? What standard do you use for acceptance criteria.