Field case · Condition monitoring
Closed-cycle pump: acceleration at the non-drive end, a 123 Hz envelope line, and a small spall on the inner race
Quick answer
A closed-cycle pump showed high acceleration at the non-drive end while overall velocity looked acceptable. The envelope spectrum showed a line at about 123 Hz with harmonics. The deep groove ball bearing was changed and a small spall was found on the inner race.
What the case covers
- The pump
- The survey
- What the survey table showed
- Reading the numbers
- The teardown
- What to take from it
Takeaway. Overall velocity passed this bearing. High acceleration, a defect indicator and a 123 Hz envelope line found the spall.
Read the full case, with the data and the numbers