How long have the bearings been stored, installed or operated?

the bearing was stored after removal from the machine for 20 days, it just serve for nearly one month then the pump was standby for 2 months and the problem happened we notice abnormal sound and vibration and the oil seems to be not in good condition the analysis show contamination with ferrous particles and no water content
thanks

When you mention high vibration, is this from your Vibration analyst? Did they see any indication of false brinelling? Did the rollers in this bearing show any sign of axial marking? Do you have any pics after the bearing was cleansed?
(2) months is a extremely long time for a unit to sit in standby without rotation..

yes the vibration analyst report for Very high FT frequency and multiples bearing in spectra with high bed energy, Clear impacting/ knocking in free end bearing in time waveform also high G's, i attach another pic and yes some rollers have an axial marks i think they appear in the pic attached

to me it looks like water might be the cause of the damage. the fact that no water was found in a luboil sample not necessarily means there was no water present or has not been present for a while within the bearing.

if the bearing was stored within a rather moist atmosphere condensation may have taken place and may have caused corrosion.

are you certain that when the bearings were installed after the storage they were in good condition?

3adli,

With the information you supplied and the pictures, it "may" be possible that you have indications of fretting corrosion. Hard to be definitive without actually seeing the details. Do all the rollers show the same markings? What does the outer race show?