Hi friends we are facing high temperature issue in Water feed pump NDE ball bearing (7309 ( 2 bearings Back to back arrangement)).
Pump specifications are given below
Rated pressure 11 Bar
Sump lubrication type
Overall pump vibrations are well within the limit ( 4 mm/s rms at POV)
We have dominant frequency at 1X, 2X along with 6X(VPF).
Pump NDE bearing reached to 60 degrees within 2 hours of operation whereas Pump DE bearing temperature found as 45 degrees. All other identical pumps maximum Pump DE & NDE temperatures are found as 44 & 45 degrees.