Kindly please suggest me for Abnormal peaks vibration
My Fertilizer Plant has a Hydraulic Turbine (the HPRT) connected to a motor by a clutch, plays an important role in energy consumption reduction.
1. HISTORICAL BACKGROUND
High vibration on the HPRT has been noticed since 2014. It was recorded abrupt increase, continuously and unstable high vibration on DE and NDE hydraulic turbine side in a certain period so we stop the HPRT for along time.
Machine has been three-times modification of the suction piping system. The last overhaul after the third piping modification and commissioning in Nov 2018 was found the cracked shaft at turbine. Machine was run again sucessfully on 16 Apr 2019 after replaced new shaft at turbine.
2. In recent days, we found abnormal high peak vibration at dominant frequency is 1X, hamonic and 1X phase lag change 90 degrees. It is surprising to see NDE vibration reading tended increase up to 75 um while DE decrease. please look at attachment for detail.
We suspected 1X phase lag change 90 degrees to be caused by readjusted/shifted clutch when turbine’s speed fluctuation. Do you have any opinions and suggestion for our action?
Thanks in Advance