Two identical MG sets used in a nuclear plant were vibrating differently, one above allowable limits. MSI performed field testing to discover that the rubber mounts were at fault and an immediate shut down was avoided.
lags in picture show ODS points acquired.
Click image to animate.
Wedge inserted under baseplate to shift natural frequency.
FFT plot showing the natural frequency difference between MG sets.
A steam turbine at a waste-to-energy facility in the Northeast underwent a scheduled repair, at which time the turbine bearings were reworked, after which the turbine periodically experienced very high amplitude shaft vibrations.
A boiler feed pump (BFP) driven off of the main steam turbine via a fluid drive was experiencing high vibration levels leading to frequent replacement of the fluid drive bearings.
MSI was contracted to understand and help solve a high vibration problem on an aero-derivative gas turbine driven generator.