A nuclear power plant was trying to understand why their new feed water pumps exhibited high vibration amplitude (1x rpm) at the drive end (DE), showed step changes in vibration over time, and demonstrated inconsistent results associated with the alignment before and after shut-downs.
Strain gauges installed
Top view bending loads. Bottom view axial loads.
Nozzle loads results summary table
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.