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@JJPellin, Thanks for the update. The rotor was re-furbished 1.5 years back and all checks (Mechanical/Electrical run-out, Magnetic checks) were satisfactory. The high speed balancing also been carried out during re-refurbishment. The rotor was stored in a storage container (unpressurized)...

Hello guys, Would appreciate a kind response for the above. Many thanks!

Hi folks, We've a vibration issue issue with the startup of a newly overhauled 4 stage compressor bundle. Make: MHI Operating speed : 13K Minimum governance speed App. 9.5k On startup, the DE vibration jumped to 24 microns and 22 microns all of a sudden during ramping up (Alarm: 35 microns)...