Dear Fellows,
Recently we are facing high vibration of Turbo Expander,
Actually few days before when we started the unit after completion of annual turn around, the expander side Y/X vibration increased to 1.1mils/0.9 mils from previous value of 0.42/0.40 mils. similarly Recompressor side Y/X vibration were also increased to 0.80/0.78mils from 0.20/0.20 mils.in ATA we just replaced the lube oil with the similar grade as it was before and cleaned the inlet strainer of expander and recompressor.
the Turbo Expander is used for cooling down natural gas from -30F to -111F with inlet/outlet pressure of 930 psig/300 psig.
Could you people list the probable causes of this rise in vibration.
Regards,
Kashif