Dear Forums members,
I am balancing a turbine rotor( HP side journal cladding work done) after completion of above repair activity, we have done re burnishing on the both journal area, electrical run out is within limit, gausse value is up to one, mechanical run out is also found ok.
Low speed balancing done @900 rpm, unbalance brought as per API 612 standard.
Initial shaft vibration (unfiltered) are 16/28 on LP side and 27/27 on HP side.
We have taken full high speed run up to over speed also , the shaft vibration are touching max. 30 micron through out the run and pedestal vibrations are less than 1.0 mm/sec.
We have rechecked the electrical run out, guasse value also again every thing found OK.
We have interchanged the probes also, but no change.
The shaft vibrations limit is 25.4 microns.
Can anyone analyze the problem and suggest the solution.