J
We have three gas turbine of model-MS6001B. we are facing problem in one of gas turbine regarding high vibration since back 2 years. so we are not able to load more than 18 mw. so as per OEM recommendation in recent MI we replace turbine rotor, All 9 cpital spares with uprated compressor blade and IGV, exhaust casing and also uprate our machine to PG 6581 model. Then we started our machine and same is loaded up to 35.6 mw with max. vibration 8.8. but after running of 10 days. brgg-2 metal temperature start increases, then we took shutdown of machine and found BRG-2 in damage condition. now our doubt is can electrical discharge damage BRG-2. or please suggest what may be root cause for that.