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Reply to "High Vibration on bearing #2 and #3 on gas Turbine frame 9E (100 MW)"

Ahmad alfakeer posted:

Dear all 

We have an issue  high vibration on BRG #2&3 ,  finish the Major Inspection on this unit when we start the unit , at FSNL ( 3000 RPM ) the vibration for BRG # 2&3 stable not exceed (6 mm/s ) , when the unit is loaded the vibration increase on BRG 2&3 Only , at full load the Vibration reach on BRG # ( 9- 13 mm/s fluctuating ) and BRG #3 ( 7- 8.5 mm/s ) , and in the MI inspection we made casing Alignment as recommended from  manufacturer GE because when open the unit we found the BRG # 2 is damage from Upper haif and BRG # 3 is damage on lower haif and there is oval on AFT compressor casing and before open unit the vibration on BRG # 2 reached ( up to 19mm/s ) , all bearing replaced BY new ones and the vibration still , please to advice me to know what is the cause of vibration .

note : all vibration on BRG # 4 & 5 are smooth not exceed  (2mm/s )at Full load 

thanks in advance 

please to help me ???

RM
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