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Situation – A 30 year old, 35 MW steam turbine generator was overhauled, during which
both the turbine and generator were repaired. A 3500 monitoring system and 3500 operator display
were installed on the unit. During the first start-up, high shaft vibration was detected on the turbine.
Solution – Start-up vibration data was taken by a third party consultant using a Bently Nevada™
ADRE® system. The data was sent electronically to Bently Nevada™ Machinery Diagnostics Services (MDS) team,
who remotely analyzed it.
Result – A partial rub on the high-pressure turbine was diagnosed. The turbine OEM made rotor movement tests
that confirmed the clearances were too tight. This led to the machine being opened and clear marks from the
partial rub discovered. Because of the quick analysis, the rotating parts were in good enough condition
to start the machine after the turbine stator inner parts had been realigned.
As a result, significant savings were estimated at US$3 million.
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