MECHANICAL ANALYSIS OF A 25MW TURBINE PROJECT The vibration level of the turbine remained low until reaching half load, when the vibration spiked unexpectedly and the machine tripped. Verico reviewed the overhaul work and data from the vibration spike and trip. The fault was identified as an oil whip caused by the bearing being unloaded by the partial arc steam admission to the turbine. Exacerbating factors included the bearing journals being machined during the overhaul to the minimum diameter allowable and a combination of the as left alignment of the machine and the very good balance condition. Oil whip as a result of increasing machine load such as this is uncommon. Commonly oil whip is a condition seen during transient machine operation, as an oil whirl latches ont

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