Power Turbine Field And Shop Balance Experience
Date
2022Metadata
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A power turbine (PT) experienced a high 1X vibration issue. Balancing was attempted at two accessible planes on the shaft section. However, the unit could only operate with vibration below the alarm level in steady-state condition while experiencing over 10 mil pp and 1 in/sec pk in transient condition, which is not acceptable. A decision was made to remove the PT section for workshop balance. Indeed, excessive unbalance was measured on it at workshop and then reduced by 97%. Vibration level became very low afterwards at both conditions. From the current case, weight sensitivity or influence data was obtained with respect to the PT section plane. This makes it possible in the future to add correct weights at the PT section on-site without having to ship it for workshop balance. The lesson learned here is that obtaining balance influence data from available balance planes at all different running conditions is very important to see if it is feasible to reduce vibration to an acceptable level at all these conditions by using the available balance planes. If not, an alternative must be found, instead of vain attempts.
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Citation
Yu, John J.; Kirker, Michael; Peton, Nicolas (2022). Power Turbine Field And Shop Balance Experience. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station; Texas A & M University. Libraries. Available electronically from https : / /hdl .handle .net /1969 .1 /197691.