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OPERATING DEFLECTION SHAPE ODS (FAN CASE STUDY)  An unspared process fan had exhibited high vibration levels for several months. A request was received to investigate the root cause of the high vibration. The vibration data indicated high level s of fan bearing housing vibrati on primari ly in the axial direct ion. Plant operations had concerns about the reliability of the fan since it was unspared and the plant was operating at capacity. An outage was not scheduled for several months. An inspecti on of the fan, base and foundat ion was conducted, as well as collection of vibratio n data for an operational deflection shape (ODS) model. The test results identified a resonance of the fan pedestal and frame caused by an inadequate number of anchor bolts and deteriorated grout. Installation of additional structural elements and anchor bolts along with grout repair re duc ed vi br at ion 85 per cent. This ar ti cl e descri bes the anal ys is pr ocess, fi ndi ngs and modifications. Background The fan was an AMCA Arrangement #9, see Figures 1 and 2. The fan and motor were mounted on a six-inch channel frame that was grouted using cementitious grout and anchor bolted to a concrete base. Vibration levels at the fan bearing housings, especially in the axial direction, were a concern. The axial vibration levels were high, but slightly different on each bearing. Both axial readings were in phase at running speed as determined by cross-channel phase readings. This vibration pattern is not typical for a belt drive. Most vibration was at the fan shaft rotational frequ ency. There was concern expressed about possibl e thrus t loading generated by the fan and the potential effect on bearing life reduction. Figure 1

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