Field Balancing in the Real World: Part 2

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This paper is a follow-up to an earlier paper, Field Balancing in the Real World, which was presented at CSI Reliability Week 1997 in Nashville. Case studies of excessive vibrations on fans at ORNL will be discussed. Except for a few small sections from the earlier paper, this paper is entirely new. The case studies are new. As in the first paper, all fans are rigid-rotor type fans. Normal operation, therefore, is at less than the shaft's first critical speed. The presentation of case studies with root cause problems other than unbalance is a major departure from the first paper. ... continued below

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Bracher, R.K. & Surrett, C.L. October 6, 1999.

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This paper is a follow-up to an earlier paper, Field Balancing in the Real World, which was presented at CSI Reliability Week 1997 in Nashville. Case studies of excessive vibrations on fans at ORNL will be discussed. Except for a few small sections from the earlier paper, this paper is entirely new. The case studies are new. As in the first paper, all fans are rigid-rotor type fans. Normal operation, therefore, is at less than the shaft's first critical speed. The presentation of case studies with root cause problems other than unbalance is a major departure from the first paper. We believe they belong here, since unbalance is suspected most of the time when a fan is vibrating excessively, even when it is not the root cause. In reality, unbalance is the underlying cause of the excess vibration on fans we have fixed at ORNL only about half the time. Furthermore, the analyst's credibility could be called into question upon an unsuccessful attempt at field balancing when underlying causes are later discovered and fixed. A demonstration will follow the case study presentation. The additional tests described in this paper to confirm centrifugal force (probable unbalance) will be performed.

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OSTI as DE00014351

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  • Computational Systems Inc. Reliability Week, 1999, Orlando, FL (US), 10/04/1999--10/08/1999

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  • Report No.: ORNL/CP-104901
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 14351
  • Archival Resource Key: ark:/67531/metadc623203

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  • October 6, 1999

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 25, 2016, 12:15 p.m.

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Bracher, R.K. & Surrett, C.L. Field Balancing in the Real World: Part 2, article, October 6, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc623203/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.