March 2015

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HP Engineering Case Histories: Case 83: What are useful questions to ask before starting a vibration analysis?

Periodically, this author receives questions from readers throughout the world addressing what performance issues could be wrong with a centrifugal compressor that is vibrating. Note: It is impossible..

Sofronas, A., Consulting Engineer

Periodically, this author receives questions from readers throughout the world addressing what performance issues could be wrong with a centrifugal compressor that is vibrating. Note: It is impossible to accurately diagnose problems remotely from the compression system; a specialist doing an onsite review is highly recommended. For newer industry equipment engineers, here are some useful guidelines to follow when preparing for an onsite investigation:1 Are you sure that the machine vibration is excessive? How do you know (quantify) what is excessive for this compressor? Baseline data on what is normal vibration for the machine is always a useful tool. Do not use vibration limits tighter t

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