Browsing All Posts By Richard Thomas

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  Compressors

  Back to Basics – Rubs II

  In the first part, the author reviewed the basic concepts of rubs, symptoms that indicate a rub, and some definitions. In this article, he discusses partial contact rubbing ...

  On May 19, 2015 / By Richard Thomas
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  Compressors

  Back to Basics – Rubs I

  The following is a continuation of our previous discussion on rubs. We will begin with a brief review of some basic concepts and then give an example of ...

  On May 16, 2015 / By Richard Thomas
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  Compressors

  Shaft rubs can reduce vibration amplitude in some cases

  (Richard Thomas dealt with shaft rubs in two blog posts: Back to Basics – Rubbing or not and Differentiating between fluid induced instability (oil whirl and oil whip) ...

  On October 29, 2014 / By Richard Thomas
• Compressors

  Back to Basics: Fluid Induced Instability i.e. Oil Whirl/Oil Whip

  When a fluid, either liquid or gas, is constrained within the space between two concentric cylinders, one rotating and one stationary, the fluid in the clearance between the ...

  On August 30, 2014 / By Richard Thomas
• Compressors

  Vibration and Machinery Diagnostics

  The root cause analysis of vibration problems related to critical turbomachinery is an engineering science based on what is often referred to as the “First Law of Machinery Diagnostics”.  The 1st Law states ...

  On August 29, 2014 / By Richard Thomas