Piping Vibration Assessments

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By Jacob Manuel, P.E. at Stress Engineering Services, Inc., and Ralph E. King P.E. at Stress Engineering Services, Inc.. This article appears in the July/August 2016 issue of Inspectioneering Journal

Introduction

Process piping is typically designed for pressure, temperature, gravity, and wind loads that are applied slowly and evaluated statically.  The load history for the piping is applied slowly to allow the piping system to respond and thus remain in equilibrium. For some small subset of piping systems, loading due to flow, process conditions, or other dynamic effects can cause piping vibration.  Excessive vibration may cause fatigue failure at pipe weld connections, equipment nozzle and pipe interfaces, pipe supports, or appurtenances such as vents, drain gage lines, or instrumentation.

Figure 1. Modal Vibrations in a Piping System.Figure 1. Modal Vibrations in a Piping System.

The dynamic loading encountered in process piping typically falls into two categories:

  1. Steady-State Piping Vibration
  2. Transient (non-steady state) Piping Vibration
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Comments and Discussion

Posted by Vivek Viswanathan on August 25, 2016 . Edited on August 25, 2016
Thank you Jacob and Ralph for the article. We... Log in or register to read the rest of this comment.

Posted by Jacob Manuel on August 30, 2016
Vivek, Thanks for your comment. SPL... Log in or register to read the rest of this comment.

Posted by Jagdish Rao on August 30, 2016
Jacob thanks for your help. This system is in the... Log in or register to read the rest of this comment.

Posted by Judson Parkin on October 24, 2016
Thank you for the article, Although it was... Log in or register to read the rest of this comment.

Posted by Vivek Viswanathan on October 24, 2016
Judson, we normally use the RMS velocity vs.... Log in or register to read the rest of this comment.

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