CAESAR II Webinar Series: Dynamic Piping Analysis

David Diehl

with David Diehl, P.E., CADWorx & Analysis Solutions

If you’re new to CAESAR II, you may have missed the four-part Dynamic Piping Analysis webinar series hosted by David Diehl. These value-packed webinars, originally presented 2011-2013, are some of the most requested recordings in our library. See why for yourself.

Topics covered include:

  • Modal Analysis
  • Harmonics
  • Seismic Analysis of Piping Systems by the Response Spectrum Method
  • Time History Analysis

Dynamic Piping Analysis

Part 1: Modal Analysis
Date: May 26, 2011
Cost: free eSeminar

View the recorded webinar here

This opening session focuses on modal extraction – the first step in most dynamics evaluation and a building block in all modal analyses. A brief review of dynamic concepts used here will be followed by a review of the modal analysis input parameters. The accuracy of the (static input) piping model is discussed. Finally, using the natural frequency calculation as a simple screening tool for system reliability wraps up this presentation.

Part 2: Harmonics
Date: January 30, 2012
Cost: free eSeminar

View the recorded webinar here

Cyclic loads of even small magnitude can damage piping systems and most shaking pipe is a cause for concern. CAESAR II can be used to replicate piping response to these harmonic loads. Once the computer model matches the physical system, the model can be confidently adjusted to de-tune the response. The focus here is this forcing-frequency-to-natural-frequency ratio and not on evaluating a calculated fatigue stress amplitude. This webinar develops the CAESAR II input required for harmonic analysis and the engineering concepts involved.

Part 3: Seismic Analysis of Piping Systems by the Response Spectrum Method
Date: November 29, 2012
Cost: free eSeminar

View the recorded webinar here

Seismic analysis by the response spectrum method is a form of modal analysis. Each system mode of vibration is independently excited by the seismic event and then these modal responses are combined. This webinar develops the CAESAR II input required for seismic analysis using the response spectrum method – setting and entering the response spectrum, defining the shock magnitude and direction, and specifying the modal combination method. Basic dynamic analysis and engineering concepts will be used in developing this input. CAESAR II dynamic output is quite helpful in confirming the correctness of the model and in diagnosing problems. This output is reviewed to highlight these advantages.

Part 4: Time History Analysis
Date: October 17, 2013
Cost: free eSeminar

View the recorded webinar here

Time history analysis provides the most realistic specification of dynamic loads in CAESAR II. The program’s modal time history analysis can simulate system response to several force-versus-time events. This approach is best suited to represent well-defined transient events traveling though the piping system such as pressure waves associated with a fluid hammer event. (In many cases, because of its exact event modeling, time history serves more as a forensic analysis tool rather than an initial design tool.) This webinar develops the CAESAR II input required for time history analysis – setting and entering the time history and load vectors and, perhaps more importantly, set the proper CAESAR II “Control Parameters” for the analysis. The program results are also be reviewed to highlight added capabilities there. Basic dynamic analysis and engineering concepts are used in this presentation.

Speaker bio:

David Diehl graduated with a BSME from Lehigh University USA in 1976. Upon graduation he took a post as a technical support representative for Auton Computing in New York City. After four years David relocated to Houston, Texas providing technical support for Auton’s Dynaflex – a mainframe-based piping system analysis program. In 1986, he took a position at Intergraph CADWorx & Analysis Solutions (COADE, Inc.) introducing and selling CAESAR II – the world’s first PC-based pipe stress analysis package. While at ICAS Dave earned his Professional Engineering license and served as the product manager for CAESAR II. He currently manages CADWorx & Analysis Solutions training and is the lead instructor for CAESAR II and the principal author of the CAESAR II on-line training course (available at www.pipingdesignonline.com). Dave joined the B31.3 Process Piping Committee in 1999. He now serves as the Vice-Chair of that committee and a prior Chair of the B31.3 Subgroup on Design. He also served 16 years on the Board of Directors for SPED – the Society of Piping Engineers and Designers.

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