with Tony Paulin, PAULIN Research Group
Date: July 17, 2013
Duration: 1 hour
Cost: free eSeminar
In this webinar, Paulin Research Group will demonstrate four examples of how using the FEATools™ programs can improve the applicability of both CAESAR II models and CAESAR II analysis results. The four examples that will be shown and discussed in detail are:
- Using FEATools™ to calculate more realistic pump discharge loads
- Modeling challenges of small bore branch connections
- Branches in “tight” piping systems
- Pressure and multiple case load cycling
Each example will involve a common piping design/analysis issue that can often lead to either overly conservative results or non-conservative results. The core issues with each example will be discussed, and then a demonstration of how the FEATools™ programs can be used to address these issues and improve results quickly and confidently. A more detailed description of each example is provided below.
Using FEATools™ to calculate more realistic pump discharge loads
Focus on flexibilities is often involves the branch, but in tight piping systems the run flexibilities can also contribute to load reduction. In the vicinity of pumps the smaller loads can help avoid the placement of difficult to construct supports and rerouting of pipe.
Modeling challenges of small bore branch connections
There are several known problems with small bore branch connections. These include the calculation of stress in the run pipe, and proper modeling of the stiffness of the branch pipe. This example details these differences and ends with a dynamic analysis showing how proper stiffnesses can have an effect on calculated natural frequencies and when excitation frequencies cause resonances. FEATools™ is used to modify the CAESAR model to get more applicable results.
Branches in “tight” piping systems
This example shows a typical tight piping system where the boundaries are considered rigid. The result shows how each of the moment contributions can change and what affect this has on the stress at the junction. The conservative assumption of rigid end connections is shown to not require rerouting of the pipe. The CAESAR model is modified by FEATools and shown to be OK.
Pressure and multiple case load cycling
There are several design situations where the B31.3 Code has requirements for evaluation without providing specific approaches. One of those situations occurs when pressure cycles. FEATools™ provides numerous options for performing a pressure cycle analysis to support the CAESAR II design of piping systems. During analysis of piping branch connections, when the pressure cycles, external loads can also cycle. It is important to recognize when these load changes contribute only to the equivalent number of cycles, or when they cause conditions where stress states are additive. The model used for the first example will be used to show how different directional loads can be combined with pressure and the expected result. These detailed results are difficult to provide with a beam analysis where the actual maximum location of high stress around a branch connection is unknown.
Tony Paulin has dedicated his life to creating and helping engineers apply the best and most advanced technology to the fields of piping and pressure vessel design and analysis. In 1991 he founded Paulin Research Group (PRG) to develop FEA-based software programs for use in the PV&P sector. Under Tony Paulin’s direction, PRG performs consulting, training, and physical lab testing to confirm both the software’s accuracy and usability. He regularly presents papers and findings at industry seminars and conferences. Some of Mr. Paulin’s key accomplishments include:
• Original Author of the CAESAR II© Pipe Stress Analysis Program
• Co-Author of the FE/Pipe™ & NozzlePRO™ Finite Element Analysis Programs
• Co-Author of the new PCLGold™ Pipe Stress Program with applied FEA Technology
• Co-Author of BOS Fluids Steady State and Transient Fluid Flow Simulator
• Member of the B31 Mechanical Design Code Committee (1994 to Present)
• Past Recipient of the South Texas ASME Herbert Allen Award for Outstanding Technical Achievement