Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Attention: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> This help has been provided in order to give users ideas for modeling typical piping arrangements. The steps shown in each example should not be taken as the only method available to create models. In addition, the intent of the examples is to present ways to create adequate models of specific piping components for analytical purposes. Anchor Bends Cuts: Cold Spring Flexible Joints a. Single Bellows Expansion Joint b. Tied Bellows Expansion Joint c. Tied Universal Expansion Joint d. Hinged Expansion Joint e. Gimbal Expansion Joint f. Slip Joint g. Ball and Socket Joint h. Pressure Balanced Expansion Joints Frames Hangers Nozzles Pipes Reducers Rotating Equipment Supports Tees Valves Vessels Comments, Questions, and Answers: Item #1: Flexible Joint Dialog Explained Item #2: For flexible joints, how to apply define coefficient of thermal expansion, and where it is defined? Item #3: Where can I input the material of the flexible joint? Item #4: Wh en modeling the Tied-belows example using Tie/Link supports. The tie/links allow the pipe to move father apart than the length of the tie/link with all gaps = 0.00. Answer: November 2014: Correct a tie/link support does not maintain arc swing length. However, they do maintain the distance between tie rod ends where the main control function is to maintain the flanges parallel. No program including Caesar will arc tie rods and even if it does would be insignificant change in the expansion joint behavior. Item #5: Can you send me an example model of a bellows than what is available in the online help: Item #6: How do I model Flex / Braided hose: Item #7: When modeling a flexible hose, what is the most realistic way to model the curved flex hose. Using 1 flex joint, 2 flex joints or many flex joints? Item #8: Per the Flexible Joint online help, how to perform a "rigorous pressure extension analysis" in AutoPIPE? Item #9: How to model a Penetration Seal Bellows Joint in Autopipe (see image below). Item #10: How to model a Hyspan Barco Ball Joint? Item #11: How to best model the bending stiffness and torsional stiffness of the ball joints. Item #12: How to model a Ball joint in AutoPIPE? Item #13: I have a model that shows the code stresses > 1 for the thermal load. How do I get the stresses to become less than 1 or lower than manufacture allowable? I would have thought the expansion joints would help. But looks like they have no effect. Answer: November 2014: If the expansion joint does not seem to be flexing enough, review the Flexible Joint Stiffness values by opening the Dialog or Flexible Joint Input grid tab: In some cases, the flexible joint stiffness settings were found to be all Rigid (as seen above) . If a flexible joint has all stiffnesses set to Rigid, this would be the same as a piece of rigid pipe and will offer no flexibility. Suggest modifying the stiffness values as outlined by the Flexible Joint Manufacture. If the flexible joint is entered as specified by the manufacture and still exceeds a nozzle allowable, suggest to perform a through review of the loads on the flexible joint to better understand why the forces / loads being transmitted are so high. Also, remember when using a flexible joint there is a pressure thrust component related to the Pressure Are specified on the Flexible joint. Suggest contacting the Flexible Joint manufacture for assistance in designing a suitable flexible joint for your application. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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