You are currently reviewing an older revision of this page.
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.
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
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.
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.
Bentley AutoPIPE
Bentley Technical Support KnowledgeBase
Bentley LEARN Server
Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article tothe "Comments" area below. THANK YOU!