Hello Greenlane, AutoPIPE models are analyzed based on center-line beams. Another words all piping is assumed to be a single element located at the center-line of the modeled geometry. It has been widely acceptable practice to model branch fittings as a single intersecting point (intersection of a header pipe and branch pipe). However, another method, as described in the aforementioned document, provides a closer approximation of the stress at the actual connection point where the brach piping connects to the header pipe. This type of modeling approach is also mentioned in ASME BPVC III -NB 2007, section "NB-3686.4: Welded Tee or Branch connection". If you are using method #2 from the aforementioned document, as mentioned "On “point 2”, B02, insert a User SIF." this would be the SIF value from the code, manufacture recommendation, or other FEA analysis. Just be sure that point A01 has an SIF setting = 1.0 . Behind the graphical features and element naming, a Nozzle element is a flexible joint. It is just that there is some automatic calculations performed to determine the stiffness values with a Nozzle element based on the dialog settings. Otherwise with a Flexible joint the user is responsible to entering all the stiffness values. Regardless of using a flexible joint or nozzle element, you will need to still insert an SIF value at point #2, B02. This modeling technique just takes into consideration the flexibility in the wall of the header piping. Regards, Mike Dattilio Bentley Technical Support Analyst Web: selectservices.bentley.com Create your Service Request online! Log in to SELECTservices Online via selectservices.bentley.com and then go to My Support Account Service Request Manager. You'll have the ability to create a new Service request, view all Service Requests created by you or anyone else in your company, and view statistics on previous requests.
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