How can you account for movements within pipe-to-fitting thread engagement? Movements in the threading can occur axially and rotationally at varying load applications.
Autopipe does not seem to have an input for fittings or connections that accounts for thread engagement behavior.
Greetings,
Please discuss with Eric MacFarlane.
Regards, Mike Dattilio Design Analysis Engineering Group Senior Analyst Bentley Systems Inc=============================================================================
When sharing an AutoPIPE model with a user that does not have access to the same folder location where the model is stored, one should always send an AutoPIPE APC file. Highly suggest to not send an DAT file.
You are correct that there is no Flexibility factor for a Tee fitting. I had a look at the dat file provided, however you failed to provide detailed information on exactly what is the observed concern. You claim to have test data that shows fittings moving axially and rotationally due to applied loads. Where is the test data for this size pipe, with this piping arrangement, and this GR loading? What are the expectations?
I can see that the applied load at the end of the pipe is causing the Tee node point (A03) to displace vertically down -0.00015726518 inches.
Are you expecting to see more or less move movement at this location ?
There is nothing in this model to indicate that A03 would experience a torque about the axis direction of the pipe (along the header direction of the tee). If your test data indicates this phenomenon then you can manually apply a concentrated force at the fitting node point(s) with the direction and magnitude as needed. Suggest that the concentrated force(s) be applied to the GR load case.
If the issue is related to the pipe twisting because of this arrangement and loading configuration, please share some insight as to what is causing this twisting, share your test set up, and the observed results.
Hold on, I need to back up here and start over.
You claim to have test data that shows fittings moving axially and rotationally due to applied loads. I cannot see how you are modeling your fittings in AutoPIPE. Are you modeling fittings using the adjacent piping Pipe Id, or other?
Regardless, AutoPIPE will consider the geometry and material settings of the PIPE ID specified across 2 adjacent node points. Unless you modeled the fittings with rigid properties, the length of a tee’s legs and full arc of an elbows are considered when applying all loading conditions.
You may consider inserting new PIPE ID as needed to correctly model fittings geometry and material properties. Be sure to apply the correct PIPE ID across the model. Recommend using AutoPIPE’s Pipe Identifier (Show > Properties > Pipe Properties > Pipe Identifier) command to clearly see.
As mentioned above, to help refine the model, you can manually change a bend's flexibility factor or newly suggest modifying the respective PIPE ID as needed.
If you have any further comments, please provide a simple detailed example of some piping geometry, PIPE ID data, and movement seen in AutoPIPE compared to your test data.
We can do this for elbow (bend) fittings; however, there does not appear to be a flexibility factor input for 'T' fittings. Is there a way to put in a flexibility factor in 'T' fittings?
Also, this tested flexibility factor will most likely vary on a case-by-case basis so I am unsure of how we could apply it across a whole pipe system at this time.