Hi,
I started learning AutoPipe about a week ago. I am trying to model and set up the analysis for a piping system (reference pages attached from "Applying the ASME Codes Plant Piping & Pressure Vessels" textbook, by James. A Wingate).
I started modeling the geometry at Node A00 (Node 5 in the example problem in the book), but what I have modeled does not look OK.
I am not sure on how to model the following elements : H/X 10" flange connection, the 10"x12" reducer, the reducer attached flange and the flanged 30" strainer.
Shall I define the 10" H/X flange connection on a 10" segment and then the 10"x12" reducer on a 12" segment?
I have included here a copy of the pages from the above mentioned book. I would appreciate any suggestions and tips on how to properly model these elements.
Regards,
Bogdan ChivulescuPDF
Hi Bogdan,
As we have already discussed, here is the response to your questions.
Flanges are single point components with no length, but take into account the flange weight and the SIF of the welded connection. The link below has more information, including a recommended method to model a flange and include the hub length. https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/8398/b-flanges-piping-components-modeling-approaches-tips-techniques-used-in-autopipe
The component from A00 to A05 in the model looks like it was inserted as a run. If it needs to be a reducer, it needs to be inserted as a reducer and then a new Pipe Identifier has to be defined for the new 10” pipe.
Here is a link to help define the strainer.
https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/28859/n-how-to-model-a-strainer-filter-in-autopipe
Hello Bogdan,
In addition to Jessica's comments above, please see the attached AutoPIPE CONNECT v.11.01.00.23 model.
There was insufficient information to model this example. There is no information on:
1. The length of the valve at Node 60. I guessed.
2. Piping Code year to be used. Assumed 2016.
3. Of insulation density used, assumed 11 lbs/ft3.
4. AutoPIPE uses seamless pipe for all library data, use pipe properties long e weld factor to account for long welded pipe.
5. Not clear if Hot Allowable etc should be 20ksi or 17ksi.
6. etc..
Do not use this model in production unless you have completely reviewed and found it to be correct.
Mike DattilioBentley Product Advantage Group AnalystAutoPIPE Product Line Bentley Systems, Inc.FIG 3-1 Piping Stress Analysis Isometric Sketch_Archive.zip
A common reason for releasing the anchor might be because the piping is attached to equipment near where the spring hanger is located, and the user might prefer to have the spring hanger take more of the weight of the piping system than than the nozzle connection to the equipment. This is further explained in the help section: Help > Contents> Contents Tab> Modeling Approaches> Anchors> Modeling Approaches> Anchor Releases For Hanger Selection. The anchor release is optional because it would only be used in specific situations, like the one mentioned above.
For some applications it is preferred to use a Cold Load approach. The idea of the Cold Preload is that as the spring goes from the cold to the hot condition, it is balanced in the hot operational state. It provides for more balanced loading on equipment during installation in systems involving hot gas piping around pumps, or gas piping around compressors or steam piping around turbines. In this case the load calculated in the Gravity case is taken as the cold load. The calculated Hot load is then less and the load variation calculation also changes. This AutoPIPE Wiki has more information and an example.
Thanks,
Jessica Alegre