Dear,
Good Day!
I am new for Pipeline stress analysis.
I met a problem with 24 inche line bend radius as 1700D, after buried the pipe, Although bend angle elements are 0.10 degree, but CAESAR-II shows the error and not meet out the minimum bend radius as 0.10 degree.

how to rectify this problem? if I increase the bend angle degree the pipeline routing will get change, if I decrease the bend radius from 1700D to 1550D then there won't be error, but that is not real case.

Please reply. How to carry out this calculation to run without error and actual.

Change the minimum allowed bend angle in the Configuration (on the Geometry pane).

Dear Ay,

Thanks for your reply.

I have already changed in the configuration set up file regard the bend angle.

Still error message is showning that "Bend angle on element xxx TO xxx is 0.10 Deg; It must be between 0.10 and 135.0 Deg."

what would be the reason? how to correct it?

your reply will be highly appriciated

Change the configuration to 0.09 degrees.

Dear Jernas,

Model it like a elastic bend instead of cold field bend. And for best result use a deflection for every 12metres.

Regards,
PCJ

Check your SIF and k for such a large radius. It's just the same as straight pipe, isn't it.
You can build your "bend" with a (large) group of short straights using the duplicate and rotate command - duplicating more and more larger arcs each time. No need to call them bends.

Dear Richard Ay,

I think, Editing the configuration files will not work.

Dear Dave Diehl,

Yes you are correct, but tedius work (total 162 Km run pipeline)

Thank you very much both of you!

Regards,
JJ Sam

Dear Richard / Dave Diehl,

Using 1550 D Elastic bend radius than 1700 D Elastic bend radius is more conservative. Do you agree with me?

I mean to say that in order to not accepting bend radius (0.09 degree) after buried the pipeline in CAESAR-II software. (because after buried the pipeline many small elements are split) can I reduce the elastic bend radius from 1700 D to 1550 D? so that even after buried the pipeline, the angle between the small elements will be minimum 0.1 degree so that CAESAR-II will accept to run the calculation.

but the stress result will be make any significant change, Am I correct?
Please reply me.

Thanks and regards,
JJ Sam

Bends are defined in the program to set the flexibility (k) and stress intensification (SIF) values for that component. With such a large "bend" radius, I believe your k=1 and your SIF=1. So, these need not be defined as bends.
Go ahead and build your big bends and "bury" them. But before you run the buried model, remove the bend definition for all these tiny "bend" angles. You can do this quickly by using the Bend List. Select a block of all these tiny bends and do a block delete.