Aditya,
This is a "regular post", not a "poll". In the future, please use the [New Topic] button instead of [Post a Poll].
I presume by "circular pipe" you mean a "ring header"? If so, go to the CAESAR II download page and acquire the file "jzink.zip". This is an example of how to model a ring header.
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Regards,
Richard Ay - Consultant