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mibagno (Mechanical) (OP)
1 Dec 10 6:14
Hello to everybody, this is a very simple question for people deeply knowing ASME B31.3, but it's not for me, since I'm a starter.
I have to make a pipe to pipe branch connection in a big pressure equipment designed to ASME B31.3. I have selected a pipe to pie connection due to the high design pressure, that could create big problems in Tee estrusion.
Please look at the attachment:
obviously "d" cannot be as big as "D".
Is there any paragraph of ASME B31.3 indicating maximum d/D dimension, or calculation method? I've found how to evaluate whether a reinforcement is needed or not, but I didn't find if there is any limitation on the ratio between main line and branch line diameter (in my case I have a main pipe API5L X60 dia 52" , to which I have to connect another pipe API5L X60. I have to identify maximum dimension I have to consider for the pipe to be connected to the main pipe 52"

Thanks to all the people helping me trying to close this issue!

Michele
Duwe6 (Industrial)
3 Dec 10 13:14
52" onto 52" is a tee.  

Branch connections have to be calculated for reinforcement requirements, just like a pressurevessel nozz.  I try to skip these calc's by using Integrally Reinforced Branch-Connection fittings --- Weld-O'lets.  No calc's required, easy to specify.

For fabricated pipe branch connestions, the usual limit is "no bigger than 2 pipesizes less than the header size".  For each diameter and wall thickness combination, you need to calculate the minimum required repad.  Tedious.  thus O'lets.

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