What are the criteria to select Stub in or Stub on for Branch connection in Piping?

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PK M

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Nov 29, 2012, 4:47:19 AM11/29/12
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Dear Experts,

What are the criteria to select Stub in or Stub on for Branch connection in Piping?

(Or)

How to choose Stub in or Stub on for Branch connection in Piping?


Thanks,

Pkm..

Sudhir Kumar

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Nov 29, 2012, 2:43:39 PM11/29/12
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Selection of joint design is based on the stress at the opening (design calculations) by Design Engineer.
 
Regards
Sudhir kumar

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Samir Mehta

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Nov 29, 2012, 6:53:42 AM11/29/12
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the branch connection for the header with re-pad should be stub-out. The header that does not have re-pad should be stub-in.

Regards
samir

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Samir Mehta
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JPIOS
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Ammar Shaikh

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Dec 1, 2012, 12:48:45 AM12/1/12
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Some OEMs see insertion of branch pipe in main pipe as obstruction in flow and prevent from this type of joint orientation. They say it will not ensure proper flow in the branch pipe. Fluid inside pipes is also considered as a factor.   
Stub out connections result in fillet welds while stub in result in butt weld
 
Ammar
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