Welding a tee diectly unto a weldlet already welded to a run pipe

[Kobina1]

Hello Guys,

I would like some help.
Is it possible to weld a fitting, say an equal tee, to an already welded weldolet?

Can this be supported by ASME B31.3?

Thanks.

 

[TGS4]

Would you please attach a sketch to explain?

 

[LittleInch]

There is no direct issue with welding fitting to fitting. In other words you won't find anything in B 31.3 that says it is not permitted, because the code can't look at every possible design issue that could arise.

The stress analysis on the other hand might not like it.

It's a little unusual, but not sure what you mean by "already welded weldolet". do you mean one that has been welded to the pipe or do you mean one that had something welded to it which has now been cut off??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Kobina1]

Hello guys,

I apologise for the delay in responding.

Please allow me to clarify some more...

We have a weldolet on a header and we want to weld a tee directly on to the weldolet.
Unfortunately, we may not be able to do a stress analysis for the branch connection.

Please find attached a quick sketch to help with understanding. I apologise again for responding late.

Kobi.

 

[LittleInch]

Yes it can be done.

Just be careful with whatever load our force is on the branch as this will have a high bending moment on the weldolet, but providing it is reasonable then should be good

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[DekDee]

kobina1,
No problem at all with what you have shown.
My original thoughts were the same as LI (I think) - I envisaged the Tee turned 90 degrees and that would have created stress issues.
Regards,
DD

 

[TGS4]

I too don't have any issue with this, and the Code does not specifically prohibit such an arrangement.

Unfortunately, we may not be able to do a stress analysis for the branch connection.

Yes, you can in fact perform a stress analysis for the branch connection. If you choose not to, for reasons of cost or schedule (or whatever other reason you may have), you ought to note that in the design file, so that in the future when this develops problems due to excessive loading or vibration, the engineer performing the failure analysis won't waste time looking for a stress analysis that doesn't exist. BT;DT.

 

[Kobina1]

Thanks Guys,

I am really grateful for all your assistance.
I will certainly do as advised about the stress analysis.

Thanks again.

Kobi.

 

[jte]

If you choose not to, for reasons of cost or schedule (or whatever other reason you may have), you ought to note that in the design file, so that in the future when this develops problems due to excessive loading or vibration, the engineer performing the failure analysis won't waste time looking for a stress analysis that doesn't exist. BT;DT.

Now TGS4 - I would not have expected a guy of your caliber choosing to not evaluate the stresses at a connection, thereby leaving the engineer performing the failure analysis with a fruitless quest!

 

[TGS4]

jte - ha ha ha

I suppose that my been there done that should have clarified that I was the one on the fruitless search...