Coupling welded directly on an elbow

[Dexter86]

Good Morning All,
I have a doubt and I kindly ask you to help me to solve it.
Do you know if ASME standards allow to weld a coupling directly on a elbow (like if it was an elbolet for instance)?
I have not found any rule or guideline about it.

I attach a picture fore completeness.

Thank you in advance

 

[1503-44]

There's millions of those all over the place. No issues that I know about.

 

[LittleInch]

Nothing wrong with that.

In piping design terms an elbow is the same as a piece of pipe, just that it's not straight, so the same reinforcement rules apply.

If you look at the B31.3 code it allows for branches to be at an angle to the pipe. Same thing here.

Put that branch with forces though and there could be an interesting stress concentration at the crotch, but that's what FEA is for ;-)



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

 

[Dexter86]

Thank you guys!
LittleInch I have checked at the B31.3 again and of course, it allows branches pipe-to-pipe.
I have also found the picture titled "Acceptable details for branch attachments Welds" that shows the weld dimensions to be considered.
I think that those are the only guidelines to be follow since I did not find anything else, right?

Thank you in advance

 

[LittleInch]

You could just buy an elbowlet or similar....

https://bonneyforge.com/products.php?pg=branch&subpg=elbolet

scan down a bit for a diagram

http://www.vishaltube.net/alloy-steel-elbolet-olets.html

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

 

[0707]

yes there lots of stuff done that way

luis

 

[Dexter86]

Thank you guys!

Have a nice day!

 

[Latexman]

That's one of the preferred ways to measure temperature in a pipe. The swirling in an elbow usually gives a better mixed, more steady, consistant temperature measurement. Less variation.

Good Luck,
Latexman

 

[gsakamoto]

Very common.

 

[KernOily]

Very common... as long as your pipe spec permits it. Some owners' specs don't permit the use of elbolets.

You didn't say what size. If the elbolet is large enough and there could be significant forces and moments at the attaching weld, make sure you run a stress model.

 

[gsakamoto]

Thanks KernOily, you are correct. I assumed that this was a small olet (1/2" - 1-1/2") and the main run elbow diameter was NPS4 or greater.