CAN THIS BE WELDED THIS WAY 1

[imagineers]

So I am designing a manifold out of 1" stainless pipe. the ID is around 1.0979"= 27mm, now I want to add a branch off this not a coupling, but anotehr piece of the same size pipe. My question is whats the best way to join them. I am not sure if I would make a large hole in the long pipe and try to push the shorter pipe into the longer one of cut out a groove on the smaller one as you can see in pic and then weld around. operating pressure around 5psi, up to 30psi. Also how would you cut that groove around the pipe if thats the best option??

 

[21121956]

Hello everybody:

I would perform the welding as it is shown in the scheme in the middle.

Attached, information regarding with the procedure.

El que no puede andar, se sienta.

 

[imagineers]

wouldnt the bottom pipe get weak if you cut that deep of a groove into the pipe

 

[metengr]

Why don't you purchase a Tee of the same pipe size and schedule and make only circumferential butt welds joining the Tee to the spools. This is typical for manifold construction.

 

[imagineers]

I don't have the rom, what I am joining into is only a couple inches below that longer pipe, no room to have a Tee then another pipe

 

[metengr]

In that case, I would use the stub in branch as a Tee connection and check what reinforcement is needed on the branch using B31.3 code.

 

[Duwe6]

Left & right representations are preferred by ASME, but both require full-penn welds. If you use the middle detail "birdsmouth cut" and do not achieve full penn and a fairly smooth root, you have generated a major stress-riser in an unreinforced area. Anticipate spectacular failures.

 

[imagineers]

thanks

 

[tbuelna]

If the sketch provided is accurate, the butt-weld pipe fitting shown below should work just fine.

 

[imagineers]

Thanks everyone