Need to Weld Together 2 Pieces of Piping
Need to Weld Together 2 Pieces of Piping
(OP)
Hi,
I'm working on a project where the customer doesn't want any NPT connections at all so I have to change over all of my adapters to one piece units.
So before I had a 6'' 600# raised face (RF) flange tapped to 3'' NPT, in that I put a 3'' NPT nipple, and on the nipple I put a 3'' hammer union adapter. Now I'm getting a 6inch to 3 inch, RF, weld neck, standard reducing flange made of A105N. But the weld neck hammer unions adapters I have have an XXH wall thickness. Is it not possible to butt weld the 6x3 600# reducing flange I have to the XXH hammer union adapters because the wall thicknesses are different? Also, I have a welding company in place to weld together my pieces, but what information do they need from me to weld them together.
Thanks!
Hammer Union Hard Pipe
https://www.google.ca/search?q=hammer+union&es...
I'm working on a project where the customer doesn't want any NPT connections at all so I have to change over all of my adapters to one piece units.
So before I had a 6'' 600# raised face (RF) flange tapped to 3'' NPT, in that I put a 3'' NPT nipple, and on the nipple I put a 3'' hammer union adapter. Now I'm getting a 6inch to 3 inch, RF, weld neck, standard reducing flange made of A105N. But the weld neck hammer unions adapters I have have an XXH wall thickness. Is it not possible to butt weld the 6x3 600# reducing flange I have to the XXH hammer union adapters because the wall thicknesses are different? Also, I have a welding company in place to weld together my pieces, but what information do they need from me to weld them together.
Thanks!
Hammer Union Hard Pipe
https://www.google.ca/search?q=hammer+union&es...





RE: Need to Weld Together 2 Pieces of Piping
Welding ends should not differ in thickness by more than 3/16", or you will need to put a short pipe with an intermediate wall thickness in between. The pipe can be taper bored if necessary.
They will need the welding design code reference, such as B31.4 or B31.8 with API 1104, or ASME BVP for example. Check your piping design code to see what welding design specs are referenced.
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RE: Need to Weld Together 2 Pieces of Piping
RE: Need to Weld Together 2 Pieces of Piping
Sorry, but I have a hard time thinking (or not thinking) in 1/32"s.
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RE: Need to Weld Together 2 Pieces of Piping
XXH to XXH it is then. Thanks.
RE: Need to Weld Together 2 Pieces of Piping
Just counterbore the XXH to match the other piece, and make sure that the machinist a) keeps the transition area far enough back from the weld cap that when X-rayed, it will not look like a weld 'feature'; and b) has a 3:1 or shallower taper in the transition area; and c) allows at least a small radius at the 'root' of the taper to avoide a stress concentration at the start of the taper.
RE: Need to Weld Together 2 Pieces of Piping
RE: Need to Weld Together 2 Pieces of Piping
RE: Need to Weld Together 2 Pieces of Piping
And remember it is 3/32. it is 3/32. it is 3/32. it is 3/32.
That should help me remember too.
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