Thread Branch Connection for B31.3 Piping
Thread Branch Connection for B31.3 Piping
(OP)
Just wondering if anyone is aware of a clause in B31.3 that specifically disallows the use of threaded branch connections. I've had a read through and I can't find a specific paragraph that explicitly disallows it though my instincts say that threaded branch connections should not be permitted.
Any thoughts on this subject would be most appreciated.
Any thoughts on this subject would be most appreciated.





RE: Thread Branch Connection for B31.3 Piping
Be aware that some people (properly in my view) distinguish between a piping branch and an instrument branch. Piping can put a lot more stress on such a branch than you'd get from installing a pressure gauge, as an example.
RE: Thread Branch Connection for B31.3 Piping
RE: Thread Branch Connection for B31.3 Piping
RE: Thread Branch Connection for B31.3 Piping
1) fittings (i.e. tees),
2) unlisted fittings under 3" attached by welding, or
3) welded stub-in connections
Sorry, but drilling/tapping the wall isn't permitted even in Category D services (ie. nonhazardous fluids), unless those services are exempted from compliance with the code in your jurisdiction. An example would be potable water (which may be subject to other codes), or in some jurisdictions, air piping 3/4" NPS and smaller attached entirely by means other than welding.
RE: Thread Branch Connection for B31.3 Piping