Pipeline branching - Maximum Weldolet Size
Pipeline branching - Maximum Weldolet Size
(OP)
Hi everybody,
In one of the natural gas transportation project, Client does not allow using weldolet larger than 2" for branching. In other words he/she asked for pipe-to-pipe with reinforcing pad (saddle) for larger than 2" branches (header is 42"). What's behind this? Is there any code (or practical) requirement behind this?
Thanks in advance.
In one of the natural gas transportation project, Client does not allow using weldolet larger than 2" for branching. In other words he/she asked for pipe-to-pipe with reinforcing pad (saddle) for larger than 2" branches (header is 42"). What's behind this? Is there any code (or practical) requirement behind this?
Thanks in advance.





RE: Pipeline branching - Maximum Weldolet Size
Ignorance!
Sometimes its possible to do all the right things and still get bad results
RE: Pipeline branching - Maximum Weldolet Size
What's your opinion? For a 42" header, what would be the maximum size for weldolet branch?
RE: Pipeline branching - Maximum Weldolet Size
RE: Pipeline branching - Maximum Weldolet Size
Your question "For a 42" header, what would be the maximum size for weld-o-let branch? "
I suggest you contact Bonny Forge (http://www.bonneyforge.com/products.php?pg=branch&...) or WFI and ask them.
If they make it then it should be fit for use.
Sometimes its possible to do all the right things and still get bad results
RE: Pipeline branching - Maximum Weldolet Size
I suspect they have a specification that calls for branch reinforcement of the full encirclement type or something like that, and it might be ambiguous or silent on the smaller connection types.
RE: Pipeline branching - Maximum Weldolet Size
What I suspect is that at some point someone tried to weld some big weldolets in a large diameter thick header and bent it due to the heat input on one side. A pipe and reinforcement pad can be welded separately so can ease this issue.
This is one reason I don't like some Client specs. They have a bad experience somewhere,change the spec then no one will change it back...
Reducing and equal tees are probably better but you can't always do this.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline branching - Maximum Weldolet Size
Small diameter free to air blowdowns on high pressure gas lines rising up from buried pipelines, can be problematic because of high "jet thrust" loads and fatigue from oscillating load directions due to turbulence from exiting gas streams. IMO those should always be made with reducing tees and reducers where practical. The riser may need additional structural bracing as well.
RE: Pipeline branching - Maximum Weldolet Size