Use of tees
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Gentle masters! I have a question: for some small tubes that are welded to larger tubes by drilling holes in them, are there any specifications regarding the dimensions of these small tubes relative to those of the larger tubes? That is, what size can be welded directly, and what size requires a tee? For example, can a 15-inch pipe be directly welded to a 20-inch or 40-inch pipe?
It won’t work; even if you use a reduced-diameter tee, there will still be a limit on the maximum length of the thin tube. It’s pointless to connect it to a thicker tube anyway
Check the pressure pipeline grade table; the standards are listed there
Where can I find the pressure pipeline grade table?
A 15-inch pipe cannot be welded directly to a 20-inch pipe – it’s too thick. Generally, it does not exceed 50%. But this is related to design pressure, material, etc. It’s not that welding can be done arbitrarily; in practical engineering applications, one simply buys universal tees. What you mean by welding it directly on are usually small-diameter pipes such as the pipeline for taking samples from instruments, vent valves, drain valves, etc.