Does joining a 2 1/2" standpipe to the 6" main pipe through drilling the main pipe and welding the standpipe to it in the T form- instead of using any fittings- comply with NFPA 14?
The method of union by welding is allowed by NFPA 14 in its chapter number 4, since the method of union by threads is not allowed for pipes with diameters greater than 2 ".
Thank You! yonathanfranco
But I mean is it permissible to weld a standpipe to the main pipe without any fittings (such as an union)?
Typically a weld-o-let is used, which accomplishes the same thing, by connecting both to the main pipe and to the branch line.
Yes it is allowed, as long as the pipes to be joined are of the same wall thickness (schdule), in section 4.4 of NFPA 14 it indicates that pipes can be joined by welding (ie without threaded fittings, grooved, among others).
based on paragraph 104.3.1 (D), ASME B31.1 standard, " Reinforcement is required when it is not provided inherently in the components of the branch connection."
Does it apply to fire fighting pipes?
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