Weld spacing- Nozzle to circ. seam
Weld spacing- Nozzle to circ. seam
(OP)
I'm looking for the minimum distance required between the edges of a vessel circumferential weld and a nozzle attachment weld per ASME VIII, Div.1
From UW-14, it would seem that there is no requirement for a nozzle of a size that is out of the scope of UG-36(c)(3). Per UW-14(a), any type of opening that meets the reinforcement requirements of UG-37 can be located "in" a welded joint, so does that mean also that adjacent welds could be as close together as desired (even if they do not overlap)? The only place that I could see a minimum spacing requirement was UW-14(d) which requires welds to be spaced 1/2" apart. But again, that refers only to openings meeting UG-36(c)(3), and it is for thicknesses up to 1.5" ... what if it is thicker?
The particular case I am dealing with is a 4" vessel wall thickness and a 24" diameter manway neck.
Any thoughts would be appreciated.
Thanks in advance,
Tom W
From UW-14, it would seem that there is no requirement for a nozzle of a size that is out of the scope of UG-36(c)(3). Per UW-14(a), any type of opening that meets the reinforcement requirements of UG-37 can be located "in" a welded joint, so does that mean also that adjacent welds could be as close together as desired (even if they do not overlap)? The only place that I could see a minimum spacing requirement was UW-14(d) which requires welds to be spaced 1/2" apart. But again, that refers only to openings meeting UG-36(c)(3), and it is for thicknesses up to 1.5" ... what if it is thicker?
The particular case I am dealing with is a 4" vessel wall thickness and a 24" diameter manway neck.
Any thoughts would be appreciated.
Thanks in advance,
Tom W





RE: Weld spacing- Nozzle to circ. seam
RE: Weld spacing- Nozzle to circ. seam
I remember a client's specification which demanded a distance of 50 mm between toes of adjscent welds. Sounds reasonable for your case.
RE: Weld spacing- Nozzle to circ. seam
Thanks again,
Tom W