Reinforcing pad crosses over the longitudinal seam
Reinforcing pad crosses over the longitudinal seam
(OP)
Dear All
I am design ASME U stamp vessel.
I wanted if weld on weld is premitted in ASME, i.e. longitudinal seam is run over by reinforcing pad weld.
Ideally I am trying to do 100% radiography before aand aafter weld. I cannot find in ASME code if it is allowed?
Any views greatly appreciated.
I am design ASME U stamp vessel.
I wanted if weld on weld is premitted in ASME, i.e. longitudinal seam is run over by reinforcing pad weld.
Ideally I am trying to do 100% radiography before aand aafter weld. I cannot find in ASME code if it is allowed?
Any views greatly appreciated.





RE: Reinforcing pad crosses over the longitudinal seam
See UG-82
RE: Reinforcing pad crosses over the longitudinal seam
One more thing, if you must cross the pad's fillet weld over the shell long seam, try to design the pad so the welds crossing angle is as close to 90 deg as possible.
cheers,
gr2vessels
RE: Reinforcing pad crosses over the longitudinal seam
The minimum distance between the edge of any attachment weld of a pressure part (nozzle, reinforcing plate) to the edge of a another pressure weld of the vessel shall at least be 50 mm or twice the thickness of the pressure part, whichever is the greater.
If this is not possible the attachment weld should cross the pressure weld completely by a length of at least 50 mm or twice the wall thickness (whichever is the greater) in order to avoid any stress concentration.
Before the attachment weld is made, 100% NDE should be performed in accordance with code requirements (ASME VIII = UW-11) on the pressure weld in the area where the attachment weld will cross.
RE: Reinforcing pad crosses over the longitudinal seam
UW-15(d) was redesignated to UG-37(g) in the 2004 Edition, 2005 Addenda; but this was not reflected in the 2007 Edition. You could send a request for revision on UW-46, i.e. change the last sentence in brackets to read as "[For tests on reinforcing plates, see UG-37(g)]"
RE: Reinforcing pad crosses over the longitudinal seam
cheers,
gr2vessels
RE: Reinforcing pad crosses over the longitudinal seam
I really appreaciate ur help. It helped me to make descicion congfidentalaly.