dbday
Mechanical
- Jan 10, 2009
- 84
Hi,
I have an ASME VIII Div 1 vessel where I need to place a pad for a support over a circumferential head to shell weld.
I understand that it is acceptable, with suitable radiography, to put openings across welded seams, and by inference, a reinforcing pad for said opening which would of course cover the welded seam, but does this thinking also extend to pads that need to be welded onto the vessel to attach lugs or supports.
Obviously covering a weld like this is not great design, but sometimes things can't be moved around and is it really that different to the situation presented by a reinforcing pad.
The pad would have a vent hole so that any leaks at pressure test would show up and radiography could be done before and after welding of the pad onto the vessel, post weld solution annealing could be done if necessary.
The material is super duplex (shell head at 10mm thick, pad at 6mm thick).
Any thoughts would be appreciated.
I have an ASME VIII Div 1 vessel where I need to place a pad for a support over a circumferential head to shell weld.
I understand that it is acceptable, with suitable radiography, to put openings across welded seams, and by inference, a reinforcing pad for said opening which would of course cover the welded seam, but does this thinking also extend to pads that need to be welded onto the vessel to attach lugs or supports.
Obviously covering a weld like this is not great design, but sometimes things can't be moved around and is it really that different to the situation presented by a reinforcing pad.
The pad would have a vent hole so that any leaks at pressure test would show up and radiography could be done before and after welding of the pad onto the vessel, post weld solution annealing could be done if necessary.
The material is super duplex (shell head at 10mm thick, pad at 6mm thick).
Any thoughts would be appreciated.