Ground flushed longitudinal welds overlapped by external reinf. rings
Ground flushed longitudinal welds overlapped by external reinf. rings
(OP)
I have the following situation:
We have ordered a vessel to an italian manufacturer which during the manufacturing DID NOT GROUND FLUSHED the longitudinal welds before welding over them the reinforcing rings and some plates for platforms fixing.
I told them that this is not acceptable so they proposed me
to accept the situation considering that "we have done on internal side, after flush-grinding of barrel's longitudinal welding, Ultrasonic Test the interested area and no defects have been found".
Please I need a very strong support (something from ASME 8 or 9) in order to accept or reject their proposal. Any advise is welcome.
Thank you very much.
We have ordered a vessel to an italian manufacturer which during the manufacturing DID NOT GROUND FLUSHED the longitudinal welds before welding over them the reinforcing rings and some plates for platforms fixing.
I told them that this is not acceptable so they proposed me
to accept the situation considering that "we have done on internal side, after flush-grinding of barrel's longitudinal welding, Ultrasonic Test the interested area and no defects have been found".
Please I need a very strong support (something from ASME 8 or 9) in order to accept or reject their proposal. Any advise is welcome.
Thank you very much.





RE: Ground flushed longitudinal welds overlapped by external reinf. rings
look specifically at ASME VIII, Div 1 clause UG-82 - grinding flush is required.
John
RE: Ground flushed longitudinal welds overlapped by external reinf. rings
VIII-1-89-113,VIII-1-89-174.
What does the AI say?
RE: Ground flushed longitudinal welds overlapped by external reinf. rings
WBH
RE: Ground flushed longitudinal welds overlapped by external reinf. rings
Second option: Cut (By grinding) the central portion of the covering pad plate, leaving 10 to 15 mm on all the sides on the shell itself and then provide a box type cleat back plate and weld it so that the arc does not strike the vessel wall. Leave a Notched portion the web plate near the area where the longseam coincides so that there is no weld over the weld. Here you do not have to flush grind since the top plate clears the shell.
Third option: Split the pad plate so that long seam is uncovered, this may be sufficient for external piping or platform cleat (under normal circumstances for an external support cleat, unless it is a reboiler support local load analysis is not required). Your Ai may not object to this.
Good Luck
RE: Ground flushed longitudinal welds overlapped by external reinf. rings
Option 3 apperars to be OK. Other options are a bit too radical.