Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
(OP)
I posted a similar thread in another forum, but have not received any responses, so I thought maybe this forum might get more results.
Using fig UW-13.2(c) as a reference, I have been under the impression that MPI or LPI requirements of UG-93(d)(3) would only be applicable to the thicker flat plate, not the abutting shell plate (ts). UG-93(d)(3) and UG-93(d)(4) refer to "the flat plate" numerous times, as though it was written for formed items being welded to a flat plate to form corner joint. However, in the case of a rectangular box, all the plates are flat...
For the top, bottom, and end plates (all ts of fig. UW-13.2(c)), which would not have exposed peripheral edges after welding, MPI or LPI could not be done after welding, but do the weld preparation areas of these flat plates require MPI or LPI?
Using fig UW-13.2(c) as a reference, I have been under the impression that MPI or LPI requirements of UG-93(d)(3) would only be applicable to the thicker flat plate, not the abutting shell plate (ts). UG-93(d)(3) and UG-93(d)(4) refer to "the flat plate" numerous times, as though it was written for formed items being welded to a flat plate to form corner joint. However, in the case of a rectangular box, all the plates are flat...
For the top, bottom, and end plates (all ts of fig. UW-13.2(c)), which would not have exposed peripheral edges after welding, MPI or LPI could not be done after welding, but do the weld preparation areas of these flat plates require MPI or LPI?





RE: Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
Interpretation:
VIII-1-07-57
Question: Are the NDE provisions of UG-93(d)(3) required if a forging is used for a flat head or cover?
Reply: No.
RE: Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
RE: Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
However, I understanding is the outside exposed edges of the flat after welding require MT or PT. This is per UG-93(d)(4)(-b).
UG-93(d)(4)(-a) requires the weld preparation in the flat plate before welding to be MT or PT examined.
Does UG-93(d)(4)(-a) apply to both plates in a corner joint if both plates are flat?
RE: Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes
All top/bottom plate to tube sheet and plug sheet are corner joints Fig UW-13.2(c) and the weld edges require MT or PT as per UG-93(d) before welding. Also peripheral edges of Tube sheet and plug sheet require MT/PT after welding
RE: Application of UG-93(d)(3) for Rectangular Pressure Vessels/Header Boxes