Q. Requirements for vessels with thickness?
The following additional requirements are applicable, as specified, to Carbon Steel and Low Alloy steel pressure vessels with main shell thicknesses greater than 50.8 mm:
- Prior to release from the supplier, all plate materials shall be Ultrasonically Examined (UT) in accordance with SA-435 or SA-578.
- The carbon content for Carbon Steel plates and forgings shall be limited to 0.30% max.
- All vessel connections shall be flanged.
- All nozzles shall be of the integrally forged, self-reinforcing type.
- Reinforcing pads for opening reinforcement are not permitted.
- Nozzle internal projections shall be flush with the contour of the vessel.
- 100% radiography (RT) shall be carried out on all category A, B, and C butt welds.
- Radiography shall be carried out after PWHT.
- 100% UT shall be carried out on all forgings over 75 mm in thickness.
- 100% UT shall be carried out on all category D welds.
- 100% Magnetic particle examination (MT) shall be carried out on all cut edges of pressure containing parts including all nozzle openings.
- 100% MT shall be carried out after PWHT on all areas from which temporary attachment welds have been removed.