A critical legal nuance: If the original vessel had an on the nameplate, an ASME Standard Patched repair does not restore that "U" stamp status in the eyes of the National Board. The vessel becomes a "repaired vessel" tracked by the "R" stamp.
However, if the repair follows ASME PCC-2 strictly, most jurisdictions treat it as equivalent to new construction for legal operation, except in: asme standard patched
Rationale: Erratum identified during internal audit where corrosion rate units were inconsistent, potentially leading to underestimation of required thickness. A critical legal nuance: If the original vessel
An carries an official repair nameplate and an R-Stamp (for pressure vessels) or NR-Stamp (for nuclear). The repair organization must be an ASME-certified repair shop. Without this stamp, the patch is considered a "non-code repair," which voids the original ASME nameplate and may violate jurisdictional law (e.g., in most U.S. states, Canada, and EU countries). An carries an official repair nameplate and an
The most direct guidance for patching is found in . Although originally written for pipe repairs, its principles are widely applied to vessel shell patches.
Never allow a patch to be installed on an ASME-stamped vessel without a documented repair design per PCC-2, qualified welding procedures, and an ASME R-Stamp. That piece of paper is what separates a code-compliant patch from a pressure accident waiting to happen.