| Standard | Title | Relevance to Patching | |----------|-------|------------------------| | | Repair of Pressure Equipment and Piping | Primary standard for engineered patches, including full-encirclement and lap patches. | | ASME Boiler & Pressure Vessel Code (BPVC) Section VIII | Rules for Construction of Pressure Vessels | Used for reference when calculating required patch thickness. | | ASME BPVC Section IX | Welding and Brazing Qualifications | Mandatory for qualifying welding procedures for patch installation. | | ASME PCC-1 | Guidelines for Pressure Boundary Bolted Flange Joint Assembly | Relevant when patching near flanged connections. |
All joints must be executed by qualified welders using procedures (WPS) compliant with ASME Section IX
The heart of ASME PCC-2 for patching is , "Fillet Welded Surface Patches." It details the selection criteria, application limits, design, fabrication, examination, and testing of fillet welded patches applied to the inside or outside surface of a component.
While initial manufacturing falls under construction codes like (pressure vessels) or ASME B31.3 (process piping), in-service patch modifications rely heavily on the technical provisions of ASME PCC-2 (Repair of Pressure Equipment and Piping) alongside jurisdictional codes like the National Board Inspection Code (NBIC) Part 3 . The Legal Framework: Standard vs. Code asme standard patched
Defective metal is completely excavated until sound base metal is reached. A replacement plate (insert) is cut and rolled to match the curvature of the shell. Welding: Joined using a full-penetration groove weld .
In the context of the ASME Boiler and Pressure Vessel Code (BPVC) Piping Codes (B31)
Without these steps, a repair is merely a "temporary patch"—not an ASME standard patched repair. | Standard | Title | Relevance to Patching
| Code Section | Feature | |--------------|---------| | ASME VIII-1 UG-37 | Area reinforcement requirements | | ASME VIII-1 UG-41 | Strength of reinforcement welds | | ASME PCC-2 Article 201 | Permanent patch repair for corrosion/erosion | | ASME VIII-1 UW-13 | Welded attachment details |
: Provides the design rules for openings and reinforcements. If a "wrong opening" occurs during fabrication, any repair (patching) must be approved by an Authorized Inspector (AI) and must meet the original Code of Construction. Welding Qualifications : All patch welding must conform to ASME Section IX
: This is the primary standard for text appearance. It mandates that all lettering be legible and suitable for reproduction. | | ASME PCC-1 | Guidelines for Pressure
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).
For more permanent solutions, ASME PCC-2 Article 201 details butt-welded insert plates , which involve replacing the damaged section entirely rather than just covering it.