ASME PCC-2 Post Construction Welding Specifications Overview Episode 1 (Introduction & Weld Repair)

Introduction to PCC Specifications

Overview of Athabasca Engineering Solutions (AES)

• Chris Kurzick introduces himself as the principal engineer at Athabasca Engineering Solutions (AES), which specializes in third-party value evaluations, training and certification, and equipment re-rating.

Understanding ASME PCC Specifications

• The American Society of Mechanical Engineers (ASME) has post-construction specifications known as PCC, distinct from construction specifications like B31.3 and B31.4.

• There are three main PCC specifications:

• PCC1: Pressure boundary bolted flange joint assemblies.

• PCC2: Repair of pressure equipment and piping.

• PCC3: Inspection planning using risk-based methods.

Deep Dive into PCC2

Scope and Organization

• PCC2 focuses on the repair of equipment, including piping, pipelines, and ancillary equipment after they have been placed into service; it emphasizes post-construction repairs.

• It outlines relevant design, fabrication, examination practices for maintenance engineers to follow when conducting temporary or permanent repairs based on inspection findings.

Exclusions from Scope

• The specification does not cover inspection and flaw evaluation methods; references include API standards such as:

• API 510 for vessels,

• API 570 for piping,

• API 1169 for pipelines,

• API 653 for tanks.

Weld Repairs in PCC2

Article Summaries

• Article summaries begin with Article 201 concerning butt welded insert plates used in pressure components to address flaws through symmetrical welding techniques.

• Article 202 discusses external weld build-up to repair internal thinning caused by erosion or corrosion while the system is operational.

Seal Welded Connections

• Article 203 covers seal welded threaded connections where threads maintain mechanical strength while welds ensure leak tightness—critical in high-pressure or toxic fluid applications.

Common Maintenance Procedures

Leak Box Repair Techniques

Repairing and Reinforcing Components in Engineering

Purpose of Repairs

• The primary goal is to repair leaking components or reinforce damaged structural elements, often involving flanges, valves, fittings, branches, vents, and drains that may crack or leak without the option for unit shutdown.

Custom Parts Utilization

• Custom parts such as split pipes, pipe caps, or plates are used for repairs when replacement isn't feasible or economical. More detailed procedures can be found in Article 204.

Weld Ring Gaskets

• Article 205 discusses weld ring gaskets used in high-pressure units. The process involves welding individual rings to their designated spots before connecting them together.

• Different styles of weld ring gaskets exist; the choice often depends on temperature conditions. These gaskets are preferred when conventional options aren't suitable due to pressure concerns.

Full Encirclement Reinforcement Sleeves

• Article 206 covers full encirclement reinforcement sleeves for piping applications aimed at addressing leakage or structural integrity issues through welding techniques.

Fill-It Welded Patches with Reinforcing Plugs

• Article 207 focuses on fill-it welded patches with reinforcing plugs primarily used in liner systems where overlays may be impractical due to time constraints or confined spaces.

• Installation requires careful fitting of repair plates into existing components while considering potential warping; modern scanning and grinding techniques assist this process.

Conclusion and Further Assistance