ASME PCC-2 Post Construction Specifications Overview - Episode 5 -Nonmetallic and Bonded Repairs

Overview of PCC 2 and Repair Procedures

Introduction to Athabasca Engineering Solutions

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

Review of PCC 2 Parts

• The episode reviews the structure of PCC 2, covering:

• Part One: Scope Organization Repair

• Part Two: Welded Repairs (16 articles)

• Part Three: Mechanical Repairs (13 articles)

• Part Four: Non-Metallic Bonded Repairs (3 articles)

High-Risk vs. Low-Risk Applications

• Discussion on high-risk design applications versus low-risk applications:

• High-risk designs require more engineering calculations and testing.

• Low-risk designs involve less stringent requirements.

Defining Low-Risk Conditions

• Criteria for classifying low-risk applications include:

• Pressure below 150 pounds.

• Temperature between greater than zero Fahrenheit and less than or equal to 120 Fahrenheit.

Repair Fluid System Components

Scope of Repair Procedures

• The scope includes piping, pipelines, tanks, and vessels with a focus on developing organized procedures for repairs that can be structural or pressure-related.

Example of Non-Metallic Bonded Repair

• An example is provided where fabric reinforcement is applied to worn-out supports due to significant loads from pipes.

Key Variables in Repair Systems

Fundamental Definitions for Repairs

• Key variables in repair systems include:

• Substrate preparation.

• Load transfer materials like fillers.

• Composite material repair laminates.

Procedure Development Considerations

• Not all elements need to be included in every procedure; however, understanding these variables is crucial for effective repair development.

Mandatory Parts of High-Risk Applications

Structure of High-Risk Application Procedures

• Mandatory parts include appendices detailing processes such as:

• Design sheets outlining necessary variables.

• Qualification data for the repair system including performance measurements.

Installer Qualifications

• Emphasis on installer qualifications similar to welding procedures ensures proper installation practices are followed.

Low-Risk Application Differences

Simplified Documentation Process

• Low-risk application procedures involve less documentation compared to high-risk ones while still requiring qualification validation for repairs.

Non-Metallic Internal Lining Techniques

Overview of Article on Spray Forms

• Focuses on non-metallic internal lining techniques using thermoset polymers specifically designed for buried pipes.

Protective vs. Structural Linings

• Distinction made between protective linings that safeguard surfaces and structural linings aimed at maintaining integrity against collapse.

Application Flexibility

Cured in Place Pipe (CIPP) Applications and Considerations

Overview of CIPP Application

• Cured in place pipe (CIPP) is a method used for repairing pipes, particularly effective for diameters greater than 24 inches.

• While ASME suggests challenges for applications under 24 inches, the speaker acknowledges that it is indeed more difficult but not impossible.

• The localized application of CIPP allows for quicker restoration of service, making it advantageous in urgent repair situations.

Design Considerations

• Reinforcement options such as fiber cloth impregnated with carbon can enhance the structural integrity of the CIPP system.

• Critical design parameters include minimum and maximum application temperatures, humidity levels, and exposure to harsh chemicals like acids or solvents.

Surface Preparation

• Proper surface cleanliness is essential; all debris must be removed to ensure adhesion.

• A suitable surface profile with adequate roughness is necessary for effective spray adherence.

Curing and Load Considerations

• The curing time before returning the unit to service must be carefully managed to avoid premature failure.

• ASME categorizes design loads into three types (A, B, and C), ranging from leakage concerns to structural integrity issues. Detailed procedures are outlined in Appendix 403.

Additional Factors Affecting Design