NGA 29/30 Repairing a Distribution Pipe Practice Test 2025 - Free Practice Questions and Study Guide

Encapsulation in pipeline repair refers to a method where a protective layer is applied to the pipe, often involving the cleaning and priming of joints before using a sealant that is applied under pressure. This process is essential for ensuring that the repaired areas are well-sealed and protected from further damage or leaks. Proper surface preparation, including cleaning and priming, is critical in achieving strong adhesion and longevity of the repair done with the sealant. Encapsulation thus creates a protective barrier that extends the life of the pipeline by helping to prevent corrosion and other environmental impacts.

The choice regarding applying a protective layer of paint does not capture the specific nature of encapsulation, which focuses on sealing joints rather than just surface coating. Installing a new pipe over an existing one might involve encapsulation indirectly but is not the definition of the process itself. Similarly, using epoxy to bond metal surfaces relates to adhesive bonding rather than encapsulation, which is more about sealing and protecting existing structures.