Texas Wastewater Class B Practice Exam

What is a common technique used to seal joint leaks on a main line with minimal service interruption?

1. External pipe wrapping

2. Internal grouting

3. Clamping

4. Aquaseal application

The correct answer is: Internal grouting

The technique of internal grouting is commonly employed to address joint leaks in a main line while minimizing service interruptions. This approach involves injecting a grout material into the interior of the pipe to fill voids and cracks, effectively sealing off leaks from the inside. By performing this operation internally, there is typically no need for extensive excavation or disruption of the surface above the pipeline, which is advantageous in maintaining service continuity for users connected to the main line. Other methods, while they may also be effective in sealing leaks, often require more invasive procedures or result in longer service interruptions. For instance, external pipe wrapping involves applying a material on the outside of the pipeline, which could necessitate the temporary shutdown of the service line or more significant disruption depending on the situation. Clamping offers a physical barrier to the leak but may not provide a permanent seal. Aquaseal application, typically used for surface sealing, might not penetrate deeply enough to effectively address joint leaks, potentially leading to recurring issues. Overall, internal grouting stands out as a preferred choice for its effectiveness and ability to limit disruption to services.