Which repair technique is considered best for addressing multiple joint leaks in a pipeline?

• A. Welding
• B. Cement lining
• C. Slip-lining
• D. Patch repair

Answer: (C)

When a pipeline has leaks along many joints, the repair goal is to restore a continuous, leak-tight flow path with minimal excavation. Slip-lining achieves this by pulling a new pipe inside the old one, creating a fresh, sealed liner along the entire length. This bypasses all the leaking joints in a single rehabilitation, restoring structural integrity and service quickly and with less digging.

Welding would address individual leaks at specific spots, which becomes impractical and risky when many joints are involved. Cement lining improves interior surface and corrosion resistance but doesn’t seal leaks at joints or restore the pipe’s full load-bearing capacity along a long run. Patch repair targets a single defect and would require numerous patches for multiple leaks, making it inefficient.

So, slip-lining is the best approach for addressing multiple joint leaks in a pipeline because it provides a continuous, new flow path and reduces disruption.