Page 351 - Trenchless Technology Piping Installation and Inspection
P. 351
N/A N/A
The area where the existing liner has pinholes should be patched with a short-liner repair. As recommended by the manufacturer.
Should be repaired if leaking. All of the soft areas need to be cut out.
Pipe should have no visible leakage. A soft liner is not acceptable and needs to be reheated and hardened or cut out.
Defects in the coating caused during manufacture and/or installation. Liner may have been punctured during delivery and installation into the existing pipe. When pulling the robotic cutter through the lined pipe, if the cutter bit is extended, damage to the liner coating may occur. Cold spot
1. 2. 3. 1. 2. 3.
Pinholes, cuts, and leaks through coating Soft spot in liner TABLE 7.10
303
