Page 325 - Trenchless Technology Piping Installation and Inspection

Most surface damage will not prevent the proper installation of
Typically, a preliner is installed first. Then the CIPP is installed

soils should be evaluated. inside the preliner. Grouting and stabilizing the surrounding A CIPP liner can be installed, but will significantly wrinkle through the undersized pipe section. The better alternative is to replace the undersized pipe with the correct size and then install the CIPP. A CIPP

CIPP. Operational and Maintenance Defects (see Fig. 7.2)

Surface damage can appear in a number of ways. The surface can be rough, it can have aggregate missing or projecting, steel reinforcement visible and projecting, and more. A section of pipe is missing with only the dirt left in place. An area of the existing pipeline system that was previously excavated and re

Pipe surface damage Missing pipe sections Previous point repairs Brick pipe defects Deposits & tuberculation Tree roots Infiltration/ inflow (I & I) Obstructions in the pipe TABLE 7.5

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