Page 355 - Trenchless Technology Piping Installation and Inspection

No deduction, assuming a proper seal is achieved at each end and lateral. If contractor chooses not to dig and replace, a deduction can be applied for the

N/A reach.† N/A

Tape should be removed to prevent potential flow blockage. If leaking 1. between the existing pipe and the CIPP, inject a hydrophilic type grout to stop the leakage. If no leakage, 2. a cementitious grout can be used to fill the space. In groundwater situations install a hydrophili

Should be repaired

N/A if leaking N/A

N/A N/A N/A ∗ Wrinkles/fins/folds are diameter dependent, for example, 1/4-in. is a small wrinkle especially in medium and large CIPP. † Contractors may choose to offer a deduction if the product does not meet the specification and is not acceptable to owner.

Seam tape inadequately bonded during manufacture. Insufficient pressure 1. to fully expand the liner. The end of the liner 2. was not pulled sufficiently into the manhole for full expansion at the manhole face. A factor of existing 3. pipe geometry. Small gap between liner and existing

Seam tape, loose, blistered or leaking Annular space between existing pipe and liner at manhole/ annular space (AS) Ground water leakage between the liner and existing pipe at the manhole Adapted from NASSCO TABLE 7.10

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