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Construction and Inspection for Cur ed-in-Place Pipe     297


     7.7  Quality Assurance and Testing


          7.7.1  CIPP Inspection and Acceptance
          The CIPP installation may be inspected visually if appropriate. Addi-
          tionally, CCTV is commonly used for pre- and postinstallation inspec-
          tion purposes. Variations from true line and grade may be inherent
          with CIPP because of the conditions of the existing pipe. However,
          certain conditions must be met, such as the new CIPP should not
          show any infiltration of groundwater. At the conclusion of the instal-
          lation, all service connections must be accounted for and reconnected.
          Table 7.8 presents sample defect codes for CIPP lining evaluation.
          7.7.2 Workmanship
          The CIPP should be continuous over the entire length of an installa-
          tion and be free of dry spots, lifts, and delaminations. If these condi-
          tions are present, the CIPP will be evaluated for its functionality to
          meet the applicable requirements of the contract documents. If the
          CIPP does not meet the requirements of the contract documents or the
          functions expected based on the technical specifications, the affected
          portions of CIPP may have to be repaired according to the contract
          provisions. Some project owners may apply a penalty in addition to
          the CIPP repair and/or replacement requirements (see following sec-
          tions). See Sec. 2.8 for sample CIPP technical specifications.

          7.7.3  Quality Control Issues

          Design Issues
          The key design consideration in CIPP liner installation is the ability of
          the cured-in-place pipe to withstand buckling due to ground water


           Defects             Codes    Defects              Codes
           Lining shrinkage    LS       Lining bubbles       LB
           Lining wrinkles     LW       Lining fins or folds  LF
           Foreign inclusions  FI       Lining delamination  LD
           Lining cracks       LC       Hot dogs             HD
           Dry spots           DS       Mis-cuts             MC
           Lining wrinkles     LW       Annular space        AS
           Lining elongation   LE       Lining thickness     LT
           Lining dimples      LD       Lining lumps         LL
           Under-cuts          UC       Overcuts             OC
          TABLE 7.8  Sample Defect Codes for Pipeline Lining Evaluation
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