Page 333 - Trenchless Technology Piping Installation and Inspection

292 Cha pte r Se v e n

FIGURE 7.6 Hot water curing. (Source: Insituform Technologies.)

properly inflated with air, the resin is cured using steam. Typically
the CIPP components (such as tube material and resin) must be an
integrated system specially designed for steam curing.
The third method is UV light curing. First, a fiberglass liner is
pulled and inflated into the existing pipe. Then a CCTV camera with
the UV light apparatus is inserted in one end and pulled to the oppo-
site end recording the precure condition of the liner. The UV light
apparatus is then pulled back to cure the liner, at a regulated speed,
with the CCTV camera recording the curing process.

7.5 Inspecting CIPP Installation
A variety of project and site conditions can exist during the CIPP
installations. Conditions can vary from wet to dry and from hot to
cold environments. The inspector must document site and existing
pipe conditions and make sure that the CIPP is installed according to
the contract and specifications.
The inspector must become thoroughly familiar with the con-
tract documents for the project and most importantly the technical
specifications. The technical specifications will guide the inspector
about inspection areas, documentation requirements, test samples
(identification, type, number of test samples required, location,
maintenance and delivery, testing agency, documentation, and so
on), to ensure that the CIPP is installed with specified quality. The
specifications determine degree of inspection a specific project
requires. Table 7.7 presents the various actions to be taken by the
inspector on various operations before, during, and after installa-
tion of CIPP.