COOL-DOWN
The Contractor shall cool the hardened liner to a temperature below 100 degrees F
before relieving the pressure in the section. Cool-down may be accomplished by
the introduction of cool water or air into the lined pipe to replace water or steam
and water being drained. Water shall be drained from a small hole made in the
downstream end. Care shall be taken in the release of the static head or air
pressure so that a vacuum will not be developed that could damage the pipe or the
newly installed lining. After the tube is cured, a cool down period shall be used
prior to opening the downstream plug and returning normal flow back into the
system.
SEALING AT MANHOLES
A tight seal of the liner at the manhole walls consisting of a resin mixture
compatible with the liner/resin system may be applied in accordance with
manufacturer specifications.
FINISH
The finished CIPP shall be continuous over the entire length of any section
and be as free as commercially practicable from visual defects such as
foreign inclusions, dry spots, pinholes and delamination.
3.05 REINSTATEMENT OF SERVICES
A.
SERVICE CUTS
All live services shall be reinstated as soon as practical after rehabilitation,
testing, and cooling of sewer lines. Inactive services may be left unopened as
directed by the Engineer. It is the Contractor’s responsibility to document all live
services prior to lining. Each service connection shall be noted by its size,
position from a reference manhole, and orientation with respect to the
circumference of the pipe. Reconnection shall be accomplished from the interior
of the sewer line by means of a television camera and a remote controlled cutting
device. Excavation to activate existing sewer services shall not be allowed.
CUTTING AND BRUSHING
Holes cut through the rehabilitation liner shall be done in a two-step process. The
holes shall be first cut open with a router bit or deburring tool, and then brushed
with a wire brush to a neat and smooth surface. Holes shall reopen service lines to
a minimum of ninety (90%) percent of the service lateral. A one-step process that
accomplishes the same effect may be used if approved by the Engineer.
2019 CIPP Lining Project CIPP Lining of Existing Sewers (Hot Water or Steam)
Nashua, NH
02650-10
