State of Technology Report for Force Main Rehabilitation, Final ...

Technology/Method CIPP/Direct Inversion/Pull -in - Place/Hot Water and Steam Cured
air. The pressure required to properly expand the tube to the host pipe is given
by the tube manufacturer. Once in place the liner is cured by heating the water
or air up to the temperature required to initiate polymerization of the resin
system.
QA/QC The host pipe is cleaned and CCTV used prior to installation of the liner. Any
changes in dimensions or offsets can be accommodated in the design of the liner
so best if this is done well in advance of the planned installation. Samples of the
cured liner are taken per 8.1.1 or 8.1.2 of ASTM F1216. In addition to
dimensional checks of the liner samples (outside diameter, wall thickness),
flexural properties (ASTM D790) and tensile properties (ASTM D638) are also
determined.
IV. Operation and Maintenance Requirements
O&M Needs The condition of the CIPP should be monitored and maintained on a routine
basis consistent with that of other piping in the system. The conditions should be
coded per a standardized methodology. Should a defect appear requiring repairs;
those repairs should be as warranted by the type of defect discovered using the
Repair Requirements
for Rehabilitated
Sections
techniques available for those type of repairs.
For restoration of water-tightness to the CIPP wall where damage has occurred
or a defect identified; install a part-liner.
Where delamination of the PU coating occurs (quite rare); mill off the detached
portion of the coating.
V. Costs
Key Cost Factors CIPP costs are driven by length of reaches that can be done in a single
installation, diameter and thickness of the liners to be installed (material costs),
and contractor efficiency. Regarding contractor efficiency, there are two
components to consider; mobilization costs and project management skills.
Case Study Costs Not available.
VI. Data Sources
References www.nationalliner.com; Email correspondence with R. Pavlic
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