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

Technology/Method Subline/Close Fit PE Liner – Fold -and - Form
maintain the reduced shape through insertion. Insertion lengths of up to 3,500 feet
are possible. The reduced cross-section PE pipe maintains its shape until
subjected to internal water pressure. The internal pressure breaks the restraining
straps and reverts the pipe back to its original diameter and in close contact with
the host pipe. The string of PE pipes can be pulled through a bend of up to 45 o .
Proprietary couplings are then attached to the end of the exposed pipe sections and
make-up pieces are inserted to reconnect the pipe to the existing main.
QA/QC CCTV the line, after cleaning, to make sure there are no impediments to prevent
insertion and reversion of the PE liner. Pressure test after insertion.
IV. Operation and Maintenance Requirements
O&M Needs Not available.
Repair Requirements Not available.
for Rehabilitated
Sections
V. Costs
Key Cost Factors Not available.
Case Study Costs Not available.
References
VI. Data Sources
www.subterra.co.uk, Subline flyer
A-19