State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
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<strong>Technology</strong>/Method Rolldown/Close Fit PE Liner – Symmetrical Reduction<br />
I. <strong>Technology</strong> Background<br />
Status Emerging<br />
Date <strong>of</strong> Introduction Not available.<br />
Utilization Rates Not available.<br />
Vendor Name(s) Rolldown<br />
Subterra<br />
Daniels Contractors Ltd<br />
Lyncastle Way<br />
Appleton Thorn<br />
Warrington WA4 4ST<br />
UK<br />
Phone: +44 (0)1925 860666<br />
Email: info@subterra.co.uk<br />
Web: www.subterra.co.uk<br />
Practitioner(s) Not available.<br />
Description <strong>of</strong> <strong>Main</strong><br />
Features<br />
Rolldown is a close fit polyethylene lining. Standard grade (PE80) PE is pushed<br />
through a series <strong>of</strong> concentric rollers reducing the diameter to facilitate placement<br />
inside a deteriorated host pipe. After insertion, the liner is pressurized with water<br />
at ambient temperature to revert to its original size.<br />
<strong>Main</strong> Benefits Claimed • Negotiate bends up to 11.25 o<br />
• Designed to be fully structural (full pressure) or just a thin wall liner that<br />
bridges over holes and gaps<br />
• PE holds its reduced diameter indefinitely prior to reversion, allows<br />
stop/start internal corrosion<br />
• Minimal loss <strong>of</strong> cross-sectional area and there<strong>for</strong>e capacity<br />
<strong>Main</strong> Limitations Cited • Custom extruded PE with OD to match host pipe ID<br />
Applicability<br />
(Underline those that<br />
apply)<br />
<strong>Force</strong> <strong>Main</strong> Gravity Sewer Laterals Manholes Appurtenances Water<br />
<strong>Main</strong> Service Lines Other: Gas transmission and distribution<br />
II. <strong>Technology</strong> Parameters<br />
Service Application Water Supply and Distribution, Sewer Pumping <strong>Main</strong>s<br />
Service Connections Reinstate via excavation<br />
Structural Rating Claimed Fully structural (IV) or Semi-Structural (II)<br />
Materials <strong>of</strong> Composition PE 80<br />
Diameter Range, inches 4-20 inches (100-500mm)<br />
Thickness Range, inches Not available.<br />
Pressure Capacity, psi 232 psi (16 bar)<br />
Temperature Range, o F 73 o F (pressure derating required at higher temperatures)<br />
Renewal Length, feet 5,000 feet (1,500 meters) in one insertion<br />
Other Notes Not available.<br />
III. <strong>Technology</strong> Design, Installation, and QA/QC In<strong>for</strong>mation<br />
Product Standards NSF 61 Certified (<strong>for</strong> potable water applications)<br />
Design Standards Not available.<br />
Design Life Range 50 years<br />
Installation Standards Not available.<br />
Installation Methodology PE pipe is custom extruded with OD matching ID <strong>of</strong> host pipe. The host pipe is<br />
cleaned, removing any internal corrosion or deposits. The integrity <strong>of</strong> the host<br />
pipe should be checked via CCTV. At site, the string <strong>of</strong> PE pipe is butt-fused<br />
together and then pushed through a series <strong>of</strong> concentric rollers, which reduces the<br />
diameter <strong>of</strong> the liner pipe allowing it to be pulled through the host pipe. Insertion<br />
lengths <strong>of</strong> up to 5,000 feet are possible. The reduced diameter PE pipe maintains<br />
its diameter until subjected to internal water pressure. The internal pressure<br />
reverts the pipe back to its original diameter and in close contact with the host<br />
pipe. The string <strong>of</strong> PE pipes can be pulled through a bend <strong>of</strong> up to 11.25 o .<br />
Standard couplings are then attached to the end <strong>of</strong> the exposed pipe sections and<br />
make-up pieces are inserted to reconnect the pipe to the existing main.<br />
A-12