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

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