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

Technology/Method Subcoil/Close Fit PE Liner – Fold -and - Form
I. Technology Background
Status Emerging
Date of Introduction Not available.
Utilization Rates Not available.
Vendor Name(s) Subcoil
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
Subcoil is a close fit polyethylene lining that is factory folded and held in a “C”
shape. Subcoil arrives on a large spool. After insertion, the liner is pressurized
with water at ambient temperature breaking the temporary bands and reverting the
pipe back to its original dimensions and forming a close fit with the host pipe.
Main Benefits Claimed • Negotiate bends up to 22.5 o
• Designed to be a thin wall liner that bridges over holes and gaps preventing
leakage
• Stops internal corrosion
• Minimal lost 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)
• Proprietary end fittings needed to join the liner up to the existing main
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 using proprietary fittings
Structural Rating Semi-Structural (II)
Claimed
Materials of Composition PE 80
Diameter Range, inches 4-12 inches (95-300mm)
Thickness Range, inches Not available.
Pressure Capacity, psi Depends on size of hole being bridged
Temperature Range, o F 73 o F (pressure derating required at higher temperatures)
Renewal Length, feet 3,500 feet (1,000 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. The spool of PE is pulled through the host
pipe. 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 22.5 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.
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