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No-dig pipe replacement solutions
First introduced nearly 50 years ago,
no-dig or trenchless installation
technology is well established and
has gained popularity in buried
infrastructure rehabilitation or
replacement as it is a cost-effective
way of replacing pipelines located
within congested urban areas, causing
less disruption to traffic, residents
and the environment. In addition,
pipe replacement can generally be
completed far more quickly than open-
cut operations. The range of techniques
continues to grow, with developments
bringing smart pipe lining systems
for pipeline rehabilitation. They are SERVIFLEX mains to meter service pipe rehabilitation
®
especially vital when old pipelines
run under historic structures, golf
courses, lakes, protected woodlands or
environmentally sensitive areas.
Radius Subterra offers two
specialist and unique close-fit pipe
lining technologies using PE pipes.
Specifically engineered to protect and
treat both corrosion and structural
damage, these specialist techniques
have been developed to address the key
issues experienced when replacing and
maintaining pipeline infrastructure.
TM
1. Subline DR -
Diameter reduced PE liners
Thick-walled and fully pressure rated,
this concentric reduction pipe lining
system and process is ideal for the
rehabilitation of structurally weakened SUBLINE DR – CLOSE-FIT STRUCTUAL DIAMETER REDUCED PE LINER SUBLINE PF – CLOSE-FIT SITE FOLDED INTERACTIVE PE LINER
or corroded pipelines and mains. This
technology uses standard PE pipe that structural solution for the renovation they run under and inside properties.
is butt-fusion welded into appropriate of pipelines. Thin-walled polyethylene Traditional open cut installation
lengths, and pushed through roller sets pipe is welded on site into long lengths methods can be very disruptive and
to reduce its diameter concentrically by and pushed through a former that flow stop operations are required to
approximately 10 per cent. This reduced folds the liner pipe into a compact interrupt the gas supply while the
diameter liner pipe is stable without cross section. The folded pipe is then works are carried out.
the application of tension and can be strapped with temporary bands and Developments of flexible gas service
inserted into the host pipeline using inserted into the host pipeline using pipes, installed using the no-dig
conventional sliplining techniques. This standard slip-lining techniques. Once insertion technique have made it easier
technique removes the need for high installed, the folded pipe is pressurised, and less costly to restore the integrity
winching loads and therefore greatly allowing it to revert back to its original and leak-tightness of gas service pipes.
reduces the stresses on the plastic pipe shape. This retains the pipe capacity Radius Systems’ ServiFlex® is the only
and butt welds. Once installed, the pipe and forms a continuous, pressure-tight no-dig pipe relining solution currently
is pressurised using cold water to revert close-fit lining within the host pipe. available on the market, simplifying
it back towards its original diameter, the replacement of 1” services. It is
retaining capacity and forming a close fit ServiFlex® - bringing down the stumbling easy to install, the flexible pipe can
within the host pipe. blocks of mains to meter service pipe navigate short radius bends during
TM
2. Subline PF - Site folded PE liners replacement relining operations, excavations are
Suitable for the renovation and When a mains pipe needs replacing, kept to a minimum and the gas supply
protection of steel, ductile iron, cast service pipes connected to the main are is restored within two hours, with
iron, asbestos cement and other notoriously challenging to restore as very little disruption to residents and
pipelines to prevent corrosion and their layout can be complex, the pipe businesses. ServiFlex® is now available
seal cracks or leaks. Subline PF thin- often includes bends, they are installed in a kit format for connection to the
walled, close-fit polyethylene lining outside a property under footpaths and meter inside the property and to the gas
technologies offer an interactive, semi gardens and are difficult to access as mains outside the property.

FOR MORE INFORMATION ON OUR GA S PIPE SOLUTIONS, PLEA SE C ONTA CT US:
T: +44 (0)1773 811112, E: S ALE S@RADIUS -S Y STEMS. C OM
W W W .RADIUS -S Y STEMS. C OM, W W W .RADIUS -SUBTERRA . C OM

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