Underground Infrastructure - July 2023 - 33

Rehab Technology
and installation regardless of ambient factors since no curing or
bonding is required.
The manufacturing process, available diameters, and termination
fittings are the primary differentiators between the two
currently available products. One option is analogous to loosefit
sliplining in that it does not fit snug against the inside diameter
of the host pipe. This product is manufactured utilizing a
process that glues the three layers together. Assembly via glue
limits the diameter to 20 inches, as the liner would come apart
under its own weight during the installation process if larger
diameters were produced. This product comes standard with a
seamless aramid Kevlar fiber as the inner layer and two layers
are available for higher pressure applications. The use of Kevlar
does come with some restrictions as this FFRP system must
be de-rated for pressure for each bend it navigates. In practice,
however, this is typically not problematic as the original pressure
ratings are sufficiently high enough to negate any de-rating.
The manufacturing process is the primary differentiator between
the two products that are currently available: the alternative
FFRP product consists of a reinforced fabric layer that is
extruded within the inner and outer polymer layers, resulting in
greater tensile strength and far exceeding the 20-inch diameter
limitation. Both systems have a high coefficient of friction of
150 and are considered a class III pipe.
Pull lengths are generally dictated by appurtenances, pulling
equipment capacity and the material characteristics of the selected
liner. In small diameter applications, lengths of up to 8,200
linear feet can be achieved with glued FFRP liners, and up to
13,000 linear feet with the more monolithic liner. The difference
in maximum pull capacity is again a result of the difference in layer
bonding during the manufacturing process of the liners. Another
consideration when planning pull distances is the spools that
are used to transport and store the liners for installation. Larger
pipe diameters can fit smaller lengths of pipe on the transporting
spools to remain maneuverable. FFRP is fabricated round then
flattened, folded, and taped for transportation to jobsite and for
ease of insertion into host pipe. After insertion, air is introduced
into the liner to restore it back to its fully round shape.
Benefits to this method include the following:
* Long segments can be pulled at once and result in zero joints
* Installation is quick when compared to dig and replace
and to other trenchless methods
* Liners easily navigate 45-degree elbows wrinkle-free
* It be used on all types of pipe materials
* Installation is not depended on weather conditions
* No curing is needed
* Minimal diameter reduction (embedded liner even more so)
* Wide range of diameter options
* Requires minimal planning and calculations
* A small construction footprint is required
* A 40 to 50-plus year service life.
The drawbacks to this method include:
* Aggressive cleaning can be required
* CCTV is required to ensure that the host pipe
is properly prepared
UI-Conference.com
UndergroundInfrastructure.com | JULY 2023 33
* All valves and services not only need to be removed and
replaced but cannot be tapped directly back into the liner.
Conclusions
Trenchless technologies for pressure pipes continue to be
favored over remove and replace methods. Overall, in most
cases, a trenchless technology can reestablish the original
life of the pipe, be more cost effective and be ecologically
and socially responsible. Each of the above technologies has
a unique purpose that fits certain situations better than the
other technologies. Considerations that an asset owner must
consider when selecting the appropriate trenchless approach
include flow requirements, pressure needs, pipe classification,
host pipe alignment and features, existing utilities and social/
environmental impact.
Trenchless technology should always be considered as a
method of reestablishing the useful life of a deteriorating pipeline.
Each trenchless method brings with it certain advantages
and disadvantages that must be considered when planning.
However, with the improvements FFRP, it is the opinion of
the author that a high percentage of future applications will
favor this technology. UI
FOR MORE INFORMATION:
CPM Pipelines, (480) 438-1283, cpmpipelines.com
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Underground Infrastructure - July 2023

Table of Contents for the Digital Edition of Underground Infrastructure - July 2023

Underground Infrastructure - July 2023 - 1
Underground Infrastructure - July 2023 - 2
Underground Infrastructure - July 2023 - 3
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