Underground Infrastructure - July 2023 - 39

Rehab Technology
and Insituform was executed on Oct. 31,
2018, just two short months after the leak
was first discovered. From the Notice-toProceed
date in October, the CIPP liner
was manufactured, delivered, installed
and pressure tested all by Dec. 14, 2018.
To achieve a fully structural Class IV
solution, the CIPP solution needed to
be properly designed and manufactured
to meet the operating conditions of the
pipeline from internal pressures and external
loading. However, one key aspect
to providing a fully structural Class IV
solution is to appropriately terminate the
liner. This is achieved by terminating the
liner into a new end spool piece, where
an internal end seal is then installed.
Terminating outside the limits of the
existing pipe eliminates reliance on the
existing deteriorating host pipe for future
service life. When this same termination
detail is provided on the other end of the
segment to be rehabilitated, standard pipe
closure spools and fittings can be installed
to reconnect to the existing pipeline prior
to backfilling and restoration of the site.
After the CIPP repair was installed, the
owner was then able to inspect the remaining
force main length to determine the
best path forward for future restoration
techniques. Using both the PipeDiver
and SmartBall by Pure Technologies, the
owner was able to collect valuable data on
the existing condition of the pipeline to
make an informed decision on the best-fit
rehabilitation solution.
The condition assessment tools provided
results that showed several air and
gas pockets, and areas where there was
substantial pipe wall loss. These results
allowed the owner to plan and design
the proper improvements to the system
by adding new ARVs in strategic
locations and identifying candidates for
rehabilitation.
Discovering a leak is never the preferred
way of finding out that rehabilitation
or repair of a pipeline is necessary.
However, the emergency repair and subsequent
inspection of this project showcased
the versatility and adaptability of
the trenchless rehabilitation industry.
The industry is technology-based and always
working to provide better tools and
solutions to address the increasing need
for innovative, cost-effective equipment
to address aging infrastructure.
With an entire industry dedicated to
solving problems that impact every community
and a network of owners and engineers
matching the available solutions
to the problems, we rely on the collaborative
approach to find the best fit solution
to maintain our critical water and wastewater
infrastructure. UI
ABOUT THE AUTHORS: Tim Peterie
is the Insituform business development
manager for North Texas, Oklahoma and
Arkansas. Steve Soldati, P.E. is the regional
sales manager of pressure pipe for the Eastern
United States for Aegion Corporation.
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UndergroundInfrastructure.com | JULY 2023 39
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Underground Infrastructure - July 2023

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