Underground Construction - November 2019 - 35

to permit proper installation of the seal. This creates a uniform,
concentric transition between the liner and host pipe.
The elastomeric seal is typically made of EPDM or nitrile rubber,
depending on the application service. The end seal installation is
accomplished using either a self-contained hydraulic hand pump
or a pneumatic packer to expand the stainless-steel sleeve or
retaining bands to achieve the desired pressure and compression.
Once expanded, the retaining bands or sleeve are mechanically
locked into position. Mechanical style end seals also have the
capability of being pressure tested to ensure the compression of
the elastomeric membrane is sufficient to create a watertight seal.
In addition to termination points of all pressure pipe liner
installations, end seals should always be considered when new
connections (valves, tees, hydrants) are made to previously lined
pipe segments. In the unlikely event that a section of lined pipe
is damaged due to construction or maintenance activity, the
damaged pipe section should be removed, end seals installed and
replaced in-kind with a like-diameter spool piece and appropriate
mechanical fittings.

Tapping of lined pipe
With the growing popularity and feasibility of pressure pipe lining
technologies, especially in potable water, industry leaders are
working together to ensure these solutions are able to support future infrastructure growth. Functions such as line stopping, valve
insertion and tapping into or through a lined pipe require careful
consideration of equipment and attention to the process.
Maintaining water tightness at existing services can be
challenging when failure of the host pipe or pressure pipe system
occurs through galvanic corrosion or other means. Demonstration
tests may be coordinated by the lining system manufacturer at
the direction of the utility to simulate site conditions, confirm
predicted performance and establish alternative repair measures
when hydrostatic integrity is lost. This may include connecting a
new service to the existing main by dry or wet tapping into the
lined pipe or replacing the service in-kind.
Lining system manufacturers should be consulted to provide
guidance to utility maintenance and operation departments on
maintaining water tightness and reconnection when lined pipe is
penetrated, removed or replaced. Tapping of a lined pipe should
follow published guidelines from the lining system manufacturer.
Methods and equipment for tapping lined pipe should be proven
through relevant demonstration testing to the utility that simulate
installation conditions.
This article starts the necessary conversation between utilities
and those presenting lining for the renewal of pressure pipes.
Although the need should be obvious, many times the requirements for ongoing maintenance and operation of lined systems is
not addressed when the rehabilitation is chosen or made.
The long-term success for linings used to renew pressure pipes
relies heavily on implementing operation and maintenance
activities required to preserve the new pipe material (lining) and
optimize system performance. Responsible lining system providers
and manufacturers should provide published guidelines detailing
the care and maintenance of the installed systems. *

REHABNEWS
Perma-Liner Rolls Out Road Shows,
New Product for Tackling Infrastructure Rehab
permaliner.com
With aging infrastructure and broken sewer lines being common themes that
more and more communities are experiencing, Perma-Liner Industries LLC
hosted events to share innovative, trenchless technology, and state-of-the-art
equipment and materials to tackle these issues in the least disruptive manner.
At a one-day event in Fort Wayne, Ind., and three-day showcase
in Clearwater, Fla., company professionals provided information and
demonstrations on Perma-Liner's pioneering experience in designing, patenting
and manufacturing CIPP solutions that cost-effectively repair - without
excavation - existing sewer systems. The sessions also gave attendees the
opportunity to interact with Perma-Liner personnel, materials and equipment.
The company also introduced its newest product, a first-of-its-kind, wetout table. The portable wet-out table is extremely simple to use with models
capable for 110V and 230V power. Versatility is critical in most projects and
this new equipment allows installers to move as close to their repair location
as possible. It also features a foot pedal that can be switched off, an adjustable
roller speed and direction, and a removable control box with a 5-foot cable to
provide the installer with more options when using the equipment.
"Perma-Liner's new wet-out roller takes power, precision and portability
to another level in the small-diameter CIPP marketplace," said Joel Siperek,
sales manager.
Based in Clearwater, Fla., Perma-Liner is a leading manufacturer and supplier
of trenchless pipeline rehabilitation equipment and materials in North America,
and a premier brand of Waterline Renewal Technologies (WRT). *

FOR MORE INFORMATION:
NASSCO, (410) 442-7473, nassco.org
UConOnline.com | NOVEMBER 2019

35


http://www.permaliner.com http://www.nassco.org http://www.UConOnline.com

Underground Construction - November 2019

Table of Contents for the Digital Edition of Underground Construction - November 2019

Contents
Underground Construction - November 2019 - FC
Underground Construction - November 2019 - IFC
Underground Construction - November 2019 - Contents
Underground Construction - November 2019 - 4
Underground Construction - November 2019 - 5
Underground Construction - November 2019 - 6
Underground Construction - November 2019 - 7
Underground Construction - November 2019 - 8
Underground Construction - November 2019 - 9
Underground Construction - November 2019 - 10
Underground Construction - November 2019 - 11
Underground Construction - November 2019 - 12
Underground Construction - November 2019 - 13
Underground Construction - November 2019 - 14
Underground Construction - November 2019 - 15
Underground Construction - November 2019 - 16
Underground Construction - November 2019 - 17
Underground Construction - November 2019 - 18
Underground Construction - November 2019 - 19
Underground Construction - November 2019 - 20
Underground Construction - November 2019 - 21
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Underground Construction - November 2019 - 50
Underground Construction - November 2019 - IBC
Underground Construction - November 2019 - BC
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