Underground Construction - July 2021 - 44

REHABTECHNOLOGY
Hobas Pipe Proves Good Fit for Providence Water Sliplining
Since a 1996 rupture of a 102-inch-diameter pipe raised concerns about the structural
integrity of a 9.5-mile aqueduct supplying water to about 600,000 customers in Rhode Island,
Providence Water has embarked on a systematic and comprehensive inspection, repair, and
risk assessment program.
Over the years, the utility company has made numerous repairs and has been on the forefront
of using different technologies and methods. The latest is sliplining with Hobas pipe.
According to Matthew Gallant, P.E., engineering division manager at Providence Water, it was
" a solution that allowed us to make needed repairs but also start incrementally replacing the
existing pipeline, which is now over 50 years old, with a fully structural pipe that didn't
compromise hydraulics. It was also more cost-effective and expedient ... than some of the
methods we previously used. "
Produced using centrifugally cast fiberglass reinforced polymer wall construction with
the typical polyester liner layer and epoxy resin coating on the final interior surface, the
high-strength structural pipe proved to be a good choice.
" Hobas pipe is a good fit because of its strength, integrity, and ease of use, " said Andy Greenlaw,
executive from the contractor on the project. " It has given us the ability to actually navigate
curved pipe sections, which has been critical to accomplishing the work. "
It was also a good choice because it does not depend on the host pipe.
" One of the major considerations in designing the Hobas slipliner was coming up with the
right size pipe that was an acceptable reduction in diameter that could maintain the same
hydraulic capacity of the existing pipelines, " Gallant said. " The smoother interior surface of
the Hobas pipe, as opposed to the rougher concrete of the existing PCCP host pipe, allowed
the same hydraulic capacity to be maintained. "
FOR MORE INFORMATION
Hobas Pipe USA, (800) 856-7473, hobaspipe.com
Quadex Structure Guard
Passes Greenbook Testing,
Earns Approval
Vortex Companies LLC's workhorse epoxy
coating, Structure Guard, has passed the critical
chemical resistance ( " pickle-jar " ) testing, as
required by the city of Los Angeles Department
of Public Works, in accordance with Greenbook
section SSPWC 211-2.
By meeting or exceeding the specifications
for epoxy liners (SSPWC Section 500-2.8.5), the
city has formally approved Structure Guard for
use in sewer rehabilitation applications.
Over the last few years, Vortex's Quadex
Repair Materials product line has expanded, and
the product development team has diligently
worked with third-party testing laboratories, as
well as the city of LA's Bureau of Engineering,
to demonstrate the performance of Structure
Guard in highly corrosive sewer environments.
To date, more than 200 other cities, counties,
and agencies have adopted the City of LA
Greenbook Standard as their own standard for
public works construction specifications.
The " pickle-jar " test is viewed as the ultimate
challenge to a product's ability to withstand
the most extreme chemically corrosive
environments. With this acceptance, Structure
Guard, a 100-percent solids epoxy coating is
approved for application to brick, concrete and
mortar surfaces typically found in underground
sewer infrastructure.
" Structure Guard is one of only a handful
of protective epoxy coating products to be
approved for application on such a broad range
of substrates, " added Brocklyn Stone, senior
product manager.
Vortex Companies delivers advanced
trenchless technologies and turnkey services
to cost-effectively renew municipal, industrial,
and commercial infrastructure. Vortex Products
division, develops and sells manhole and pipe
rehabilitation materials, polymeric coatings and
resins, sewer robot systems, rehab equipment,
sensor technology and high-speed drain
cleaning tools. Vortex Services division provides
lining and coating solutions, pipe bursting,
CCTV, and inspection.
FOR MORE INFORMATION
Vortex Companies, (713) 750-9081,
vortexcompanies.com
44 JULY 2021 | UCONonline.com

http://www.hobaspipe.com http://www.vortexcompanies.com http://www.UCONonline.com

Underground Construction - July 2021

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